SlideShare ist ein Scribd-Unternehmen logo
1 von 22
Downloaden Sie, um offline zu lesen
Operative/Single
Crown
Nourelhoda
324-350
From page 325-330
 Page 329:
6-Which of the following materials are LEAST
suitable for impressions for cast gold
restorations?
A. Polysulfides.
B. Polyvinyl siloxanes.
C. Polyethers.
D. Irreversible hydrocolloids
Non aqueous
elastomeric material
aqueous elastomeric
material
Answer:
Therefore, alginate is an acceptable
impression material for study models, but it
is an unacceptable impression material for
the fabrication of bridges, crowns, and inlays.
Nearly all impression materials are acceptable
for full-denture impressions.
Clinical aspect of dental material chapter 8 page 117
The disadvantage of the material being predominantly water is that
water evaporates
from the surface of the impression if it is left
exposed to air. When the water evaporates,
the impression shrinks and is no longer
accurate
Hydrocolloid materials contract slightly
after setting and exude water. This process
is called syneresis. Syneresis occurs very
slowly, but it is a second reason to pour
hydrocolloid impressions as soon as possible
When disinfecting a hydrocolloid impression,
however, it is important to limit the
time that the impression is exposed to an
aqueous disinfecting solution. The hydrocolloid
will absorb water, swell, and distort.
This is called imbibition.
7-In metal-ceramic crowns, the bond between the
materials is
A. mainly mechanical.
B. mainly chemical.
C. decreased by oxides on the metal surface.
D. decreased when the metal has a high yield point.
Introduction to metal ceramic restoration page 83
8-Nickel-chromium alloys designed for porcelain
bonded to metal crowns should be used with
caution because
A. nickel is an allergen.
B. the modulus of elasticity is low.
C. these alloys cannot be soldered.
D. None of the above.
Introduction to metal ceramic restoration page 35
9-For application of porcelain to a ceramo-metal
alloy, the correct viscosity is achieved by
mixing the porcelain powder with
A. a porcelain modifier.
B. pure methyl alcohol.
C. a mild detergent.
D. distilled water
Introduction to metal ceramic restoration page
17
Page 330
1-A model prepared from a vacuum mixed stone
has higher strength because
A. less water is required for vacuum mixing.
B. there is less porosity.
C. some of the water is removed by the vacuum.
D. the nuclei for crystallization are more numerous.
 Stone is made from gypsum by carefully controlled
calcination under steam pressure in a closed
container. This method of calcination slowly releases
the water of crystallization from the crystal so that the
resultant powder particle (Fig. 9.4B)is more
regular, more uniform in shape, and less porous
compared to that of plaster.
 Stone is stronger and more expensive than plaster. It is
used mainly in making casts for diagnostic purposes
and casts for complete and partial denture
construction, which require greater strength and
surface hardness than that of plaster
 The dense particles of stone require less gauging
water to float them, and their regular shape allows
them to roll over one another more easily.
 This difference in the amount of measured water that
is required to make a workable mix results in different
consistencies for the products when first mixed at the
proper water/powder ratio. Plaster is usually thin in
consistency, like a ‘smoothie,’ whereas improved
stone is like thick cake batter. Dental stone has an
intermediate consistency. The water/powder ratio has
a direct effect on the properties of each gypsum
product and must be controlled for optimum
 The strength depends on the porosity of the set
material, and the porosity relates to the water/powder
ratio necessary to make a workable mix. Plaster,which
requires the most gauging water to make a fluid mix, is
the weakest in strength, with improved stone being
the strongest and stone being intermediate between
the two.
 Table 9.1 One-Hour Compressive Strengths and
Water/Powder Ratios of Gypsum Products
 Minimum 1-Hour Compressive
 Gypsum Strength (lb/in2 [Mpa])a Water/Powder
Ratiob
 Plaster (Type II) 1,300 (9) 45–50 ml/100 g (0.45–0.50)
 Dental stone (Type III) 3,000 (21) 28–30 ml/100 g (0.28–
0.30)
 Dental stone, high-strength (Type IV) 5,000 (34) 19–24
ml/100 g (0.19–0.24)
 Clinical aspect of dental material chapter 9 page 132
2-Impression trays should be
A. rigid.
B. flexible enough to permit easy insertion.
C. carefully polished on the interior.
D. held in place by the patient.
 With any system, tray rigidity is important, because
even slight flexing of the tray will lead to a distorted
impression. This is particularly frustrating because the
errors are usually undetectable until the practitioner
attempts to seat the restoration.
 For this reason, thin, disposable plastic trays are
unacceptable . Resin thicknesses of 2 to 3 mm are
needed for adequate rigidity. Clearance between
the tray and the teeth should also be 2 to 3 mm;
however, greater clearance is necessary for the more
rigid polyether Materials.
Contempory fixed prosthesis section II page 365
3-A ceramometal posterior fixed partial denture
pontic should ???
A. A. be constructed to have an occlusal surface one
quarter the width of the tooth it replaces.
B. be constructed to have an occlusal surface wider
than the width of the tooth it replaces.
C. cover as much mucosa as possible.
D. provide adequate embrasure spaces.

Weitere ähnliche Inhalte

Was ist angesagt?

Endodontic sealers or Root Canal sealers
Endodontic sealers or Root Canal sealersEndodontic sealers or Root Canal sealers
Endodontic sealers or Root Canal sealerssurabhisoumya1
 
root canal sealers dr jagadeesh kodityala
 root canal sealers dr jagadeesh kodityala root canal sealers dr jagadeesh kodityala
root canal sealers dr jagadeesh kodityalaJagadeesh Kodityala
 
Techniques of direct composite restoration
Techniques of direct composite restorationTechniques of direct composite restoration
Techniques of direct composite restorationMrinaliniDr
 
Cavity liners and_bases_2
Cavity liners and_bases_2Cavity liners and_bases_2
Cavity liners and_bases_2Dinesh Khatri
 
CONTROVERSIES IN IRRIGATION #
CONTROVERSIES IN IRRIGATION #CONTROVERSIES IN IRRIGATION #
CONTROVERSIES IN IRRIGATION #JAMES RAJAN
 
Dental bases and liners
Dental bases and linersDental bases and liners
Dental bases and linersIAU Dent
 
How to select restorative materials
How to select restorative materialsHow to select restorative materials
How to select restorative materialsSaeed Bajafar
 
Dentin bonding agents
Dentin bonding agentsDentin bonding agents
Dentin bonding agentsSk Aziz Ikbal
 
Indirect Posterior Adhesive Restoration: Criteria to Success
Indirect Posterior Adhesive Restoration: Criteria to SuccessIndirect Posterior Adhesive Restoration: Criteria to Success
Indirect Posterior Adhesive Restoration: Criteria to Successasclepiuspdfs
 
Resin based obturation / /certified fixed orthodontic courses by Indian den...
Resin based obturation   / /certified fixed orthodontic courses by Indian den...Resin based obturation   / /certified fixed orthodontic courses by Indian den...
Resin based obturation / /certified fixed orthodontic courses by Indian den...Indian dental academy
 
Luting agents and cementation
Luting agents and cementation Luting agents and cementation
Luting agents and cementation Cing Sian Dal
 
root canal sealers
root canal sealersroot canal sealers
root canal sealersSai D
 
Dental luting cements/ colleges for dentistry
Dental luting cements/ colleges for dentistryDental luting cements/ colleges for dentistry
Dental luting cements/ colleges for dentistryIndian dental academy
 
Die materials and die systems
Die materials and die systemsDie materials and die systems
Die materials and die systemssmidsprostho
 
Root canal sealers /endodontic courses
Root canal sealers /endodontic coursesRoot canal sealers /endodontic courses
Root canal sealers /endodontic coursesIndian dental academy
 
Finals lecture- direct composite & history
Finals lecture- direct composite & historyFinals lecture- direct composite & history
Finals lecture- direct composite & historyEmjei Mendoza
 

Was ist angesagt? (20)

Endodontic sealers or Root Canal sealers
Endodontic sealers or Root Canal sealersEndodontic sealers or Root Canal sealers
Endodontic sealers or Root Canal sealers
 
Root Canal Sealers
Root Canal SealersRoot Canal Sealers
Root Canal Sealers
 
root canal sealers dr jagadeesh kodityala
 root canal sealers dr jagadeesh kodityala root canal sealers dr jagadeesh kodityala
root canal sealers dr jagadeesh kodityala
 
Techniques of direct composite restoration
Techniques of direct composite restorationTechniques of direct composite restoration
Techniques of direct composite restoration
 
Cavity liners and_bases_2
Cavity liners and_bases_2Cavity liners and_bases_2
Cavity liners and_bases_2
 
CONTROVERSIES IN IRRIGATION #
CONTROVERSIES IN IRRIGATION #CONTROVERSIES IN IRRIGATION #
CONTROVERSIES IN IRRIGATION #
 
Dental bases and liners
Dental bases and linersDental bases and liners
Dental bases and liners
 
How to select restorative materials
How to select restorative materialsHow to select restorative materials
How to select restorative materials
 
Resin luting cements (Word)
Resin luting cements (Word)Resin luting cements (Word)
Resin luting cements (Word)
 
Dentin bonding agents
Dentin bonding agentsDentin bonding agents
Dentin bonding agents
 
Indirect Posterior Adhesive Restoration: Criteria to Success
Indirect Posterior Adhesive Restoration: Criteria to SuccessIndirect Posterior Adhesive Restoration: Criteria to Success
Indirect Posterior Adhesive Restoration: Criteria to Success
 
Resin based obturation / /certified fixed orthodontic courses by Indian den...
Resin based obturation   / /certified fixed orthodontic courses by Indian den...Resin based obturation   / /certified fixed orthodontic courses by Indian den...
Resin based obturation / /certified fixed orthodontic courses by Indian den...
 
Luting agents and cementation
Luting agents and cementation Luting agents and cementation
Luting agents and cementation
 
Bonding (2)
Bonding (2)Bonding (2)
Bonding (2)
 
root canal sealers
root canal sealersroot canal sealers
root canal sealers
 
Dental luting cements/ colleges for dentistry
Dental luting cements/ colleges for dentistryDental luting cements/ colleges for dentistry
Dental luting cements/ colleges for dentistry
 
Resin Luting cements (2nd edition)
Resin Luting cements (2nd edition) Resin Luting cements (2nd edition)
Resin Luting cements (2nd edition)
 
Die materials and die systems
Die materials and die systemsDie materials and die systems
Die materials and die systems
 
Root canal sealers /endodontic courses
Root canal sealers /endodontic coursesRoot canal sealers /endodontic courses
Root canal sealers /endodontic courses
 
Finals lecture- direct composite & history
Finals lecture- direct composite & historyFinals lecture- direct composite & history
Finals lecture- direct composite & history
 

Ähnlich wie Operative and crown questions

Model plaster
Model plasterModel plaster
Model plasterIAU Dent
 
IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...
IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...
IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...IRJET Journal
 
Study on Properties of Self Compacting Concrete with Glass Powder and Steel Slag
Study on Properties of Self Compacting Concrete with Glass Powder and Steel SlagStudy on Properties of Self Compacting Concrete with Glass Powder and Steel Slag
Study on Properties of Self Compacting Concrete with Glass Powder and Steel Slagijtsrd
 
Model and dies
Model and diesModel and dies
Model and diesDR PAAVANA
 
IRJET- Partial Replacement of Perlite Powder with Cement in Concrete
IRJET-  	  Partial Replacement of Perlite Powder with Cement in ConcreteIRJET-  	  Partial Replacement of Perlite Powder with Cement in Concrete
IRJET- Partial Replacement of Perlite Powder with Cement in ConcreteIRJET Journal
 
Iaetsd innovative brick material
Iaetsd innovative brick materialIaetsd innovative brick material
Iaetsd innovative brick materialIaetsd Iaetsd
 
Partial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate byPartial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate byeSAT Publishing House
 
Partial replacement of cement and fine aggregate by using fly ash and glass a...
Partial replacement of cement and fine aggregate by using fly ash and glass a...Partial replacement of cement and fine aggregate by using fly ash and glass a...
Partial replacement of cement and fine aggregate by using fly ash and glass a...eSAT Journals
 
Partial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate byPartial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate byeSAT Publishing House
 
ZZB1469 Glass Pearl Media brochure 82516
ZZB1469 Glass Pearl Media brochure 82516ZZB1469 Glass Pearl Media brochure 82516
ZZB1469 Glass Pearl Media brochure 82516Kristina Macias
 
Positive potential of partial replacement of fine aggregates by waste glass 6...
Positive potential of partial replacement of fine aggregates by waste glass 6...Positive potential of partial replacement of fine aggregates by waste glass 6...
Positive potential of partial replacement of fine aggregates by waste glass 6...IAEME Publication
 
1 effect of glass on strength of concrete subjected
1 effect of glass on strength of concrete subjected1 effect of glass on strength of concrete subjected
1 effect of glass on strength of concrete subjectedprjpublications
 
Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...
Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...
Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...IRJET Journal
 
Die &Die Materials.pptx
Die &Die Materials.pptxDie &Die Materials.pptx
Die &Die Materials.pptxBaishali Ghosh
 
Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...
Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...
Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...idescitation
 
INVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETE
INVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETEINVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETE
INVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETEIRJET Journal
 
GIC material aspect
GIC material aspectGIC material aspect
GIC material aspectSAGAR HIWALE
 
Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...
Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...
Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...IRJET Journal
 

Ähnlich wie Operative and crown questions (20)

Model plaster
Model plasterModel plaster
Model plaster
 
IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...
IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...
IRJET- Durability Study on Behaviour of Integral Crystalline Water Proofing C...
 
Study on Properties of Self Compacting Concrete with Glass Powder and Steel Slag
Study on Properties of Self Compacting Concrete with Glass Powder and Steel SlagStudy on Properties of Self Compacting Concrete with Glass Powder and Steel Slag
Study on Properties of Self Compacting Concrete with Glass Powder and Steel Slag
 
Model and dies
Model and diesModel and dies
Model and dies
 
IRJET- Partial Replacement of Perlite Powder with Cement in Concrete
IRJET-  	  Partial Replacement of Perlite Powder with Cement in ConcreteIRJET-  	  Partial Replacement of Perlite Powder with Cement in Concrete
IRJET- Partial Replacement of Perlite Powder with Cement in Concrete
 
Colloidal Silica
Colloidal  SilicaColloidal  Silica
Colloidal Silica
 
Iaetsd innovative brick material
Iaetsd innovative brick materialIaetsd innovative brick material
Iaetsd innovative brick material
 
Partial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate byPartial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate by
 
Partial replacement of cement and fine aggregate by using fly ash and glass a...
Partial replacement of cement and fine aggregate by using fly ash and glass a...Partial replacement of cement and fine aggregate by using fly ash and glass a...
Partial replacement of cement and fine aggregate by using fly ash and glass a...
 
Partial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate byPartial replacement of cement and fine aggregate by
Partial replacement of cement and fine aggregate by
 
ZZB1469 Glass Pearl Media brochure 82516
ZZB1469 Glass Pearl Media brochure 82516ZZB1469 Glass Pearl Media brochure 82516
ZZB1469 Glass Pearl Media brochure 82516
 
Positive potential of partial replacement of fine aggregates by waste glass 6...
Positive potential of partial replacement of fine aggregates by waste glass 6...Positive potential of partial replacement of fine aggregates by waste glass 6...
Positive potential of partial replacement of fine aggregates by waste glass 6...
 
1 effect of glass on strength of concrete subjected
1 effect of glass on strength of concrete subjected1 effect of glass on strength of concrete subjected
1 effect of glass on strength of concrete subjected
 
Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...
Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...
Variation of Sorptivity in Diverse Grades of Concrete Proportioned with Fly A...
 
Die &Die Materials.pptx
Die &Die Materials.pptxDie &Die Materials.pptx
Die &Die Materials.pptx
 
Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...
Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...
Effects of Silica Fume and Fly Ash as Partial Replacement of Cement on Water ...
 
INVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETE
INVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETEINVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETE
INVESTIGATION ON EFFECT OF WATER HYACINTH IN CONCRETE
 
GIC material aspect
GIC material aspectGIC material aspect
GIC material aspect
 
Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...
Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...
Experimental Study on Strength of Concrete using Crushed Pebbles by Replaceme...
 
My ppt
My pptMy ppt
My ppt
 

Mehr von Rosa Martinez

Mohamed oral anesthesia
Mohamed oral anesthesiaMohamed oral anesthesia
Mohamed oral anesthesiaRosa Martinez
 
Maria's Oral med + oral patho + radio
Maria's Oral med + oral patho + radioMaria's Oral med + oral patho + radio
Maria's Oral med + oral patho + radioRosa Martinez
 
Mohamed's oral pathology,medicine and radiography
Mohamed's oral pathology,medicine and radiographyMohamed's oral pathology,medicine and radiography
Mohamed's oral pathology,medicine and radiographyRosa Martinez
 
Endo case studies answers
Endo case studies answersEndo case studies answers
Endo case studies answersRosa Martinez
 
Endodontics study cases
Endodontics study casesEndodontics study cases
Endodontics study casesRosa Martinez
 
Periodontics case studies answers
Periodontics case studies answersPeriodontics case studies answers
Periodontics case studies answersRosa Martinez
 
Periodontology: Mohamed Zeina
Periodontology: Mohamed ZeinaPeriodontology: Mohamed Zeina
Periodontology: Mohamed ZeinaRosa Martinez
 
Periodontics case studies
Periodontics case studiesPeriodontics case studies
Periodontics case studiesRosa Martinez
 
Pediatric case studies
Pediatric case studiesPediatric case studies
Pediatric case studiesRosa Martinez
 
Orthodontics dhenelyn
Orthodontics dhenelynOrthodontics dhenelyn
Orthodontics dhenelynRosa Martinez
 
Study group readiness training wrap up
Study group readiness training wrap upStudy group readiness training wrap up
Study group readiness training wrap upRosa Martinez
 
Orthodontics june 26
Orthodontics june 26Orthodontics june 26
Orthodontics june 26Rosa Martinez
 
Study Group Readiness: IT Learning Tools
Study Group Readiness: IT Learning ToolsStudy Group Readiness: IT Learning Tools
Study Group Readiness: IT Learning ToolsRosa Martinez
 
Study Group Readiness: Learning Approaches & Study Skills
Study Group Readiness: Learning Approaches & Study SkillsStudy Group Readiness: Learning Approaches & Study Skills
Study Group Readiness: Learning Approaches & Study SkillsRosa Martinez
 
Study Group Readiness: Time & Communication Dimensions
Study Group Readiness: Time & Communication DimensionsStudy Group Readiness: Time & Communication Dimensions
Study Group Readiness: Time & Communication DimensionsRosa Martinez
 
Self directed learning
Self directed learningSelf directed learning
Self directed learningRosa Martinez
 
Self directed learning
Self directed learningSelf directed learning
Self directed learningRosa Martinez
 
Deep & surface learning
Deep & surface learningDeep & surface learning
Deep & surface learningRosa Martinez
 

Mehr von Rosa Martinez (20)

Mohamed oral anesthesia
Mohamed oral anesthesiaMohamed oral anesthesia
Mohamed oral anesthesia
 
Maria's Oral med + oral patho + radio
Maria's Oral med + oral patho + radioMaria's Oral med + oral patho + radio
Maria's Oral med + oral patho + radio
 
Mohamed's oral pathology,medicine and radiography
Mohamed's oral pathology,medicine and radiographyMohamed's oral pathology,medicine and radiography
Mohamed's oral pathology,medicine and radiography
 
Endo case studies answers
Endo case studies answersEndo case studies answers
Endo case studies answers
 
Endodontics study cases
Endodontics study casesEndodontics study cases
Endodontics study cases
 
Periodontics case studies answers
Periodontics case studies answersPeriodontics case studies answers
Periodontics case studies answers
 
Periodontology: Mohamed Zeina
Periodontology: Mohamed ZeinaPeriodontology: Mohamed Zeina
Periodontology: Mohamed Zeina
 
Periodontics case studies
Periodontics case studiesPeriodontics case studies
Periodontics case studies
 
Pediatric case studies
Pediatric case studiesPediatric case studies
Pediatric case studies
 
Orthodontics dhenelyn
Orthodontics dhenelynOrthodontics dhenelyn
Orthodontics dhenelyn
 
Ortho moh
Ortho mohOrtho moh
Ortho moh
 
Study group readiness training wrap up
Study group readiness training wrap upStudy group readiness training wrap up
Study group readiness training wrap up
 
Orthodontics june 26
Orthodontics june 26Orthodontics june 26
Orthodontics june 26
 
Study Group Readiness: IT Learning Tools
Study Group Readiness: IT Learning ToolsStudy Group Readiness: IT Learning Tools
Study Group Readiness: IT Learning Tools
 
Study Group Readiness: Learning Approaches & Study Skills
Study Group Readiness: Learning Approaches & Study SkillsStudy Group Readiness: Learning Approaches & Study Skills
Study Group Readiness: Learning Approaches & Study Skills
 
Study Group Readiness: Time & Communication Dimensions
Study Group Readiness: Time & Communication DimensionsStudy Group Readiness: Time & Communication Dimensions
Study Group Readiness: Time & Communication Dimensions
 
Self directed learning
Self directed learningSelf directed learning
Self directed learning
 
Self directed learning
Self directed learningSelf directed learning
Self directed learning
 
Study action plan
Study action planStudy action plan
Study action plan
 
Deep & surface learning
Deep & surface learningDeep & surface learning
Deep & surface learning
 

Kürzlich hochgeladen

Fabric RFID Wristbands in Ireland for Events and Festivals
Fabric RFID Wristbands in Ireland for Events and FestivalsFabric RFID Wristbands in Ireland for Events and Festivals
Fabric RFID Wristbands in Ireland for Events and FestivalsWristbands Ireland
 
A flour, rice and Suji company in Jhang.
A flour, rice and Suji company in Jhang.A flour, rice and Suji company in Jhang.
A flour, rice and Suji company in Jhang.mcshagufta46
 
Slicing Work on Business Agility Meetup Berlin
Slicing Work on Business Agility Meetup BerlinSlicing Work on Business Agility Meetup Berlin
Slicing Work on Business Agility Meetup BerlinAnton Skornyakov
 
Project Brief & Information Architecture Report
Project Brief & Information Architecture ReportProject Brief & Information Architecture Report
Project Brief & Information Architecture Reportamberjiles31
 
MC Heights construction company in Jhang
MC Heights construction company in JhangMC Heights construction company in Jhang
MC Heights construction company in Jhangmcgroupjeya
 
The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...
The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...
The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...Brian Solis
 
Building Your Personal Brand on LinkedIn - Expert Planet- 2024
 Building Your Personal Brand on LinkedIn - Expert Planet-  2024 Building Your Personal Brand on LinkedIn - Expert Planet-  2024
Building Your Personal Brand on LinkedIn - Expert Planet- 2024Stephan Koning
 
7movierulz.uk
7movierulz.uk7movierulz.uk
7movierulz.ukaroemirsr
 
Intellectual Property Licensing Examples
Intellectual Property Licensing ExamplesIntellectual Property Licensing Examples
Intellectual Property Licensing Examplesamberjiles31
 
BCE24 | Virtual Brand Ambassadors: Making Brands Personal - John Meulemans
BCE24 | Virtual Brand Ambassadors: Making Brands Personal - John MeulemansBCE24 | Virtual Brand Ambassadors: Making Brands Personal - John Meulemans
BCE24 | Virtual Brand Ambassadors: Making Brands Personal - John MeulemansBBPMedia1
 
IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...
IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...
IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...AustraliaChapterIIBA
 
Tata Kelola Bisnis perushaan yang bergerak
Tata Kelola Bisnis perushaan yang bergerakTata Kelola Bisnis perushaan yang bergerak
Tata Kelola Bisnis perushaan yang bergerakEditores1
 
Ethical stalking by Mark Williams. UpliftLive 2024
Ethical stalking by Mark Williams. UpliftLive 2024Ethical stalking by Mark Williams. UpliftLive 2024
Ethical stalking by Mark Williams. UpliftLive 2024Winbusinessin
 
AMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdf
AMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdfAMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdf
AMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdfJohnCarloValencia4
 
Anyhr.io | Presentation HR&Recruiting agency
Anyhr.io | Presentation HR&Recruiting agencyAnyhr.io | Presentation HR&Recruiting agency
Anyhr.io | Presentation HR&Recruiting agencyHanna Klim
 
TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...
TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...
TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...TalentView
 
Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024Borderless Access
 
Introduction to The overview of GAAP LO 1-5.pptx
Introduction to The overview of GAAP LO 1-5.pptxIntroduction to The overview of GAAP LO 1-5.pptx
Introduction to The overview of GAAP LO 1-5.pptxJemalSeid25
 
Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024Borderless Access
 
Entrepreneurship & organisations: influences and organizations
Entrepreneurship & organisations: influences and organizationsEntrepreneurship & organisations: influences and organizations
Entrepreneurship & organisations: influences and organizationsP&CO
 

Kürzlich hochgeladen (20)

Fabric RFID Wristbands in Ireland for Events and Festivals
Fabric RFID Wristbands in Ireland for Events and FestivalsFabric RFID Wristbands in Ireland for Events and Festivals
Fabric RFID Wristbands in Ireland for Events and Festivals
 
A flour, rice and Suji company in Jhang.
A flour, rice and Suji company in Jhang.A flour, rice and Suji company in Jhang.
A flour, rice and Suji company in Jhang.
 
Slicing Work on Business Agility Meetup Berlin
Slicing Work on Business Agility Meetup BerlinSlicing Work on Business Agility Meetup Berlin
Slicing Work on Business Agility Meetup Berlin
 
Project Brief & Information Architecture Report
Project Brief & Information Architecture ReportProject Brief & Information Architecture Report
Project Brief & Information Architecture Report
 
MC Heights construction company in Jhang
MC Heights construction company in JhangMC Heights construction company in Jhang
MC Heights construction company in Jhang
 
The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...
The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...
The End of Business as Usual: Rewire the Way You Work to Succeed in the Consu...
 
Building Your Personal Brand on LinkedIn - Expert Planet- 2024
 Building Your Personal Brand on LinkedIn - Expert Planet-  2024 Building Your Personal Brand on LinkedIn - Expert Planet-  2024
Building Your Personal Brand on LinkedIn - Expert Planet- 2024
 
7movierulz.uk
7movierulz.uk7movierulz.uk
7movierulz.uk
 
Intellectual Property Licensing Examples
Intellectual Property Licensing ExamplesIntellectual Property Licensing Examples
Intellectual Property Licensing Examples
 
BCE24 | Virtual Brand Ambassadors: Making Brands Personal - John Meulemans
BCE24 | Virtual Brand Ambassadors: Making Brands Personal - John MeulemansBCE24 | Virtual Brand Ambassadors: Making Brands Personal - John Meulemans
BCE24 | Virtual Brand Ambassadors: Making Brands Personal - John Meulemans
 
IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...
IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...
IIBA® Melbourne - Navigating Business Analysis - Excellence for Career Growth...
 
Tata Kelola Bisnis perushaan yang bergerak
Tata Kelola Bisnis perushaan yang bergerakTata Kelola Bisnis perushaan yang bergerak
Tata Kelola Bisnis perushaan yang bergerak
 
Ethical stalking by Mark Williams. UpliftLive 2024
Ethical stalking by Mark Williams. UpliftLive 2024Ethical stalking by Mark Williams. UpliftLive 2024
Ethical stalking by Mark Williams. UpliftLive 2024
 
AMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdf
AMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdfAMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdf
AMAZON SELLER VIRTUAL ASSISTANT PRODUCT RESEARCH .pdf
 
Anyhr.io | Presentation HR&Recruiting agency
Anyhr.io | Presentation HR&Recruiting agencyAnyhr.io | Presentation HR&Recruiting agency
Anyhr.io | Presentation HR&Recruiting agency
 
TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...
TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...
TalentView Webinar: Empowering the Modern Workforce_ Redefininig Success from...
 
Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024
 
Introduction to The overview of GAAP LO 1-5.pptx
Introduction to The overview of GAAP LO 1-5.pptxIntroduction to The overview of GAAP LO 1-5.pptx
Introduction to The overview of GAAP LO 1-5.pptx
 
Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024Borderless Access - Global B2B Panel book-unlock 2024
Borderless Access - Global B2B Panel book-unlock 2024
 
Entrepreneurship & organisations: influences and organizations
Entrepreneurship & organisations: influences and organizationsEntrepreneurship & organisations: influences and organizations
Entrepreneurship & organisations: influences and organizations
 

Operative and crown questions

  • 2. From page 325-330  Page 329: 6-Which of the following materials are LEAST suitable for impressions for cast gold restorations? A. Polysulfides. B. Polyvinyl siloxanes. C. Polyethers. D. Irreversible hydrocolloids Non aqueous elastomeric material aqueous elastomeric material
  • 3. Answer: Therefore, alginate is an acceptable impression material for study models, but it is an unacceptable impression material for the fabrication of bridges, crowns, and inlays. Nearly all impression materials are acceptable for full-denture impressions. Clinical aspect of dental material chapter 8 page 117
  • 4. The disadvantage of the material being predominantly water is that water evaporates from the surface of the impression if it is left exposed to air. When the water evaporates, the impression shrinks and is no longer accurate
  • 5. Hydrocolloid materials contract slightly after setting and exude water. This process is called syneresis. Syneresis occurs very slowly, but it is a second reason to pour hydrocolloid impressions as soon as possible
  • 6. When disinfecting a hydrocolloid impression, however, it is important to limit the time that the impression is exposed to an aqueous disinfecting solution. The hydrocolloid will absorb water, swell, and distort. This is called imbibition.
  • 7. 7-In metal-ceramic crowns, the bond between the materials is A. mainly mechanical. B. mainly chemical. C. decreased by oxides on the metal surface. D. decreased when the metal has a high yield point.
  • 8. Introduction to metal ceramic restoration page 83
  • 9. 8-Nickel-chromium alloys designed for porcelain bonded to metal crowns should be used with caution because A. nickel is an allergen. B. the modulus of elasticity is low. C. these alloys cannot be soldered. D. None of the above.
  • 10. Introduction to metal ceramic restoration page 35
  • 11. 9-For application of porcelain to a ceramo-metal alloy, the correct viscosity is achieved by mixing the porcelain powder with A. a porcelain modifier. B. pure methyl alcohol. C. a mild detergent. D. distilled water
  • 12. Introduction to metal ceramic restoration page 17
  • 13. Page 330 1-A model prepared from a vacuum mixed stone has higher strength because A. less water is required for vacuum mixing. B. there is less porosity. C. some of the water is removed by the vacuum. D. the nuclei for crystallization are more numerous.
  • 14.  Stone is made from gypsum by carefully controlled calcination under steam pressure in a closed container. This method of calcination slowly releases the water of crystallization from the crystal so that the resultant powder particle (Fig. 9.4B)is more regular, more uniform in shape, and less porous compared to that of plaster.
  • 15.  Stone is stronger and more expensive than plaster. It is used mainly in making casts for diagnostic purposes and casts for complete and partial denture construction, which require greater strength and surface hardness than that of plaster
  • 16.  The dense particles of stone require less gauging water to float them, and their regular shape allows them to roll over one another more easily.
  • 17.  This difference in the amount of measured water that is required to make a workable mix results in different consistencies for the products when first mixed at the proper water/powder ratio. Plaster is usually thin in consistency, like a ‘smoothie,’ whereas improved stone is like thick cake batter. Dental stone has an intermediate consistency. The water/powder ratio has a direct effect on the properties of each gypsum product and must be controlled for optimum
  • 18.  The strength depends on the porosity of the set material, and the porosity relates to the water/powder ratio necessary to make a workable mix. Plaster,which requires the most gauging water to make a fluid mix, is the weakest in strength, with improved stone being the strongest and stone being intermediate between the two.
  • 19.  Table 9.1 One-Hour Compressive Strengths and Water/Powder Ratios of Gypsum Products  Minimum 1-Hour Compressive  Gypsum Strength (lb/in2 [Mpa])a Water/Powder Ratiob  Plaster (Type II) 1,300 (9) 45–50 ml/100 g (0.45–0.50)  Dental stone (Type III) 3,000 (21) 28–30 ml/100 g (0.28– 0.30)  Dental stone, high-strength (Type IV) 5,000 (34) 19–24 ml/100 g (0.19–0.24)  Clinical aspect of dental material chapter 9 page 132
  • 20. 2-Impression trays should be A. rigid. B. flexible enough to permit easy insertion. C. carefully polished on the interior. D. held in place by the patient.
  • 21.  With any system, tray rigidity is important, because even slight flexing of the tray will lead to a distorted impression. This is particularly frustrating because the errors are usually undetectable until the practitioner attempts to seat the restoration.  For this reason, thin, disposable plastic trays are unacceptable . Resin thicknesses of 2 to 3 mm are needed for adequate rigidity. Clearance between the tray and the teeth should also be 2 to 3 mm; however, greater clearance is necessary for the more rigid polyether Materials. Contempory fixed prosthesis section II page 365
  • 22. 3-A ceramometal posterior fixed partial denture pontic should ??? A. A. be constructed to have an occlusal surface one quarter the width of the tooth it replaces. B. be constructed to have an occlusal surface wider than the width of the tooth it replaces. C. cover as much mucosa as possible. D. provide adequate embrasure spaces.