1. 9. Record Base and Wax Rim Fabrication Michael Hamada, DDS and John Beumer III, DDS, MS Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry UCLA School of Dentistry This program of instruction is protected by copyright ©. No portion of this program of instruction may be reproduced, recorded or transferred by any means electronic, digital, photographic, mechanical etc., or by any information storage or retrieval system, without prior permission.

2. 8. Boxing Impressions and Making Casts John Beumer III, DDS, MS and Robert Duell, DDS Division of Advanced Prosthodontics, Biomaterials and Hospital Dentistry UCLA School of Dentistry This program of instruction is protected by copyright ©. No portion of this program of instruction may be reproduced, recorded or transferred by any means electronic, digital, photographic, mechanical etc., or by any information storage or retrieval system, without prior permission.

21. Record Base Preparation Maxilla Areas requiring modification on unfinished record bases Land Flash

23. Trim the excess acrylic resin that extends onto the land of the cast (flash) as shown here . Note: The only portion of the record base that is highly polished is the periphery. Record Base Preparation - Mandible

26. Thick maxillary record bases and convex contours of mandibular record bases impinge upon the tongue space and prevent the patient from articulating speech sounds in a normal fashion . Result – vertical dimension of occlusion and centric relation records made from such record bases may be inaccurate. The “s” sound is particularly useful when determining the vertical dimension of occlusion Patient in the “S” position

33. f) Heat the occlusal plane former in a flame and carefully form the occlusal aspect of the rim. Catch the melted wax in a paper towel. g) Form the buccal and labial contours with the hot plate in a similar manner. If there are voids fill them with wax and repeat the process. Technical Procedures

36. The mandibular wax rim is fabricated in a similar manner, however, the rim should be centered over the crest of the ridge. Lingual contours must not impinge on the tongue space. Mandibular Wax Rim

37. Completed Wax Rims

38. a. Face Bow Transfer Record The face bow bite fork is attached to the wax rim and this apparatus is positioned intra-orally. The face bow apparatus is attached and appropriately adjusted and transferred to the articulator, permitting proper mounting of the maxillary cast on the upper member of the articulator .

40. b. Determine Incisor Position and Occlusal Plane Record base and wax rim is placed into position and a “Fox” occlusal plane can be used to verify the proper level and angulation of the occlusal plane. If the wax rim does not conform to the landmarks indicating the proper plane of occlusion (Camper’s plane) the was rim is altered until it does conform.

42. c . Aid in developing contour of the lips and cheeks . Wax rim is contoured with the rim former until the desired lip and cheek contours are developed

43. d. Determine the Proper Vertical Dimension of Occlusion The wax rims aid the clinician in determining the proper vertical dimension of occlusion.

44. Wax rims are used as an aid to determine the proper vertical dimension of occlusion and making centric relation records and transferring them to the articulator. e. Used to Make Centric Relation Records

47. A wax rim properly contoured in the anterior region (arrows) aids in positioning the anterior teeth. Anterior maxillary teeth are arranged according to the labial contours developed in the patient. f. Maxillary Record Base and Wax Rim