Record Base - Dental Procedures PDF

Record base Marketing Department Mon. Feb. 21. 2018 Record base Record base Record base Record Bases and Occlusion blocks chapter 8  Occlusion blocks Definition; Occlusion blocks consist of occlusion rims attached to well fitting trial d...

Record base Marketing Department Mon. Feb. 21. 2018 Record base Record base Record base Record Bases and Occlusion blocks chapter 8  Occlusion blocks Definition; Occlusion blocks consist of occlusion rims attached to well fitting trial denture bases. The record base and occlusion rim are necessary for (1) Establishing facial contours. (2) Aid in tooth selection (3) Establishing and maintaining the vertical dimension of occlusion during records making (4) Making interocclusal records (5) Arrangement of the denture teeth (6) Waxed-up mold for the external surface of the complete denture. Record base  Requirements of a trial denture base; –It should be : – 1-rigid. – 2- Accurately adapted to the cast with proper extensions. – 3- Dimensionally stable with minimal warpage during its use. – 4- Relieved from any undercuts→ to avoid scrapping the cast during insertion and removal. – 5- Clean & smooth → Pt. comfort. – 6- Proper & uniform thickness →2mm – 7- Easy to construct. Record base WAX block out To protect the master casts, tissue undercuts and irregularities are blocked out with base plate wax locations for undercuts or irregularities on the maxillary casts are on The labial of the anterior ridge. Rugae areas sometimes in the tuberosity areas laterally. On the mandibular cast Retromylohyoid areas Record base Record base Following the block out of the master cast: The cast is soaked in room temperature water for 5 minutes in order to expel air from within the stone help minimize the formation of bubble-like defects in the completed record base. Record base A tinfoil substitute is used as a separating medium to protect the cast and allow the separation of the record base. Record base The tinfoil substitute is applied twice, allowing the first application to dry prior to applying a second coat. Each application is applied as a thin film to all surfaces of the cast, including land areas and the sides of base that may come in contact with the resin. Record base The record base is fabricated with autopolymerizing acrylic resin Tinfoil substitute is applied in two thin layers , allowing the first layer to dry prior to adding the second. Record base The record base should be thinner on the crest of the ridges and buccal to the crest of the ridges because space may be limited when the denture teeth are being arranged at a future date. Record base Occlusion Rim Fabrication  Occlusion rims: Occlusion rims are generally made of pink modeling wax. Uses of occlusion rim: – 1. Registration of jaw relationships. – 2. Choice of the artificial teeth: i. Midline is determined on it. ii. High and low lip lines are determined on it to indicate the length of the teeth. iii. Canine lines → width of the teeth. Distance between the canine line & the posterior end of the occlusion rim → M-D width of posterior teeth. – 3. Setting-up of teeth. – 4.Support for lip & cheeks. Record base Record base  WIDTH of occlusal rims approximately 8–10 mm in width in the posterior. 6–8 mm in width in the anterior region. Record base Dimensions of occlusal rims Record base The labial surface of the maxillary occlusion rim in the central area is approximately 6-8 mm anterior to the middle of incisive papilla, and is inclined labially  The vertical height of the mandibular occlusion rim, is about 18mm The posterior lower region the height is equal to a point representing TWO-THRID the height of the retromolar pad.(middle to upper third) Record base Record base Important to continuously inform the patients that the record bases and occlusion rims are not part of the completed dentures, and that they may feel a little loose because of the required blocked-out undercuts. Record base Record base Record base  References Rahn, A. O.: Record bases and occlusion rims. In: Rahn, A. O., Heartwell, C. M., editors: Textbook of complete dentures. 5th ed. Philadelphia: Lea & Febiger; 1993. pp. 265–268. Sowter, J. B., Baseplates. In Barton, R. E., ed.: Removable Prosthodontic Techniques. Revised edition. Chapel Hill: University of North Carolina Press; 1986. pp. 32- 39. Zarb, G. A., Finer, Y.: Identification of shape and location of arch form: The occlusion rim andrecording of trial denture base. In: Zarb, G. A., Bolander, C. L., eds. Prosthodontic Treatment for Edentulous Patients. 12th ed. St. Louis: Mosby Inc; 2004. pp. 252-261. Thank You