Descripción: A removable partial denture is a metallic structure supporting artificial teeth, destined to recover the six following oral functions: chewing, aesthetic, phonetic, weakened tooth stabilization, pr...
SIUST, College of Dentistry Removable Prosthodontics II
Acrylic Removable Partial Dentures It is a dental prosthesis which artificially supplied teeth and associated structures in a partially edentulous arch, made of acrylic resin (polymethylmethacrylate), and can be removed from the mouth and replaced at will. They could be: 1. Temporary (Interim) R.P.D. is a dental prosthesis used for a short time for reasons of: i. Esthetics ii. Mastication iii. Occlusal support iv. Conditioning the patient to accept an artificial substitute for missing natural teeth until a more definite prosthetic dental treatment can be provided. 2. Transitional R.P.D. serves as a temporary prosthesis and to which more artificial teeth will be added as more teeth are lost, and will be replaced after post-extraction tissue changes have occurred. 3. Treatment R.P.D. is used for the purpose of treating or conditioning the tissues which are called upon to support and retain a denture base. 4. Immediate P.D. is a dental prosthesis used to replace one or more teeth and is inserted on the day of extraction of the tooth or teeth. It is constructed before the extraction of unwanted teeth and is inserted immediately after their removal.
-1-
SIUST, College of Dentistry Removable Prosthodontics II
Advantages: 1. Not expensive. 2. Light in weight. 3. Simpler design. 4. Easily constructed. 5. Easily added if a present natural tooth is extracted. 6. Easily relined if bone has been resorbed. 7. Easily repaired if fractured. 8. Good appearance if extended labially or buccally because its colour resembles that of the gingivae. 9. Easily adjusted by grinding at chair side.
Interproximal tooth extensions and regions where marginal gingiva is crossed by the prosthesis should be carefully adjusted (outlined in red).
Disadvantages: 1. Less patient response and tolerance for acrylic dentures than metallic denture. 2. Poor thermal conductivity. 3. Lower strength, therefore easily broken, so must be constructed in thick sections, resulting in larger denture. 4. Tendency for warpage if over-heated during polishing or during recurring in (repair or reline). -2-
SIUST, College of Dentistry Removable Prosthodontics II
5. Design difficulties, as: i. Ideal tooth supported is difficult. ii. Ideal indirect retention is difficult. iii. Impossible to use more sophisticated component, such as precision attachment & stress breakers. 6. Unnecessary tissue coverage, because of strength, retention and inhaling or swallowing considerations.
Uses: Temporary prostheses may be indicated as a part of total treatment for: 1. Sake of appearance. 2. Space maintenance. 3. Reestablishment of occlusal relationships. 4. To condition teeth & residual ridges. 5. To condition the patient for wearing a prosthesis.
