Flashcards on Resin-Bonded Fixed Partial Dentures
Dental Ceramics: History, Strength & Types for Students
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Partial Prostheses
12 cards
Card 1
Question: What were the early resin-bonded pontics in resin-bonded fixed partial dentures (RBFPDs)?
Answer: Extracted natural teeth or acrylic resin teeth used as pontics, bonded to the proximal and lingual surfaces of abutment teeth with composite resin.
Card 2
Question: What reinforcements were used to reduce fractures in the composite resin connections retaining pontics?
Answer: Support wires, stainless steel mesh, or polyethylene fiber mesh (Ribbon).
Card 3
Question: What are the clinical limitations of the mentioned resin-bonded pontics?
Answer: Limited to small anterior spaces, restricted longevity; degradation of the composite bond to the mesh or wire leads to failure—used as provisional res
Card 4
Question: What innovation did Rochette propose in 1973 for metal retention to teeth?
Answer: Metal retention through enlarged perforations in the metal casting, allowing composite resin to extrude and provide mechanical retention after polymer
Card 5
Question: How did Howe and Denehy (1977) apply the concept of perforations in practice?
Answer: They used them in metal-ceramic pontics; they extended the framework to cover the maximum enamel surface on the lingual aspects with minimal preparati
Card 6
Question: What did Livaditis (1980) add to the concept of perforated RBFPDs?
Answer: He expanded its use for posterior tooth replacement, suggesting abutment preparation to establish a defined occlusogingival path of insertion.
Card 7
Question: What is the typical mode of failure for prostheses with perforated retainers, and what is the key point in their management?
Answer: The typical failure occurs when only one wing debonds from the tooth; the key point is the retrievability (possibility of removal and repair) of the r
Card 8
Question: Why is it dangerous not to remove a partially debonded prosthesis?
Answer: Because there is a high risk of caries developing under the debonded retainer if the prosthesis is not recemented or replaced promptly.
Card 9
Question: What should a patient with a perforated-retained prosthesis be advised to do in case of partial debonding?
Answer: Seek immediate dental care to recement or replace the prosthesis before a carious lesion forms.
Card 10
Question: According to Boyer et al. (1993), what is the estimated time to 50% failure (debonds) for the perforated design in two-wing studies over ~10 years?
Answer: Approximately 110 months.