Resin-Bonded Fixed Partial Denture (RBFPD)

A comprehensive set of practice questions covering the historical development, indications, contraindications, advantages, disadvantages, preparation principles, and surface treatments of Resin-Bonded Fixed Partial Dentures (RBFPD).

What is the definition of a Resin-Bonded Fixed Partial Denture (RBFPD)?

A Fixed Partial Denture consisting of one or more pontics supported by thin retainers bonded lingually and proximally to the enamel of the abutment teeth.

Who developed the Cast Perforated RBFPD in 1973 and what was its primary retention method?

It was developed by Rochette, using flared perforations of the metal casting to provide mechanical retention.

What is the common name for the Etched-Cast RBFPD developed in 1980, and how is micromechanical retention achieved?

It is known as the Maryland Bridge; retention is achieved through electrolytic etching of the cast base metal using hydrochloric acid.

What technique was developed at Virginia University in 1983 to create macroscopic undercuts on the fitting surface of RBFPD retainers?

The lost salt crystal technique.

In chemical-bonding RBFP (Adhesion Bridges), what are the preliminary steps before applying the resin cement?

Air abrasion of the alloy surface using $Al_2O_3$, followed by the application of a primer.

Name four advantages of Resin-Bonded Fixed Partial Dentures.

1. Minimal removal of tooth structure, 2. Minimal potential for pulpal trauma, 3. Anesthesia is not usually required, 4. Reduced chair time and patient expense.

List four indications for the use of RBFPD.

1. Replacement of missing anterior teeth in children & adolescents, 2. Short edentulous spans, 3. Unrestored abutments, 4. Excellent moisture control.

What are three contraindications for the use of RBFPD?

1. Parafunctional habits, 2. Long edentulous spans, 3. Compromised enamel or Nickel allergy.

For anterior tooth preparation, what is the required amount of lingual reduction?

$$0.6-0.8\,mm$$

What specific design feature is used in posterior RBFPD to increase resistance to lingual displacement?

A $180^\circ$ wrap around extension.

How deep should the vertical stops (occlusal rests) be in the preparation for posterior RBFPD?

$1\,mm$ deep.

How does the lingual surface preparation of maxillary molars differ from mandibular molars for RBFPD?

The lingual wall of mandibular teeth may be prepared in a single plane, whereas maxillary molars require a two-plane reduction on functional cusps.

According to the lecture, which two resin cement systems are categorized as 'Self-adhesive Systems'?

Maxcem (Kerr Corp.) and RelyX Unicem (3M ESPE Dental).

What are the three mechanical methods for macro-mechanical metal surface treatment?

1. Cast perforated, 2. Salt crystals, 3. Mesh pattern.

List the three types of micro-mechanical metal surface treatments mentioned in the transcript.

1. Electrolytic etching, 2. Chemical etching, 3. Sandblasting (air).

Name the four methods of chemical interfacial bonding for metal surface treatment.

1. Tin-plating, 2. Ion-coating, 3. Silicoater, 4. Rocatec system.

What is the primary reason for maintaining a single path of insertion in anterior RBFPD preparation?

To resist displacement in any other direction (oblique or rotational).

In postoperative care, why is calculus removal recommended with hand instruments rather than ultrasonic scalers?

To reduce the risk of debonding the RBFPD.

What material is mentioned as an alternative to metal retainers for better esthetics in RBFP?

Ceramic retainers, specifically Zirconia.