ADC - Australian Dental Council Prosthodontics and Dental Implants Questions and Answers

Question 1

A 55-year-old patient requires a full coverage crown for tooth 25, which has had root canal treatment and a large MOD amalgam restoration.
Clinical examination reveals 1.5mm of sound coronal tooth structure above the gingival margin circumferentially.
What is the most critical factor for the long-term fracture resistance of the final restoration?

Accepted Answer

Achieving an adequate ferrule effect.

Answer

The type of luting cement used.

Answer

The choice of post and core material.

Answer

The occlusal anatomy of the crown.

Question 2

When taking a final impression for multiple, non-parallel implants intended for a splinted, screw-retained bridge, which technique is generally considered more accurate for capturing the precise three-dimensional orientation of the implants?

Accepted Answer

Open-tray impression technique.

Answer

A dual-arch (triple tray) impression technique.

Answer

Closed-tray impression technique.

Answer

Digital scanning with a standard intraoral scanner.

Question 3

A 72-year-old patient received new complete maxillary and mandibular dentures one week ago. They return complaining that the lower denture lifts every time they move their tongue. Which of the following is the most likely cause?

Accepted Answer

The mandibular lingual flanges are overextended.

Answer

The occlusal vertical dimension is too high.

Answer

The posterior palatal seal of the maxillary denture is inadequate.

Answer

The denture teeth are set too far buccally.

Question 4

Which of the following is the primary function of a major connector in a mandibular removable partial denture?

Accepted Answer

To unite all components and distribute forces across the arch.

Answer

To provide direct retention for the prosthesis.

Answer

To provide vertical support against occlusal forces.

Answer

To prevent horizontal movement of the abutment teeth.

Question 5

A 60-year-old patient with an implant-supported crown on tooth 46, placed 5 years ago, presents for a routine check-up. Probing around the implant reveals a 6mm pocket with bleeding on probing. What is the most crucial additional diagnostic information required to differentiate between peri-mucositis and peri-implantitis?

Accepted Answer

Comparison with a baseline radiograph.

Answer

The presence of suppuration from the pocket.

Answer

The mobility of the implant-supported crown.

Answer

The patient's reported level of discomfort.

Question 6

A 30-year-old patient requires a single full-coverage crown on tooth 11 and is primarily concerned with achieving the best possible aesthetics. The tooth has sufficient coronal structure, and there are no signs of parafunctional habits. Which all-ceramic material would be the most appropriate choice to primarily meet the patient's aesthetic demands?

Accepted Answer

Lithium disilicate (e.g., IPS e.max).

Answer

Monolithic high-strength zirconia.

Answer

Porcelain-fused-to-metal (PFM).

Answer

A gold alloy.