I85PREP
⌘ K
Cambodia Dentistry Exit Exam study materials
Cambodia Dentistry Exit Exam study resources

Cambodia Dentistry Exit Exam: Prosthodontics

Cambodia Dentistry Exit Exam · Work through your exam, one topic at a time.

All guide sections

Prosthodontics

What this domain tests

The exam probes whether you can distinguish retention, support and stability, apply Applegate's rules and Kennedy classification, and justify design choices for removable and fixed prostheses.

Core rules

  • Retention resists vertical displacement, support resists vertical seating force, stability resists horizontal and rotational movement. A complete denture needs border seal and adaptive soft-tissue contact for retention, and a well-extended primary cast for support.
  • Definitive impressions record the denture-bearing area at rest; border moulding captures the functional sulcus. The master cast is often altered for a secondary or functional impression.
  • Occlusal schemes: bilateral balanced occlusion for complete dentures, monoplane for severely resorbed ridges, lingualised occlusion to reduce lateral forces.
  • Kennedy classification is by the most posterior edentulous space; Applegate's rules then assign the class, and the modification count records additional spaces.
  • Rests must sit on rest seats prepared in enamel or restorative material, directing force along the long axis of the abutment. RPI (rest, proximal plate, I-bar) reduces torque on distal extension abutments.
  • Major connectors: lingual bar needs at least 4 mm of lingual sulcus depth, otherwise a lingual plate; complete palatal coverage for maxillary tooth-tissue-supported prostheses.

Worked example

A mandible has a missing 36 and 37 with a bounded space, plus missing 46 and 47. Reasoning: the most posterior space is on the right, so this is Kennedy Class II modification 1 - the left bounded space is the modification. Design: tooth-supported on the left, distal extension on the right, so use an RPI or stress-releasing design on the right abutment and a major connector with adequate rigidity.

Traps

Classifying by the first space you notice rather than the most posterior; counting the modification as a class; extending a distal extension base onto mobile soft tissue without relief; forgetting that a lingual bar requires sulcus depth.