Question 81 (part 2) · LDEK · Cast partial dentures
Indicate true statements regarding orientation lines mapped on working models during the designing of cast removable dentures:
1) mapping of orientation lines is performed before estimation of introductory path;
2) mapping of orientation lines begins with lines of largest protuberances of abutment teeth and range of undercuts on alveolar process;
3) line of largest protuberance and depression margin on lateral surface of alveolar process is mapped in case of analysis of maxilla and mandible models;
4) after drawing orientation lines, places for retentive surfaces are determined, in which proper parts of retentive arms are placed.
Correct answer is:
2) mapping of orientation lines begins with lines of largest protuberances of abutment teeth and range of undercuts on alveolar process;
3) line of largest protuberance and depression margin on lateral surface of alveolar process is mapped in case of analysis of maxilla and mandible models;
4) after drawing orientation lines, places for retentive surfaces are determined, in which proper parts of retentive arms are placed.
Correct answer is:
- A. all of the above-mentioned.
- B. 1,2,4.
- C. 1,2,3.
- D. 2,3,4.
- E. 3,4.
Hint
Think about whether survey lines can be drawn before the tilt of the cast (the path of insertion) has been fixed on the surveyor.
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