Question 159 · LDEK · Complete dentures
The important retaining element for complete dentures is the peripheral seal. Indicate the true statements concerning the peripheral seal:
1) it prevents the air flow between adjacent surfaces, which causes so-called suction of the denture plate to the base area;
2) it should involve both, the denture margins and - in the case of the upper denture - a posterior border of the denture base in A-H zone;
3) in order to achieve the border seal, denture margins should be extended for about 3-4 mm beyond the neutral zone;
4) in order to achieve the border seal, denture margins should be extended for about 3.0 mm in the palatal A-H zone;
5) primary posterior palatal seal is performed on the working cast, based on reliable bone and soft tissue conditions.
The correct answer is:
2) it should involve both, the denture margins and - in the case of the upper denture - a posterior border of the denture base in A-H zone;
3) in order to achieve the border seal, denture margins should be extended for about 3-4 mm beyond the neutral zone;
4) in order to achieve the border seal, denture margins should be extended for about 3.0 mm in the palatal A-H zone;
5) primary posterior palatal seal is performed on the working cast, based on reliable bone and soft tissue conditions.
The correct answer is:
- A. 1,2,3.
- B. 1,2,4.
- C. 1,2,5.
- D. 1,2,3,5.
- E. 1,2,4,5.
Hint
Distinguish how far a border may exceed the neutral zone and how the posterior palatal seal is actually produced.
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