Question 127 (part 2) · LDEK · Restorations — technique and errors
Choose true sentences regarding clinical aspects of cavity restorations:
1) closed sandwich technique is used when all of the cavity edges are located in enamel; glass-ionomer cement restores dentin and composite restores enamel;
2) in a situation where gingival edge is located within root cementum/dentin, glass-ionomer cement is left in gingival area without covering it with composite – open sandwich;
3) in case of open sandwich technique, gingival edge is obliquely cut on proximal surface;
4) in occluso-ginigval layer technique, layers of material are placed horizontally, sequentially one by one;
5) in bucco-lingual layer technique, first layer of composite is placed on dentin surface without contact with opposite cavity walls, subsequent layers are introduced in the shape of a wedge.
Correct answer is:
2) in a situation where gingival edge is located within root cementum/dentin, glass-ionomer cement is left in gingival area without covering it with composite – open sandwich;
3) in case of open sandwich technique, gingival edge is obliquely cut on proximal surface;
4) in occluso-ginigval layer technique, layers of material are placed horizontally, sequentially one by one;
5) in bucco-lingual layer technique, first layer of composite is placed on dentin surface without contact with opposite cavity walls, subsequent layers are introduced in the shape of a wedge.
Correct answer is:
- A. 1,3,5.
- B. 1,2,4.
- C. 3,4,5.
- D. 2,4,5.
- E. 1,3,4.
Hint
Ask where the gingival margin lies in closed and open sandwich, whether a margin without enamel can be bevelled, and how layers are oriented in each technique.
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