retention and stability

Question 1

What are the causes of midline fracture?

Answer 1

• teeth arranged outside the crest of the ridge
• accidental (falling of denture on ground)
• excessively wide v-notch
• lack of relief of median palatine raphe

Question 2

What are th steps of midline fracture repair?

Answer 2

1. broken parts are assembled in their original position using sticky wax on the polished surface and assembled parts may be strengthened wooden sticks
2. pour cast
3. widen fracture line (dovetails are
   made at the edges on both sides to increase the mechanical retention of the new material on both sides) for self cure acrylic resin

Question 3

What arethe steps or repairing fractured with missing parts?

Answer 3

1. rubber base impression material is applied to the missing part
2. after setting of the impression material the denture is removed from the patient’s mouth
3. separating medium is applied and a cast is poured
4. the impression part is removed, replaced by wax, carved to
   reassemble the broken denture flange, flasked, packed with resin material, cured, finished and polished

Question 4

How to repair a fractued or lost tooth?

Answer 4

replace the tooth with a new one and stick it with self cure (anterior)