Answer: (e)
Today, many teeth previously regarded as hopeless are treatable via GTR. This includes the Class II furcations, large three walled infrabony defects and osseous craters. Therefore, 1 and 2 are both true. 3 The first statement is true and the second statement is false. Horizontal bone loss is not amenable to GTR. If the interdental space is wide, the surgical procedure of choice is the modified papilla preservation technique. The interdental papilla is horizontally dissected at its base on the buccal side and elevated with a palatal full-thickness flap. After membranes positioning, the papilla is repositioned though the interdental space to cover the barrier and possibly sutured to the buccal flap to obtain primary closure. If the interdental space is narrow, the simplified papilla preservations technique should be used. The interdental papilla is obliquely dissected to augment the connectible tissue surface for the subsequent primary closure of the lap over the barrier membrane. Anatomic prerequisites for an uneventful procedure include the presence of adequate band of attached gingiva and absence of frena in the area of treatment. 5 is false; the root proximity must be greater than 2 mm to be successful; in shallow defects (<2mm)>
1. adequate separation (>2mm) for access and to maintain collar.
2. an anatomy of the affected dental surface that allows good adaptation of the membrane and closure of the defect,
3. a good quantity of healthy periodontium remaining close to the defect and
a thick periodontium and adulated vestibulum to allow for flap stability
6 is true-titanium reinforced Gore-Tex regenerative membranes can be placed in transgingival and submerged configurations allowing extension through the gingiva or where the defect can be completely isolated.
Nobel Biocare Gore Regenerative Materials Product Configuration Information; Critical Decisions in Periodontology by Hall, 4th Ed. Chapters 37, 86, 87, 88, 89; Manual of Clinical Periodontics-Reference manual by Lexi-Comp
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