Thesis (M.Sc.) - Cairo University - Faculty Of Oral and Dental Medicine - Department Of Prosthodontics

Specific considerations should be given to the marginal accuracy of the all - ceramic system , even when resin bonding is usedThe longevity of fixed prostheses depends on the retention and marginal integrity of restorations (49) There is general agreement that restorations should have perfect adaptation to the abutment teeth with margins as close as possible to the prepared marginal design to ensure their long term success (50 - 55) The presence of marginal discrepancies in the restoration exposes the luting agent to the oral environmentThe larger the marginal discrepancy and subsequent exposure of the dental luting agent to the oral fluids , the more rapid is the rate of cement dissolution , (56) with retention of bacterial plaque and other irritants that represent a potential risk to the vital pulpThe longevity of the tooth could be compromised , not only by caries but also by periodontal disease (59) , (60)

Issued also as CD