Do the changes in the surface texture of enamel and dentine induced by laser affect the microleakage of adhesive restorative material and result in preventing recurrent caries?
Absence of a seal at restoration margins permits entry of oral bacteria and fluids, which can result in postoperative sensitivity, adverse pulpal responses, and recurrent caries. There is a two- way interaction; the potential for leakage is influenced not only by the surface texture of the prepared tissues, but also by the composition and physical properties of restorative materials applied to it.
Of the 50 root canal samples 31 (62%) teeth had
recurrent caries 39 (78%) had inadequate obturation 35 (70%) had coronal leakage and 33 (66%) had oral communication with the lesion.
The presentation of the results in this study is highly confusing; 21 AM restorations were reportedly not evaluated at 24 months because of
recurrent caries (n=7), fracture (n=7) or censored (exfoliated or failed to attend, n =7).
Due to improper cavity design with recurrent caries underlying amalgam restoration leading to fracture of the restoration.
Another survey19 which was also done in Pakistan showed that recurrent caries was present underneath previous restoration.
The tooth was followed for a year-every three monthsin which no
recurrent caries, no dislodgment nor fracture of the restoration and no root fracture.
Recurrent caries was the reason given for replac- ing fifty nine amalgam restorations (2.82 Percent), complete dislodgement of amalgam restorations accounted for 1.3 Percent (27 amalgam restorations) of the total restora- tions placed; eight (0.38 Percent) were replaced because of overhanging amalgam while other reasons made up the rest (1.53 Percent).
Clinical diagnosis of
recurrent caries; J Am Dent Assoc, Vol 136, No 10, 1426-33.