Marginal integrity and microleakage of direct and indirect composite inlays: SEM and stereomicroscopic evaluation.
The aim of this study was to evaluate the microleakage of direct and indirect composite inlays by stereomicroscopy and scanning electron microscopy (SEM). Thirty bovine incisors were ground to obtain an incisal platform, simulating the occlusal surface of a human molar. Each tooth received two 8 degrees proximal cavities with cervical finishing line prepared in dentine or enamel. One of the cavities was filled with Filtek Z250/Single Bond, using the direct technique, and the other was filled with with Solidex/Rely X ARC/Single Bond, using the indirect technique. The samples were stored in water at 37 degrees C for 24 hours and placed in a 50% silver nitrate solution for 6 hours in a dark container. Next, the samples were washed under running water, immersed in a developing solution and exposed to fluorescent light for 12 hours. The teeth were then severed and evaluated for dye penetration by stereomicroscopy and SEM. There were no significant differences between the direct and indirect techniques for the cervical finishing line in enamel, but for the finishing line in dentin, the indirect technique allowed less microleakage than the direct technique. SEM analysis showed leakage similar to that observed by stereomicroscopic analysis. The use of stereomicroscopic and SEM evaluations improves microleakage analysis.
Soares
Carlos José
CJ
Dental School at Piracicaba, State University of Campinas.
Celiberto
Leonardo
L
Dechichi
Paula
P
Fonseca
Rodrigo Borges
RB
Martins
Luis Roberto Marcondes
LR
D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry / Q000592:standards*; D003737:Dental Cavity Preparation / Q000592:standards*; D003763:Dental Leakage / Q000175:diagnosis* / Q000517:prevention & control; D003804:Dentin / Q000737:chemistry / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry* / Q000592:standards; D007180:Incisor / Q000737:chemistry / Q000648:ultrastructure; D007284:Inlays / Q000379:methods* / Q000592:standards; D008027:Light; D008853:Microscopy / Q000379:methods; D008855:Microscopy, Electron, Scanning; D018709:Statistics, Nonparametric; D014867:Water
D003188:Composite Resins; D017220:Dentin-Bonding Agents; D014867:Water