The Causes and Effects of Micro-leakage in Posterior Composite Restorations; How Can Dentists Minimize These Phenomena

The Causes and Effects of Micro-leakage in Posterior Composite Restorations; How Can Dentists Minimize These Phenomena

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CAUSES OF MICRO-LEAKAGE
Material
An article written by Bagis et al. compared micro-leakage between silorane-based resin composite and nanohybrid-based resin composite restorations. The results of the study concluded that the enamel and dentin margins for silorane-based resin composite restorations showed no leakage. The nano-hybrid-based resin composite restorations presented with varying levels of leakage. Applying the findings of this study, a clinician may want to consider use of a silorane-based resin composite to limit micro-leakage experienced by the patient.
Placement
Instrumentation
A study appearing in Operative Dentistry compared micro-leakage associated with a variety of instrument combinations used for composite placement. Four instrument combinations were assessed; a metal matrix with wooden wedge, a transparent matrix with reflective wedge, a metal matrix with wooden wedge and light tip, and a metal matrix with wooden wedge and bio-glass cylinder. The study found that exclusive use of a metal matrix with a wooden wedge, as compared to a transparent matrix and a reflective wedge, significantly increases marginal leakage. Using a conical tip, or other similar light-conducting instruments, significantly reduces micro-leakage to a level equivalent to that of a transparent matrix and reflective wedge. Applying the findings of this study, a clinician should no longer continue to solely use a metal matrix and wooden wedge.
Intermediary Flow layer
A study published in the Journal of Dentistry assessed cervical enamel micro-leakage with and without an intermediary flowable resin-based composite (RBC) layer for the incremental restoration of mesio-occluso-distal (MOD) cavities. Use of an intermediary flowable resin-based compo...


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