Microleakage around preventive composite fillings in loaded teeth

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Abstract
The microleakage around preventive composite fillings in human teeth subjected to mechanical loading and thermal cycling, and the influence of the consistency of the composite resin on the leakage was studied. The fissure enamel was partially removed without dentin exposure in 30 extracted maxillary premolars. The cavities were etched with phosphoric acid and filled with undiluted composite (Adaptic) or composite diluted with varying amounts of liquid resin (Adaptic Bonding Agent). Five teeth were not acid etched and served as a control group. All teeth were mechanically loaded and unloaded, simulating masticatory forces and subsequently thermally cycled between 2 dye solutions. Extensive leakage was seen around all fillings in the control group, while slight leakage, restricted to the feather-edge margin, was seen in 5 teeth with acid etched cavities. Of these, 3 contained undiluted composite fillings. Twenty teeth showed no leakage. Preventive composite filling provides good sealing of occlusal fissures, and the seal is resistant to those thermal and mechanical stresses which may be expected in vivo. The use of diluted composite resin in preventive composite fillings is recommended.

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