MICROLEAKAGE OF 5 DENTINAL ADHESIVES

This study compared the microleakage characteristics of four dentinal adhesives against Scotchbond 2 as a control and discusses the results in light of recently reported bond strengths for these same materials. Dentin specimens from 100 caries-free extracted human molar teeth wer e used in a matched pair design. In each of the four test materials, 2 5 tooth sides were treated along with the matching control, subjected to 500 thermocycles (5 to 55-degrees-C), followed by AgNO3 dye penetra tion, specimen sectioning, and evaluation by low-power stereomicroscop y. Mean microleakage values were as follows (microns): Scotchbond Mult ipurpose, 498.0; All-Bond 2, 530.8; Syntac, 748.0; X-R Bond, 844.9; an d the Scotchbond 2 control (a composite score created by averaging fou r sets of 25 tooth sides), 1095.2. Paired t-tests showed that Scotchbo nd Multipurpose, Syntac, and All-Bond 2 had significantly lower microl eakage than the control (P = 0.0001); however, X-R Bond had no signifi cant difference from the control (P = 0.4634).