Ai. Abdalla et Cl. Davidson, EFFECT OF MECHANICAL LOAD CYCLING ON THE MARGINAL INTEGRITY OF ADHESIVE CLASS-I RESIN COMPOSITE RESTORATIONS, Journal of dentistry, 24(1-2), 1996, pp. 87-90
Objectives: The purpose of this study was to determine the effect of c
ycle loading on the sealing capacity of different adhesive systems in
Class I restorations in vitro. Methods: (1) Clearfil Liner Bond/Clearf
il Photo Posterior, (2) Scotchbond Multipurpose/Z100, (3) Syntac/Helio
molar, and (4) Gluma 2000/Pekalux were employed to restore Class I cav
ities in extracted human premolars and molars. For each test group, ha
lf of the specimens were subjected to mechanical loading at 125 N for
5000 cycles in a dye solution. After sectioning, dye penetration was a
ssessed. Results: Without loading, no specimen showed leakage, while l
oading did affect the sealing capacity of groups 3 and 4. Groups 1 and
2 showed no significant increase in leakage after the loading procedu
re. Conclusion: The results indicate that mechanical cycle loading can
adversely affect the interface of adhesive Class I resin composite re
storations unless hybridizing adhesive systems are used.