UNASSIGNED: Summary OBJECTIVE : To test the null hypothesis that neither the flexural properties of orthodontic adhesive resins nor the enamel pre-treatment methods would affect metal bracket debonding behaviours, including enamel @entity174 . MATERIALS AND METHODS: A dimethacrylate-based resin (Transbond XT, TX) and two @entity68745 ( @entity68745 )-based resins (Super-Bond C_B, SB; an experimental light-cured resin, EXP) were tested. Flexural strength and flexural modulus for each resin were measured by a three-point-bending test. Metal brackets were bonded to @entity1 enamel pretreated with total-etch (TE) or self-etch adhesive using one of the three resins (a total of six groups, n = 15). After 24 hours of storage in water at 37  C, a shear bond strength (SBS) test was performed using the wire loop method. After debonding, remaining resin on the enamel surfaces and occurrence of enamel @entity174 were assessed. Statistical significance was set at P < 0.05. RESULTS: The two @entity68745 resins exhibited substantially lower flexural strength and modulus values than the TX resin. The mean SBS values of all groups (10.15-11.09MPa) were statistically equivalent to one another (P > 0.05), except for the TE-TX group (13.51MPa, P < 0.05). The two EXP groups showed less resin remnant. Only in the two TX groups were enamel fractures observed (three cases for each group). LIMITATIONS: The results were drawn only from ex vivo experiments. CONCLUSIONS: The hypothesis is rejected. This study suggests that a more flexible @entity68745 resin is favourable for avoiding enamel @entity174 during metal bracket debonding.

Effect of adhesive resin flexibility on enamel XXXX during metal bracket debonding: an ex vivo study.

@entity1 :: ('9606', 'Species') :: ['human'] @entity68745 :: ('MESH:C562803', 'Disease') :: ['MMA', 'methyl methacrylate'] @entity174 :: ('MESH:D050723', 'Disease') :: ['fracture']
@entity174 :: (MESH:D050723,Disease) :: ['fracture']
