Microleakage of XP Bond in Class II cavities after artificial aging.
OBJECTIVE
To determine the microleakage of etch and rinse adhesives.


METHODS
Standardized Class II cavities were cut in 40 human molars with one proximal box limited within enamel and one proximal box extending into dentin. Teeth were assigned randomly to 5 groups (n = 8) and restored with incrementally placed composite restorations. Five combinations were tested: G1 = XP Bond + Ceram X Mono, G2 = Syntac Classic + Tetric EvoCeram, G3 = Scotchbond 1 XT + Z250, G4 = P&B NT + Ceram X mono, G5 = Optibond Solo Plus + CeramX Mono. After finishing and polishing, teeth were stored for 48 h in water at 37 degrees C before being subjected to artificial aging by thermal stress (5/55 degrees C, 2000x, 30 s) and mechanical loading (50 N, 50,000x). Teeth were isolated with nail varnish and immersed in 5% methylene blue for 1 h. After sectioning, specimens were evaluated for leakage (ordinal scale: 0 to 4) at enamel and dentin margins under a stereomicroscope. Results were analyzed using the Kruskal-Wallis H-test and Mann-Whitney U-test (p < 0.05).


RESULTS
Statistical analysis showed significant differences among the groups in both enamel and dentin. Mean ranks (H-test) were: enamel: G2 (64.44) < G1 (66.69) < G4 (74.88) < G3 (98.25) and G5 (98.25); dentin: G3 (65.53) < G1 (74.42) < G4 (81.09) < G2 (81.84) < G5 (99.61).


CONCLUSIONS
Microleakage of XP Bond is at the same level as or even better than other etch-and-rinse adhesives.
Manhart
Jürgen
J
Department of Restorative Dentistry, Ludwig Maximilians University, Munich, Germany. manhart@manhart.com
Trumm
Cordula
C
D003737:Dental Cavity Preparation; D003743:Dental Enamel; D003763:Dental Leakage; D003793:Dental Restoration, Permanent; D003804:Dentin; D006801:Humans