Relationship between microtensile bond strength and nanoleakage at the composite-dentin interface.
OBJECTIVE
This study evaluated the relationship between microtensile bond strength (microTBS) and occurrence of nanoleakage at the resin-dentin interface using the same specimens.


METHODS
Resin-dentin-bonded micro-specimens (sticks with a size of 300 microm x 300 microm x 8mm) were prepared using one of two material combinations (group I: Syntac classic/Tetric Ceram Cavifil: n=57; group II: Prime & Bond NT/Spectrum TPH: n=52). After immersion of the micro-specimens in 0.1% rhodamine-B solution for 1h, nanoleakage was imaged nondestructively using a confocal laser scanning microscope (CLSM). Then the specimens were subjected to a microTBS test.


RESULTS
For the influence of nanoleakage on microTBS with the Syntac classic/Tetric Ceram Cavifil group, the nonparametric Spearman correlation was 0.033 at p=0.805. For the Prime & Bond NT/Spectrum TPH group, the nonparametric Spearman correlation was 0.077 at p=0.584.


CONCLUSIONS
The degree of nanoleakage had no influence on microtensile bond strength for the Syntac classic/Tetric Ceram Cavifil or for the Prime & Bond NT/Spectrum TPH group.
Ding
Paul G F
PG
Department of Conservative Dentistry, Clinic for Oral, Dental and Maxillofacial Diseases, University Hospital Heidelberg, Germany.
Wolff
Diana
D
Pioch
Thomas
T
Staehle
Hans Jörg
HJ
Dannewitz
Bettina
B
D000179:Acrylates / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003763:Dental Leakage / Q000145:classification*; D003764:Dental Materials / Q000737:chemistry*; D003804:Dentin / Q000648:ultrastructure*; D017220:Dentin-Bonding Agents / Q000737:chemistry; D005456:Fluorescent Dyes; D006801:Humans; D008422:Materials Testing; D018613:Microscopy, Confocal; D011109:Polymethacrylic Acids / Q000737:chemistry; D019279:Resin Cements / Q000737:chemistry; D012235:Rhodamines; D013314:Stress, Mechanical; D013499:Surface Properties; D013718:Tensile Strength
D000179:Acrylates; D003188:Composite Resins; D003764:Dental Materials; D017220:Dentin-Bonding Agents; D005456:Fluorescent Dyes; D011109:Polymethacrylic Acids; C425843:Prime and Bond NT; D019279:Resin Cements; D012235:Rhodamines; C420128:Spectrum composite resin; C078484:Syntac dentine adhesive; C467914:TPH spectrum; C121818:Tetric ceram; C040415:heliobond; C029773:rhodamine B