Microshear bond strength according to dentin cleansing methods before recementation.
OBJECTIVE
THE AIM OF THIS STUDY WAS TO DETERMINE THE EFFICIENCY OF ERBIUM, CHROMIUM: Yttrium-Scandium-Gallium-Garnet laser in different output powers for removing permanent resin cement residues and therefore its influence on microshear bond strength compared to other cleaning methods.


METHODS
90 extracted human molars were sectioned in 1 mm thickness. Resin cement was applied to surface of sliced teeth. After the removal of initial cement, 6 test groups were prepared by various dentin surface treatment methods as follows: no treatment (Group 1), ethylene diamine tetra acetic acid application (Group 2), Endosolv R application (Group 3), 1.25 W Erbium, Chromium:Yttrium-Scandium-Gallium-Garnet laser irradiation (Group 4), 2 W Erbium, Chromium:Yttrium-Scandium-Gallium-Garnet laser irradiation (Group 5) and 3.5 W Erbium, Chromium:Yttrium-Scandium-Gallium-Garnet laser irradiation (Group 6). The topography and morphology of the treated dentin surfaces were investigated by scanning electron microscopy (n=2 for each group). Following the repetitive cementation, microshear bond strength between dentin and cement (n=26 in per group) were measured with universal testing machine and the data were analyzed by Kruskal Wallis H Test with Bonferroni correction (P<.05). Fracture patterns were investigated by light microscope.


RESULTS
Mean microshear bond strength ± SD (MPa) for each group was 34.9 ± 17.7, 32.1 ± 15.8, 37.8 ± 19.3, 31.3 ± 12.7, 44.4 ± 13.6, 40.2 ± 13.2 respectively. Group 5 showed significantly difference from Group 1, Group 2 and Group 4. Also, Group 6 was found statistically different from Group 4.


CONCLUSIONS
2 W and 3.5 W Erbium, Chromium: Yttrium-Scandium-Gallium-Garnet laser application were found efficient in removing resin residues.
Department of Prosthodontics, Faculty of Dentistry, Near East University, Nicosia, Mersin, Turkey.
Simge
S
Taşar
Department of Prosthodontics, Faculty of Dentistry, Near East University, Nicosia, Mersin, Turkey.
Mutahhar Muhammed
MM
Ulusoy
Department of Prosthodontics, Faculty of Dentistry, Near East University, Nicosia, Mersin, Turkey.
Gökçe
G
Merıç
Er, Cr:YSGG laser; Microshear bond strength; Repetitive cementation