Ayoub Pahlavan1, Mobin Mehmanchi2, Ladan Ranjbar Omrani3, Nasim Chiniforush4. 1. Department of Operative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. 2. Dental Students' Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. 3. Department of Operative Dentistry and Dental Research Center, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. 4. Laser Research Center of Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
Abstract
INTRODUCTION: The aim of this study was to assess shear bond strength of composite to dentin after air abrasion and laser treatment. METHODS: 40 human extracted molars divided into 4 groups (n=10) received the following treatments. Group 1: carbide bur, Group 2: air abrasion with aluminum oxide 50 μm, Group 3: irradiated with Erbium-Doped Yttrium Aluminum Garnet (Er: YAG) laser (150 mJ/20Hz), Group 4: irradiated with Er:YAG laser (150 mJ/20Hz)+ air. Specimens in all groups were chemically etched with phosphoric acid 37% and treated with bonding agent (single bond 3M). Then, composite build-up was performed by tygon tube. After storage in distilled water at 37°c for one week, all specimens were subjected to a shear bond strength test with universal testing machine. Data were analyzed with ANOVA and T-Test. RESULTS: The mean and standard deviation of shear bond strength of the 4 groups were 20.8±6.76, 14.98±3.98, 11.43±4.36 and 14.95± 3.18 MPa, respectively. CONCLUSION: Air abrasion after laser treatment improved the shear bond strength.
INTRODUCTION: The aim of this study was to assess shear bond strength of composite to dentin after air abrasion and laser treatment. METHODS: 40 human extracted molars divided into 4 groups (n=10) received the following treatments. Group 1: carbide bur, Group 2: air abrasion with aluminum oxide 50 μm, Group 3: irradiated with Erbium-Doped Yttrium Aluminum Garnet (Er: YAG) laser (150 mJ/20Hz), Group 4: irradiated with Er:YAG laser (150 mJ/20Hz)+ air. Specimens in all groups were chemically etched with phosphoric acid 37% and treated with bonding agent (single bond 3M). Then, composite build-up was performed by tygon tube. After storage in distilled water at 37°c for one week, all specimens were subjected to a shear bond strength test with universal testing machine. Data were analyzed with ANOVA and T-Test. RESULTS: The mean and standard deviation of shear bond strength of the 4 groups were 20.8±6.76, 14.98±3.98, 11.43±4.36 and 14.95± 3.18 MPa, respectively. CONCLUSION: Air abrasion after laser treatment improved the shear bond strength.
Entities:
Keywords:
Er-YAG laser; dental air abrasion; dentin