Effects of diode laser and MTAD on the push-out bond strength of mineral trioxide aggregate-dentin interface.
OBJECTIVE
The aim of this in vitro study was to evaluate the effects of diode laser, MTAD(™) and laser plus MTAD on the push-out bond strength of mineral trioxide aggregate (MTA)-dentin.


BACKGROUND
MTA has been used widely, especially in root canal therapies (RCT); however, the effect of different final treatments during RCT has been questioned regarding the retention characteristic of this cement-based material.


METHODS
Forty single-rooted human teeth were prepared into dentin slices and drilled to form canal spaces. Samples were divided into four groups of 10 in each (n=10). In groups A and B, diode laser irradiations were performed, and then MTA was placed inside the canal spaces and incubated at 37 °C for 7 days. After incubation, dentin slices in groups B and C were immersed in Biopure MTAD, and the last group served as control without any treatment. The push-out bond strengths were then measured by using a universal testing machine.


RESULTS
The means±standard deviations of push-out bond strength were 6.74±0.48, 5.95±0.40, 6.86±0.66, and 7.88±0.37 for groups A (laser), B (laser plus MTAD), C (MTAD) and D (control), respectively. One-way analysis of variance (ANOVA) test revealed significant differences among the groups (p<0.0001). Tukey's test did not show any significant difference between groups A and C (p=0.93). However, these differences were significant between groups A and B (p=0.006) and between groups B and C (p=0.001).


CONCLUSIONS
The results of this study indicated that either diode laser or MTAD can lower the bond strength of MTA-dentin, and that diode laser irradiations plus MTAD might affect MTA bond to dentin negatively.
Craniofacial Research Center, Department of Dental Materials, Islamic Azad University, Tehran, Iran. saghiri@gmail.com
Mohammad Ali
MA
Saghiri
Franklin
F
Garcia-Godoy
Mehrdad
M
Lotfi
Hadi
H
Ahmadi
Armen
A
Asatourian
D017607:Aluminum Compounds / Q000737:chemistry / Q000528:radiation effects*; D000704:Analysis of Variance; D017610:Calcium Compounds / Q000737:chemistry / Q000528:radiation effects*; D019245:Compressive Strength; D001840:Dental Bonding / Q000379:methods*; D003799:Dental Stress Analysis; D003804:Dentin / Q000528:radiation effects*; D004338:Drug Combinations; D006801:Humans; D066298:In Vitro Techniques; D054023:Lasers, Semiconductor / Q000627:therapeutic use*; D010087:Oxides / Q000737:chemistry / Q000528:radiation effects*; D012387:Root Canal Filling Materials / Q000737:chemistry / Q000528:radiation effects*; D018915:Root Canal Preparation / Q000379:methods; D017640:Silicates / Q000737:chemistry / Q000528:radiation effects*
D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; C086631:mineral trioxide aggregate