Journal of Iranian Dental Association
J Iran Dent Assoc
Medical Sciences
http://jida.ir
23
journal23
2383-3041
10.52547/jida
en
jalali
1395
4
1
gregorian
2016
7
1
28
3
online
1
fulltext
en
Shear Bond Strength of Metal brackets to Zirconia Treated with Er:YAG Laser Sandblasting and Silane
Orthodontics
Orthodontics
Original
Original
<div><strong style="text-align: justify;">Background and Aim: </strong><span style="text-align: justify;">Application of zirconia ceramics has increased. Since the commonly used surface treatment for porcelain, i.e. acid etching is not efficient for zirconia surfaces, evaluation of other surface treatment methods for zirconia is important. The aim of this study was to compare the shear bond strength (SBS) of metal brackets to zirconia treated with different powers of Er:YAG laser, sandblasting and silane.</span></div>
<div style="text-align: justify;"><strong>Materials and Methods: </strong>In this experimental study, five blocks of 3 mol% yttria stabilized tetragonal zirconia ceramics (3Y-TZP-A) were cut into small cubes. After the sintering process, 72 samples were assigned to six groups (n=12). The first group did not receive any surface treatment. The second, third and fourth groups were irradiated with Er:YAG laser with 1.5 W (150 mJ), 2.5 W (250 mJ) and 3 W (300 mJ) powers, respectively in a long pulse mode for 20 seconds. The samples in the fifth group were sandblasted. The sixth group samples were silanized. After bonding of brackets to the samples, they were stored in distilled water, thermocycled and their SBS was measured by a universal testing machine. Mode of failure was assessed by a stereomicroscope.<br>
<strong>Results: </strong>The SBS of brackets to zirconia in groups one to six was 0.31±0.23, 0.51±0.14, 1.11 ±0.40, 3.32±1.52, 9.5±2.99 and 3.88±2.20 MPa, respectively. ANOVA revealed a significant difference among the six groups. Tamhane’s test showed that the SBS in group five was significantly higher than that in the other groups. Bond failure occurred at the adhesive/zirconia interface in all groups.<br>
<strong>Conclusion: </strong>Surface treatment of zirconia with sandblasting provided appropriate bond strength of brackets for clinical applications. But, Er:YAG laser and silane did not create sufficient SBS to zirconia surfaces.<br>
</div>
Lasers, Shear Strength, Orthodontic Brackets, Zirconium
110
117
http://jida.ir/browse.php?a_code=A-10-1-862&slc_lang=en&sid=1
Mohammad Hashem
Hosseini
2300319475328460020491
2300319475328460020491
No
Assistant Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran AND Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
Fatemeh
Gorjizadeh
fatemegorjizade@gmail.com
2300319475328460020492
2300319475328460020492
Yes
Postgraduate Student, Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
Ardavan
Etemadi
2300319475328460020493
2300319475328460020493
No
Assistant Professor, Laser Research Center of Dentistry, Dental Research Institute, Tehran University of Medical Sciences, Tehran, Iran
Pedram
Baghaeian
2300319475328460020494
2300319475328460020494
No
Postgraduate Student, Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran