Jundishapur Scientific Medical Journal

Jundishapur Scientific Medical Journal

Comparision of the Shear Bond Strength of Orthodontic Brackets to Restorated Teeth by Methacrylate Based and Silorane Based Composite with Different Surface Treatment

Document Type : Original Article

Authors
Mashaallah Khanehmasjedi 1
Azadeh Ghaemi 2
Vahid Nourollahi Fard 3
Masumeh Behzadian 4
Samaneh Khanehmasjedi 5
1 Associated Professor of Orthodontics.Department of Orthodontics, Faculty of Dentisty, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
2 Assistance Professor of Operative and Esthetic DentistryDepartment of Operative and Esthetic Dentistry, Faculty of Dentistry, Ahvaz jundishapur University of Medical Sciences, Ahvaz, Iran.
3 Postgraduate Student of Orthodontics.Department of Orthodontics, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
4 Postgraduate Student of Restorative Dentistry. Department of Postgraduate Student of Restorative dentistry, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
5 Dental Student. Dental Student, Faculty of Dentistry, Ahvaz Jundishapur University of Medical Sciences, Avaz, Iran.
Abstract
Background and Objective: This study compared shear bond strength of metal brackets to the teeth restored with silorane and methacrylate-based composites after different surface treatments.
Subjects and Methods:After cavity preparation on the buccal surfaces of 112 acrylic central teeth and etching; the specimens were restored with Filtek Z-250 (methacylate base) or Filtek P-90 (silorane base) composites. Surface treatments were done by the diamond bur+acid etch, diamond bur+acid etch+silane, air abrasion and air abrasion+silane. The brackets were bonded to the teeth and after thermal cycles; shear bond strength of the brackets to composites were calculated by the universal testing machine. Data were analyzed with one-sided ANOVA and Tukey test was used for paired comparison regarding surface treatments. Non parametric Kruscal-Wallis test was used for evaluation of ARI index.
Results: The mean shear bond strength of brackets to teeth restored with Filtek Z-250 after treatments of diamond bur+acid etch, diamond bur+acid etch+silane, air abrasion and air abrasion+silane were 16.36±5.32,13.11±4.08,12.74±5.21and 13.16±3.82 MPa respectively. The values for the Filtek P-90  were 11.7±3.54, 8.2±3.25, 10.41±2.25 and 10.56±3.04 MPa. In all treatment methods, adequate bond strengths created between the brackets and composite surfaces. On the Filtek P-90, bond strength for diamond bur+acid etch was significantly more than diamond bur+acid etch+silane (P<0.02).
Conclusion: Bond strength of the brackets to the silorane in relation to methacrylate was lower but acceptable. For this reason and due to lower remaining adhesive after debonding; the bonding of brackets to the teeth restored with silorane was acceptable in all methods.
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Jundishapur Scientific Medical Journal
Volume 15, Issue 2 - Serial Number 101
May and June 2016
Pages 174-157

  • Receive Date 13 April 2015
  • Revise Date 29 November 2015
  • Accept Date 04 April 2016