The effect of different surface preparation techniques on the survival probabilities of orthodontic brackets bonded to nanofill composite resin
| Autor: | Rochaya Chintavalakorn, Walaitip Jermwiwatkul, Nuntinee Nanthavanich, Nita Viwattanatipa |
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| Rok vydání: | 2010 |
| Předmět: |
Dental Stress Analysis
Materials science Orthodontic Brackets Surface Properties Composite number Orthodontics Dental bonding engineering.material Composite Resins Abrasion (geology) Nanocomposites chemistry.chemical_compound Random Allocation Hydrofluoric acid Shear strength Dental Etching Composite material Likelihood Functions Dental Bonding Diamond Survival Analysis Air Abrasion Dental chemistry engineering Aluminium oxide Microscopy Electron Scanning Shear Strength |
| Zdroj: | Journal of orthodontics. 37(3) |
| ISSN: | 1465-3133 |
| Popis: | To analyze the survival probabilities of different surface preparation techniques for bonding brackets to nanofill composite resin.In vitro, laboratory study.Mahidol University, Bangkok, Thailand.Thirty-five nanofill composite resin specimens/group were subjected to four surface preparation techniques as follows: (1) sandblast using aluminium oxide powder of 90 microm; (2) abrasion using diamond bur; (3) hydrofluoric acid etching for 2 min; and (4) 37% orthophosphoric acid etching for 30 s. Plastic conditioner was applied then brackets were bonded. Shear bond strength tests were carried out on a universal testing machine.Shear bond strength (MPa) and debonding force (N) were analyzed using Weibull analysis.The maximum stress and debonding force levels with a 95% probability of survival ranking from highest to lowest were: (1) sandblast group (4.2 MPa, 45.5 N); (2) diamond bur group (2.2 MPa, 25.3 N); (3) orthophosphoric group (1.9 MPa, 19.8 N); and (4) hydrofluoric group (0.8 MPa, 10.9 N). There was a significant difference in the adhesive remnant index scores between the surface preparation techniques (chi squared P0.001).Bonding orthodontic brackets to nanofill composite resin materials may result in lower bond strengths and special surface preparation techniques might be required to avoid increased numbers of bond failures. Surface treatment with sandblasting followed by plastic conditioner could increase the survival probability. The use of a diamond bur, orthophosphoric etching or hydrofluoric etching cannot be recommended. |
| Databáze: | OpenAIRE |
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