Effects of thermocycling and light source on the bond strength of metallic brackets to bovine teeth

Brazilian Dental Journal

Ana Rosa Costa²  Américo Bortolazzo Correr²  Regina Maria Puppin-rontani¹  Silvia Amélia Scudeler Vedovello¹  Heloísa Cristina Valdrighi¹  Lourenço Correr-sobrinho²  Mário Vedovello Filho¹ 

[1] ,University of Campinas Piracicaba Dental School Dental Materials DivisionPiracicaba SP ,Brazil

关键词: Light source;    shear bond strength;    bonding;    thermocycling;   

DOI  :  10.1590/S0103-64402011000600008

来源: SciELO

【 摘 要 】

This study evaluated the effects of thermocycling and different light sources on the bond strength of metallic brackets to bovine tooth enamel using an adhesive resin. Bovine teeth were etched with 35% phosphoric acid gel for 20 s. After application of primer, metallic brackets were bonded to the buccal surface using Transbond XT, forming 8 groups (n=20), depending on the light source used for photoactivation (AccuCure 3000 argon laser - 20 s, Apollo 95E plasma arc - 12 s, UltraLume 5 LED - 40 s and XL2500 halogen light - 40 s) and experimental conditions without (Groups 1 to 4) or with thermocycling (Groups 5 to 8). Shear bond testing was carried out after 24 h of distilled water storage (Groups 1 to 4) or storage and thermocycling in distilled water (groups 5 to 8; 1,500 cycles - 5o/55oC). Data were subjected to two-way ANOVA and Tukey’s test (α=0.05). The Adhesive Remnant Index (ARI) was evaluated at ×8 magnification. No significant differences (p>0.05) in bond strength were found when the conditions without and with thermocycling were compared for any of the light sources. No significant differences (p>0.05) in bond strength were found among the light sources, irrespective of performing or not thermocycling. There was a predominance of ARI scores 1 in all groups. In conclusion, light sources and thermocycling had no influence on the bond strength of brackets to bovine enamel.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License