Affiliation:
1. Shahid Beheshti University of Medical Sciences, Iran; Shahid Beheshti University of Medical Sciences, Iran
2. Shahid Beheshti University of Medical Sciences, Iran
3. , Iran
Abstract
ABSTRACT Introduction: It is recently suggested that titanium dioxide (TiO2) nanoparticles can be added to bracket luting agents in order to reduce bacterial activity and protect the enamel. However, it is not known if this addition can affect the shear bond strength (SBS) below clinically acceptable levels. Therefore, this study examined this matter within a comprehensive setup. Methods: This in vitro experimental study was conducted on 120 extracted human premolars randomly divided into four groups (n=30): in groups 1 and 2, Transbond XT light-cured composite with or without TiO2 was applied on bracket base; in groups 3 and 4, Resilience light-cured composite with or without TiO2 was used. Brackets were bonded to teeth. Specimens in each group (n=30) were divided into three subgroups of 10 each; then incubated at 37°C for one day, one month, or three months. The SBS and adhesive remnant index (ARI) were calculated and compared statistically within groups. Results: The SBS was not significantly different at one day, one month or three months (p>0.05) but composites without TiO2 had a significantly higher mean SBS than composites containing TiO2 (p<0.001). The SBS of Transbond XT was significantly higher than that of Resilience (p<0.001). No significant differences were noted in ARI scores based on the type of composite or addition of TiO2 (p>0.05). Conclusions: Addition of TiO2 nanoparticles to Transbond XT decreased its SBS to the level of SBS of Resilience without TiO2; thus, TiO2 nanoparticles may be added to Transbond XT composite for use in the clinical setting.
Subject
Oral Surgery,Orthodontics
Reference45 articles.
1. The influence of adding modified zirconium oxide-titanium dioxide nano-particles on mechanical properties of orthodontic adhesive an in vitro study;Felemban NH;BMC Oral Health,2017
2. A review of direct orthodontic bonding;Reynolds I;Br J Orthod,1975
3. Effect of resin-removal methods on enamel and shear bond strength of rebonded brackets;Eminkahyagil N;Angle Orthod,2006
4. Adhesives for fixed orthodontic brackets;Mandall NA;Cochrane Database Syst Rev,2003
5. Failure analysis enamel fracture after debonding orthodontic brackets;Chen CS;Angle Orthod,2008
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