In vitro evaluation of an alternative method to bond molar tubes

Abstract

Despite the advances in bonding materials, many clinicians today still prefer to place bands on molar teeth. Molar bonding procedures need improvement to be widely accepted clinically.ObjectiveThe purpose of this study was to evaluate the shear bond strength when an additional adhesive layer was applied on the occlusal tooth/tube interface to provide reinforcement to molar tubes.Material and methodsSixty third molars were selected and allocated to the 3 groups: group 1 received a conventional direct bond followed by the application of an additional layer of adhesive on the occlusal tooth/tube interface, group 2 received a conventional direct bond, and group 3 received a conventional direct bond and an additional cure time of 10 s. The specimens were debonded in a universal testing machine. The results were analyzed statistically by ANOVA and Tukey’s test (α=0.05).ResultsGroup 1 had a significantly higher (p<0.05) shear bond strength compared to groups 2 and 3. No difference was detected between groups 2 and 3 (p>0.05).ConclusionsThe present in vitro findings indicate that the application of an additional layer of adhesive on the tooth/tube interface increased the shear bond strength of the bonded molar tubes.

An Ex-vivo Shear and tensile bond strengths of orthodontic molar tubes bonded using different techniques

“…In this study, SBS of the control group coincides with the results reported by others ( 2 , 4 , 5 , 7 ). The TBS value for the control group was considered adequate for clinical performance ( 3 ).…”

“…Few studies have tested alternative methods to decrease the failure rate of the bonded molar tubes. Pinzan-Vercelino et al ( 5 ) found that the SBS of bonded molar tubes increased when an additional layer of adhesive was applied to the occlusal part of the tooth/tube interface followed by 10 seconds of additional light-curing. Recently, Silva-Benitez et al ( 7 ) reported that the use of overetching and the combination of microabrasion and etching improves SBS of flourotic molars.…”

“…Similarly, Bishara et al ( 4 ) recorded 11.8±4.1 MPa for the tested molar tubes. Most recently, Pinzan-Vercelino et al ( 5 ) recorded a mean value of 12.53 MPa for the bonded molar tubes.…”

“…A variety of bonding protocols has been suggested to maximize the bond strength of the bonded attachments. These include application of silane agent, ( 6 ) application of additional layer of resin to the occlusal surface of tube/tooth interface, ( 5 ) overetchning and enamel micro-abrasion ( 7 , 8 ).…”

Estudo in vitro da resistência ao cisalhamento da colagem direta de tubos ortodônticos em molares

“…The results showed a statistically significant difference compared to the group that received reinforcement during bonding but were similar to the group that received the additional 10-second light-curing. 14 Proffit, Fields and Nixon 15 showed that in balanced faces, posterior teeth are subjected to greater masticatory forces, with forces of around 30 kg being exerted. In this study, the mean force in kilogram-force at the time of debonding the tubes in Group 1 was 23.69 kgf ( Since most of the factors involved in the procedure of directly bonding molar tubes cannot be changed by the orthodontist (salivation, difficult access to the bonding procedure, absence of uniform buccal surfaces and resin thickness, initial patient age and the occurrence of occlusal interference), 9 this alternative method proposed for performing this procedure seems to increase the clinical quality of the direct bonding of orthodontic tubes.…”