Orthodontics
Mahdjoube Goldani Moghadam; Hanieh Kazemi; Mohadese Bani Asadi
Abstract
Aim: This study aims to compare the shear bond strength (SBS) of different combinations of retainer wires and enamel preparation methods.Methods: A total of 180 extracted mandibular bovine incisors were randomly divided into nine groups of 20 paired teeth each. Three techniques were employed to prepare ...
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Aim: This study aims to compare the shear bond strength (SBS) of different combinations of retainer wires and enamel preparation methods.Methods: A total of 180 extracted mandibular bovine incisors were randomly divided into nine groups of 20 paired teeth each. Three techniques were employed to prepare the enamel: acid etches only, Er:YAG laser before acid etch, and sandblast before acid etch. The retainer wires, including Bond-A-Braid, GAC Wildcat Twistflex Wire, and TruForce coaxial wire, were bonded with the adhesive Transbond LR and SBS values were measured. The two-way ANOVA test was used to evaluate the effect of the conditioning method in combination with the retainer wire type and the interaction of two variables. Pairwise comparisons were done using the Tukey post hoc test. A value of P≤0.05 was considered to be significant for all statistical tests.Results: The highest shear bond strength value was found for sandblasted surface bonded with Bond-A-Braid wire. The combination of acid-etched enamel/GAC Wildcat Twistflex wire revealed the lowest value of the SBS. Statistically significant differences did not exist for the Adhesive Remnant Index (ARI) scores among the study groups.Conclusion: Sandblasting and laser irradiation before the acid etching significantly increased the SBS. Differences in the SBS values of different wires were insignificant.
Roya Naseh; Nima Rahnamoon; Maryam Afshari
Abstract
Background: Assure Universal Bonding Resin is capable of providing a strong bond between orthodontic attachments and amalgam surfaces.
Objectives: This study sought to assess the shear bond strength of orthodontic attachments to amalgam surfaces using Assure Universal Bonding Resin after different surface ...
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Background: Assure Universal Bonding Resin is capable of providing a strong bond between orthodontic attachments and amalgam surfaces.
Objectives: This study sought to assess the shear bond strength of orthodontic attachments to amalgam surfaces using Assure Universal Bonding Resin after different surface treatments.
Methods: This in-vitro experimental study was conducted on 120 amalgam samples in eight groups of surface roughening with diamond bur, sandblasting with aluminum oxide particles, Er, Cr: YSGG laser irradiation and polishing-only. Molar buccal tubes were bonded to amalgam surfaces using Assure primer and Transbond Plus light-cure composite. Half the samples were immediately subjected to shear bond strength testing while the remaining half were incubated at 37°C for one week, thermocycled (1000 cycles) and were then subjected to shear bond strength test. One-way ANOVA was applied to compare the bond strength of the groups and Tukey’s test was used for pairwise comparisons. The adhesive remnant index (ARI; 4 point-scale) was also determined in the groups and the results were analyzed using the Kruskal-Wallis test. Results: Significant differences were noted in shear bond strength of attachments following the application of Assure among different surface treatment modalities (P < 0.001); the highest bond strength was noted in sandblasted group followed by laser, bur and polishing, respectively. Aging had no significant effect on bond strength.
Conclusions: Sandblasting and irradiation of Er, Cr: YSGG laser provided sufficiently high bond strength between amalgam and attachments following the application of Assure. Diamond bur and polishing did not provide adequately high bond strength.
