Abstract

PEREIRA NETO, João Sarmento; PORTO, Leonardo Valdetaro; MAGNANI, Maria Beatriz Borges de Araújo  and  SIQUEIRA, Vânia Célia Vieira de. Shear strength in vitro comparison in the "PAD" interface of dental resin/enamel. RFO UPF [online]. 2015, vol.20, n.1, pp. 11-16. ISSN 1413-4012.

Objective: The present study compared shear strength in the pad interface of resin/enamel with three materials usually used for bonding lingual brackets. Materials and method: Forty-five specimens were created with bovine incisors inserted in composite resin Transbond XT (3M Unitek, Monrovia, USA) to simulate the pads, which were divided in three groups: Group I - bonding with resin Sondhi Rapid Set (3M Unitek, Monrovia, USA); Group II - bonding with sealant Maximum Cure (Reliance Orthodontic Products, Itasca, USA); Group III - bonding with resin Natural Flow (Dfl, Ind. e Com., Rio de Janeiro, Brazil). After bonding, the specimens were stored in distilled water at 37 °C for 24 hours. Then, specimens were submitted to shear strength testing using an Instron Universal testing machine at 0.5 mm/minute speed. Data were submitted to Analysis of Variance and means to Tukey's test (5%). Results: Shear strength mean values were 17.28 Mpa for Group I, 18.63 Mpa for Group II, and 24.33 Mpa for Group III. The results found for Group III were statistically higher than groups I and II, which showed no statistical differences between each other. Conclusions: The Natural Flow resin showed higher shear strength among the three tested materials, followed by Maximum Cure sealant, and Sondhi Rapid Set resin respectively; all materials tested showed proper shear strength to meet clinical needs.

Keywords : Brackets.; Orthodontics.; Dental bonding..