Orthodontic Research Today is a free monthly online journal that collates and summarizes the latest research about Orthodontic, including details on braces, retainers, treatment.

Investigation of Shear-Peel Bond Strength of Orthodontic Brackets on Enamel after Using Pro Sealtrade mark.

Paschos E, Okuka S, Ilie N, Huth KC, Hickel R, Rudzki-Janson I

Department of Orthodontics, Ludwig-Maximilian-University Munich, Munich, Germany.

AIM: The aim of this investigation was to ascertain whether the use of a fluoride-releasing, light-curing sealant (Pro Sealtrade mark, Reliance Orthodontic Products, Itasca, IL, USA) results in differences in shear-peel bond strength when teeth are etched via the conventional acid-etching method and with self-etching primers (SEP), respectively. We also examined whether Pro Sealtrade mark functions as a substitute for the bonding agents recommended by the manufacturers. MATERIAL AND METHODS: To carry out this study, we randomly allocated 300 extracted molars (ISO 11405) into twelve groups (n = 25). The brackets used (Victory Seriestrade mark, Twin UBi 0T/0A .022, 3M Unitek, Seefeld, Germany) were bonded using the same layer thickness of adhesive. The teeth were then stored for 24 h in de-ionized water (37 degrees C) and subsequently thermocycled. The brackets were debonded using a universal testing machine with a crosshead speed of 0.5 mm/min. For statistical evaluation we used the one-way analysis of variance (ANOVA [alpha = 0.05]) and the post hoc Tukey test and Weibull analysis. RESULTS: We could establish that the use of Pro Sealtrade mark does not have a negative influence on shear-peel bond strength. When the compomer Assuretrade mark was used, Pro Sealtrade mark even led to an increase in shear-peel bond strength, especially when it was applied using the bonding agent recommended by the manufacturer. The highest Weibull modulus (m) was found for the self-etching primer IDEAL 1((R)) without using Pro Sealtrade mark (m = 6.5) and the lowest for First Steptrade mark SEP when using Pro Sealtrade mark (m = 2.2). There were also clear differences in characteristic shear-peel bond strength (sigma(0)) within some of the groups investigated. CONCLUSIONS: Although the statistical evaluation showed no significant negative influence on the shear-peel bond strength either when Pro Sealtrade mark was used in addition, or when that fluoride-releasing, light-curing sealant was substituted for the bonding agent recommended by the manufacturer, the Weibull analysis showed that the use of Pro Sealtrade mark in combination with SEP resulted in bond strength values that were less reliably reproducible.

Published 31 May 2006 in J Orofac Orthop, 67(3): 196-206.
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