Influence of Modifying the Resin Coat Application Protocol on Bond Strength and Microleakage of Metal Orthodontic Brackets

Abstract

SBS was significantly improved with curing of the coat and adhesive separately, while it was not adversely affected when the coat and adhesive were cured simultaneously. Using the coat with either protocol significantly reduced the microleakage.

Microleakage under ceramic flash-free orthodontic brackets after thermal cycling

“…Compared with the mean microleakage under stainless steel brackets, the mean values under our Flash-Free group were comparable with those cured by a plasma arc light curing unit 6 and less than those observed by Abdelnaby et al, 2 Arhun et al, 3 or Arikan et al 5 The mean microleakage under stainless steel brackets bonded with RMGI was greater than the values found in this study, 10 but most of the results from previously published studies 4,6,7,10 demonstrate less microleakage beneath stainless steel brackets than the values observed in our Flash-Free group. Comparison of microleakage measurements between various studies can be unreliable.…”

“…1 Microleakage of oral fluids and bacteria underneath orthodontic brackets ultimately contributes to the development of white spot lesions 1 (WSLs) and can reduce shear bond strength. 2,3 Microleakage under orthodontic brackets has been studied extensively using different bracket systems, 3,4 light curing units, 1,5,6 bonding methods, [7][8][9] and adhesives. 2,3,10 Unfortunately, there is minimal agreement among clinicians which method of bonding and material consistently allows the least microleakage.…”

“…2,3 Microleakage under orthodontic brackets has been studied extensively using different bracket systems, 3,4 light curing units, 1,5,6 bonding methods, [7][8][9] and adhesives. 2,3,10 Unfortunately, there is minimal agreement among clinicians which method of bonding and material consistently allows the least microleakage. Metallic brackets 3 bonded with self-etching primers 4 or resin-modified glass ionomer 10 (RMGI) displayed decreased microleakage compared with ceramic brackets and traditional etch/liquid primer, while conventional adhesive appears to reduce microleakage regardless of bracket type.…”

Decalcification prevention around orthodontic brackets bonded to bleached enamel using different topical agents

“…This probably attributed to the ability of Ortho-Choice Ortho-Coat to fluoride releasing which encourages the formation of CaF 2 and fluorapatite that enhance remineralization of the enamel [29]. In addition, Ortho-Choice Ortho-Coat acts as a barrier around the bracket which may prevent the entry of saliva and oral fluid beneath the bracket and it provides smooth surface which prevents accumulation of dental plaque [12]. …”

“…Unlike the former one, it delivers ACP to enamel to encourage the formation of hydroxyapatite (HAP) to enhance remineralization and thus prevents the loss of enamel due to demineralization [11]. On the other hand, fluoride-releasing, light-cured resin coat have additional advantages as they form a mechanical barrier between plaque and the enamel surface under and around orthodontic brackets which can be added before or after bracket bonding [12]. …”