Abstract
Aim. The aim of this study is to evaluate the shear bond strength of nanocomposite to stainless steel crowns using a new universal bonding system. Material and Methods. Eighty (80) stainless steel crowns (SSCs) were divided into four groups (20 each). Packable nanocomposite was bonded to the lingual surface of the crowns in the following methods: Group A without adhesive (control group), Group B using a new universal adhesive system (Scotchbond Universal Adhesive, 3M ESPE, Seefeld, Germany), and Group C and Group D using two different brands of single-bottle adhesive systems. Shear bond strengths were calculated and the types of failure also were recorded. Results. The shear strength of Group B was significantly greater than that of other groups. No significant differences were found between the shear bond strengths of Groups C and D. The control group had significantly lower shear bond strength (P < 0.05) to composite than the groups that utilized bonding agents. Conclusion. Composites bonding to stainless steel crowns using the new universal bonding agent (Scotchbond Universal Adhesive, 3M ESPE, Seefeld, Germany) show significantly greater shear bond strengths and fewer adhesive failures when compared to traditional single-bottle systems.
Highlights
Stainless steel crowns (SSCs) are most commonly used for full coverage restoration of posterior primary teeth [1,2,3]
Given the better bonding of nanocomposites to stainless steel crowns than conventional composites [16], this study aimed to evaluate the bonding of nanocomposites to stainless steel crowns using a universal bonding system
The control group had significantly lower shear bond strength to composite than the groups that utilized bonding agents
Summary
Stainless steel crowns (SSCs) are most commonly used for full coverage restoration of posterior primary teeth [1,2,3]. For children who presented with large, multisurface carious lesions of the primary teeth, the American Academy of Pediatric Dentistry recommended the full coverage of crowns using SSCs [5]. Despite their high success rate, this proven restoration often fails to meet the esthetic demands of patients and their parents [3, 6]. The shape of an esthetic SSC cannot be altered, because this would change the rigid metal coping structure beneath the somewhat brittle composite, leading to the possibility of future fracture of the composite [10]. There is documentation of the repair of fractured esthetic crowns [11], replacement of the crown is often the only method of managing such failures [9]
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