Preparation of the Stainless Steel Crowns Thus a total of 80 stainless steel crowns were divided into four groups for the purpose of this study. The minimum required sample for the one-way ANOVA and post-hoc test, with alpha of 0.05, was 20 samples in each group. The power of the sample was calculated using the G-Power 3.1.3 power analysis software (Universtät Kiel, Germany). To avoid any chance of incompatibility of the bonding agent with the composite, each bonding agent was tested with a resin manufactured by the same manufacturer (ZX350, 3M ESPE Ceram-X mono, Dentsply). The bond strength obtained was compared to that of using two currently available dentin bonding agents Adaper Single Bond Plus (3M ESPE, Seefeld Germany) and Prime & Bond NT (Dentsply, Lichtenstein). Paul, MN, USA) using a new universal bonding system Scotchbon (Universal Adhesive, 3M ESPE, Seefeld, Germany). This study tested the bond strength of commercially available nanocomposite resins to pretrimmed, precontoured posterior stainless steel crowns, (3M, St. Given the better bonding of nanocomposites to stainless steel crowns than conventional composites, this study aimed to evaluate the bonding of nanocomposites to stainless steel crowns using a universal bonding system. However, to the researchers knowledge this system has not been tested on stainless steel crowns. This adhesive, developed for repairs in prosthodontic crowns, utilizes self-etch phosphorylated methacrylates that are believed to result in more efficacious bonding to metal as well as tooth structure. Recently, a dental adhesive has been developed for multipurpose bonding (Scotchbond Universal, 3M-ESPE, Seefeld, Germany). The use of such crowns has been restricted by the poor esthetics of the metal display due to inadequate bonding of the metal to composite. Ī treatment modality that allows for contouring of the crown as well as adequate retention is the chair-side veneering of composite to stainless steel crowns. Although there is documentation of the repair of fractured esthetic crowns, replacement of the crown is often the only method of managing such failures. 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. Esthetic SSCs have several shortcomings relative to traditional SSC restorations such as requiring a greater reduction of tooth structure during preparation, inability to crimp the crown, and repair of fractured coatings sometimes requiring complete replacement. Įsthetic SSCs are composite or porcelain coatings that are chemically or mechanically attached to a metal coping which allows for a tradeoff between their respective strengths and weaknesses. Despite their high success rate, this proven restoration often fails to meet the esthetic demands of patients and their parents. 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. Given the nature of primary enamel, the need for a full coverage restoration in children is all the more important. Stainless steel crowns (SSCs) are most commonly used for full coverage restoration of posterior primary teeth. 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. The control group had significantly lower shear bond strength ( ) to composite than the groups that utilized bonding agents. No significant differences were found between the shear bond strengths of Groups C and D. The shear strength of Group B was significantly greater than that of other groups. Shear bond strengths were calculated and the types of failure also were recorded. 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. Eighty (80) stainless steel crowns (SSCs) were divided into four groups (20 each). The aim of this study is to evaluate the shear bond strength of nanocomposite to stainless steel crowns using a new universal bonding system.
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