Abstract
BackgroundThe purpose of this study was to evaluate the effect of glycine pretreatment on the shear bond strength between dentin and a CAD/CAM resin nano ceramic material (LavaTM Ultimate Restorative), bonded together with adhesive cements using three different luting protocols (total-etch; self-etch; self-adhesive).Material and MethodsThirty cylinders were milled from resin nano ceramic blocks with CAD/CAM technology. The cylinders were subsequently cemented to the exposed dentin of 30 bovine permanent mandibular incisors. The specimens were assigned into six groups of five teeth each according to luting procedure and dentin pretreatment. In the first two groups (A1, A2) 10 cylinders were cemented using a total-etch protocol; in groups B1 and B2, 10 cylinders were cemented using a self-etch protocol; in groups C1 and C2, 10 cylinders were cemented using a self-adhesive protocol; in groups A1, B1 and C1 the dentinal surface was also treated with glycine powder. All cemented specimens were submitted to a shear bond strength test. Statistical analysis was performed with Stata 9.0 software.ResultsANOVA showed the presence of significant differences among the various groups (P <0.0001).ConclusionsGlycine did not change the different bond strength demonstrated by the various luting protocols tested. Conventional resin composite cements used together with a self-etch adhesive reported the highest values. However the use of glycine seems to increase the bond strength of self-adhesive resin cements. Key words:Adhesive cements, CAD/CAM, glycine, luting system, resin nano ceramic, shear bond strength.
Highlights
Patients’ needs and desires and developments in adhesive dentistry have made the use of all-ceramic restorations increasingly frequent, silica-based ones such as crowns, inlay-onlays and laminate veneers [1]. to improve the impression and casting procedure steps and to produce indirect restorations faster and easier, without the need for provisional restorations and dental laboratories, computer aided design/computer-aided manufacturing (CAD/computer aided manufacturing (CAM)) systems are commonly e146used [2]
The purpose of this study was to evaluate the effect of glycine pretreatment on the shear bond strength between dentin and a computer aided design/computer-aided manufacturing (CAD/CAM) resin nano ceramic material (LavaTM Ultimate Restorative), bonded together with adhesive cements using three different luting protocols
Material and Methods The specifications of materials tested are listed in table 1. -Specimens’ preparation In the present in vitro study, 30 cylinders (5 mm in diameter, 3 mm thick) were designed with CEREC Software 4.2 platform (Sirona Dental GmbH, Salzburg, Austria) and obtained by milling from resin nano ceramic blocks for computer-aided design (CAD)/CAM
Summary
Patients’ needs and desires and developments in adhesive dentistry have made the use of all-ceramic restorations increasingly frequent, silica-based ones such as crowns, inlay-onlays and laminate veneers [1]. to improve the impression and casting procedure steps and to produce indirect restorations faster and easier, without the need for provisional restorations and dental laboratories, computer aided design/computer-aided manufacturing (CAD/CAM) systems are commonly e146used [2]. In order to ensure bond strength, air-polishing devices have been previously reported to increase roughness of both dental hard tissues and restorative materials [9] Amongst these polishing systems, sodium bicarbonate may be disadvantageous as a pretreatment prior to dentin bonding [10]. The purpose of this study was to evaluate the effect of glycine pretreatment on the shear bond strength between dentin and a CAD/CAM resin nano ceramic material (LavaTM Ultimate Restorative), bonded together with adhesive cements using three different luting protocols (total-etch; self-etch; self-adhesive). The use of glycine seems to increase the bond strength of self-adhesive resin cements
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