Abstract
The aim of this study was to evaluate the shear bond strength of ormocer-based restorative material bonded to tooth structure using specific ormocer and nonspecific resin-based adhesives. Human molars were prepared to obtain flat buccal enamel surfaces and flat occlusal dentin surfaces. Admira bond, and Prime & Bond NT, Excite, AdheSE, and Prompt-L-Pop were applied to the prepared enamel and dentin surfaces. Ormocer restorative material was inserted into a mold fixed onto the prepared tooth surfaces. The restorative material was applied and cured. The shear bond strength was measured using a universal testing machine. The highest bond strength was recorded for Admira bond. The non-specific adhesives (AdheSE and Prompt-L-Pop) were recorded the lowest bond strength. Etch & Rinse (Prime & Bond NT and Excite) adhesives were recorded an intermediate values. Admira bond usually showed cohesive failure in the material with enamel and cohesive and mixed failure with the dentin. Etch & Rinse adhesives showed mixed failure with the enamel and, mixed and adhesive failures with the dentin. Self-etching adhesives commonly exhibited adhesive mode of failure. So, Etch & Rinse, non-specific bonding agents can be used with Admira ormocer-based restorative material when the specific adhesive is depleted.
Highlights
Today, improvements in formulations, optimization of properties, and the development of new techniques for placement have made the restoration of direct composite more reliable and predictable [1]
One-way analysis of variance (ANOVA) test showed significant difference in enamel bond strength among the tested adhesives at 95% confidence level, P < 0.001 (Table 1)
least significant difference (LSD) test showed no significant difference between Admira bond and Prime & Bond NT adhesives
Summary
Improvements in formulations, optimization of properties, and the development of new techniques for placement have made the restoration of direct composite more reliable and predictable [1]. The most recent innovation in the monomer system has been the ormocer (organically modified ceramic) technology and filler particles [3]. Ormocer is the acronym for organically modified ceramics. This class of material represents a novel inorganicorganic copolymer in the formulation that allows for modification of the mechanical parameters. Conventional adhesive systems work in three steps: etching, priming, and bonding. In an effort to simplify bonding procedures, two-steps and one-step adhesives were developed [6]. The advance in adhesive systems has made it necessary to evaluate their effectiveness in bonding restorative materials to enamel and dentin substrate. Some in vitro methods have been extensively used to do this, including the shear, tensile, and microtensile bond strength tests. Shear test have been reported as the most prevalence in the literature [7, 8]
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