Kinetic analysis of monomer conversion in auto- and dual-polymerizing modes of commercial resin luting cements
Statement of problem Lack of knowledge regarding the kinetics of the setting reaction of dual- and autopolymerizing resin luting agents (RLA) leads the clinician to underestimate the care required during occlusal adjustments of indirect restorations. Purpose The purpose of this study was to evaluate...
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Veröffentlicht in: | The Journal of prosthetic dentistry 2009-02, Vol.101 (2), p.128-136 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Statement of problem Lack of knowledge regarding the kinetics of the setting reaction of dual- and autopolymerizing resin luting agents (RLA) leads the clinician to underestimate the care required during occlusal adjustments of indirect restorations. Purpose The purpose of this study was to evaluate the degree of conversion (DC), maximum rate of polymerization (Rpmax ), and potential of cure (ratio of conversions in autopolymerized relative to dual-polymerized modes; PCA/D ) of 5 dual-polymerizable RLAs at 5 and 10 minutes, after mixing RLA components using infrared (IR) spectroscopy. Material and methods The RLAs evaluated included Calibra, Duo-Link, Lute-It, Nexus 2, and RelyX ARC. The RLAs were manipulated and applied to the horizontal diamond element in the optical bench of an IR spectrometer. The materials were either light activated for 40 seconds (dual-polymerizing mode) or were allowed to autopolymerize (autopolymerizing mode). The DC, Rpmax , and PCA/D were calculated using standard techniques of observing changes in aliphatic-to-aromatic peak ratios before and after polymerization. Data (n=5) were analyzed by 2-way repeated measures ANOVA and Tukey's post hoc test (α=.05). Results All autopolymerizing groups exhibited lower DC and Rpmax values than the dual-polymerizing groups ( P |
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ISSN: | 0022-3913 1097-6841 |
DOI: | 10.1016/S0022-3913(09)60008-1 |