Abstract
Objectives. To evaluate microleakage and absolute marginal discrepancy (AMD) and to assess correlation between AMD and microleakage with four resin luting cements. Material and Methods. 20 extracted human third molars were prepared for full-coverage crowns. 20 zirconia copings were made (LAVA, 3M ESPE) and cemented. Specimens were randomly allocated for each used type of cement into 4 groups, RelyX® (Rx), Multilink® (Mk), PANAVIA 2.1® (P), and Maxcem® (Mx) and immersed in 10% safranin for 72 hours. 20x magnification lenses were used to observe microleakage areas (μm2) and images software was used to measure AMD areas (μm). Discrepancy and microleakage between the cements were compared with one-way ANOVA test with confidence interval of 95%. Results. Rx Group showed microleakage has lowest value and AMD has highest value. P Group showed microleakage has the highest value and Mk Group presented AMD has lowest value. There were no significative differences between the cements. There were no linear correlations between microleakage and AMD; however a complex regression statistical model obtained allowed formulating an association between both variables (microleakage = AMD0,896). Conclusions. No significative differences were found among 4 types of cements. No linear correlations between AMD and microleakage were found. Clinical Significance. AMD is not easily related to microleakage. Characteristics of cements are fundamental to decreasing of microleakage values.
Highlights
For the long-term success of restorations with all ceramic crowns, the clinician should consider several factors
The applied force to adapt a crown is other important concern about the marginal fit; less than 10 N is insufficient and 100 N is excessive and may cause pulpal damage; Goracci et al [8] established that the interfacial strength and adaptation of self-adhesive cement are enhanced when a greater force than the digital pressure (20 N) is maintained during the initial self-curing period
This study aims to evaluate microfiltration and absolute marginal discrepancy (AMD) and to associate level AMD with microfiltration between 4 types of resin luting cements
Summary
For the long-term success of restorations with all ceramic crowns, the clinician should consider several factors. Marginal fit of prosthetic crowns is an essential requirement to achieve the goal [1]. Marginal fit discrepancy can cause plaque accumulation, secondary caries, and periodontal inflammation [2]. The ADA’s (American Dental Association) number 8 specification [5] suggests a maximum cement thickness of 40 μm, but this range is seldom achieved [1]. The applied force to adapt a crown is other important concern about the marginal fit; less than 10 N is insufficient and 100 N is excessive and may cause pulpal damage; Goracci et al [8] established that the interfacial strength and adaptation of self-adhesive cement are enhanced when a greater force than the digital pressure (20 N) is maintained during the initial self-curing period. Holmes et al [9] suggested the terminology to use in order to clarify misfit and explain that standardization is probably not possible
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