Microleakage of Different Self-Adhesive Materials for Lithium Disilicate CAD/CAM Crowns

Ella Naumova,Katharina Schaper,Andree Piwowarczyk,Alexander Valta,Wolfgang Arnold

doi:10.3390/ma8063238

Abstract

Objectives: To evaluate the microleakage and marginal gap of various luting materials after cementing ceramic crowns. Methods: Cervical margins of human molars were designed as circular chamfers. Cementation of full-contour ceramic crowns was conducted with zinc-phosphate cement (Harvard cement), resin cement (Panavia F 2.0) and self-adhesive resin cements (RelyX Unicem, BifixSE, MaxCem Elite, PermaCem2.0, G-Cem). Aging of specimens was performed in artificial saliva, at 37 °C for four weeks and thermocycling. The marginal gap was measured with a scanning electron microscope and silver precipitation within the microleakage. All data were compared statistically. Results: Independent of the margin preparation, the highest median value for microleakage was 320.2 μm (Harvard cement), and the lowest was 0 μm (Panavia F 2.0). The median value for enamel was 0 µm and for dentin 270.9 μm (p < 0.001), which was independent of the luting material. The marginal and absolute marginal gaps were not significantly different between the tested materials. There was no correlation between microleakage and the marginal gaps. Conclusion: Significant differences in microleakage were found between the tested luting materials (p < 0.05). Independent from the luting materials, the microleakage in dentin showed significantly higher values than in enamel.

Highlights

IntroductionMarginal gap, the oral environment, including force, thermal loading, and contact with the oral medium (saliva) influence the duration of indirect restoration (crown stability) and sealing ability in vivo
Variables such as microleakage, marginal gap, the oral environment, including force, thermal loading, and contact with the oral medium influence the duration of indirect restoration and sealing ability in vivo
Regardless of the location of the preparation line, the lowest values for microleakage were found for Panavia F2.0

Summary

Introduction

Marginal gap, the oral environment, including force, thermal loading, and contact with the oral medium (saliva) influence the duration of indirect restoration (crown stability) and sealing ability in vivo. Microleakage characterizes the marginal sealing [1,2], and the marginal gap characterizes the marginal adaptation [3]. The marginal gap depends on the surface characteristics and type of luting agent [6]. Knowledge about the luting quality and characteristics of the different classes of materials for connecting the tested surface dentin or enamel with the full crown helps to achieve the long-term effect by cementation and to develop new classes of luting materials for improving clinical success [3,4,5]

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Discussion

Conclusion