Abstract
The purpose of this study was to determine the effect of cavity depth, ceramic thickness, and resin bases with different elastic modulus on von Mises stress patterns of ceramic inlays. Tridimensional geometric models were developed with SolidWorks image software. The differences between the models were: depth of pulpal wall, ceramic thickness, and presence of composite bases with different thickness and elastic modulus. The geometric models were constrained at the proximal surfaces and base of maxillary bone. A load of 100 N was applied. The stress distribution pattern was analyzed with von Mises stress diagrams. The maximum von Mises stress values ranged from 176 MPa to 263 MPa and varied among the 3D-models. The highest von Mises stress value was found on models with 1-mm-thick composite resin base and 1-mm-thick ceramic inlay. Intermediate values (249-250 MPa) occurred on models with 2-mm-thick composite resin base and 1-mm-thick ceramic inlay and 1-mm-thick composite resin base and 2-mm-thick ceramic inlay. The lowest values were observed on models restored exclusively with ceramic inlay (176 MPa to 182 MPa). It was found that thicker inlays distribute stress more favorably and bases with low elastic modulus increase stress concentrations on the internal surface of the ceramic inlay. The increase of ceramic thickness tends to present more favorable stress distribution, especially when bonded directly onto the cavity without the use of supporting materials. When the use of a composite base is required, composite resin with high elastic modulus and reduced thickness should be preferred.
Highlights
Biomechanical behavior similar to natural teeth is expected when porcelain and composite resins are used together to replace lost enamel and dentin [1]
Despite the widespread use of composite bases, there are few studies that assess their influence on strength of the tooth/restoration complex and how this procedure can affect the behavior of ceramic restorations [3]
The von Mises stress patterns varied among the models and a distinct stress distribution was observed
Summary
Biomechanical behavior similar to natural teeth is expected when porcelain and composite resins are used together to replace lost enamel and dentin [1]. One way to combine these materials is by applying the composite basing technique, in which composite resins replace lost dentin and serve as a supporting structure for the ceramic that replaces the missing enamel. Despite the widespread use of composite bases, there are few studies that assess their influence on strength of the tooth/restoration complex and how this procedure can affect the behavior of ceramic restorations [3]. The brittle nature of ceramics requires an appropriate supporting structure to reinforce and increase the strength of tooth-restoration complex [6]
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