Numeric simulation of occlusal interferences in molars restored with ultrathin occlusal veneers. 2017

Pascal Magne, and Raymond Cheung
The Don and Sybil Harrington Professor of Esthetic Dentistry, Department of Restorative Sciences, Herman Ostrow School of Dentistry of the University of Southern California, Los Angeles, Calif. Electronic address: magne@usc.edu.

BACKGROUND Selecting material for a minimally invasive occlusal veneer reconstruction concept requires an understanding of how stresses are distributed during functional and parafunctional forces. OBJECTIVE The purpose of this in vitro study was to investigate stress distribution in a maxillary molar restored with ultrathin occlusal veneers and subjected by an antagonistic mandibular molar to clenching and working and nonworking movements. METHODS A maxillary first molar was modeled from microcomputed tomography (micro-CT) data, using medical image processing software, stereolithography editing/optimizing software, and finite element software. Simulated ultrathin occlusal veneer materials were used. The mandibular molar antagonist was a solid nondeformable geometric entity. Loads simulated clenching, working, and nonworking movements with loading of 500 N. The values of the maximum principal stress were recorded. RESULTS In the clenching load situation, maximum tensile stresses were located at the occlusal veneer (52 MPa for composite resin versus 47 MPa for ceramic). In the working movement, significant additional tensile stresses were found on the palatal root (87 MPa for composite resin and 85 MPa for ceramic). In the nonworking movement, tensile stress on the ultrathin occlusal veneer increased to 118 MPa for composite resin and 143 MPa for ceramic veneers. Tensile stress peaks shifted to the mesiobuccal root (75 MPa for composite resin and 74 MPa for ceramic). CONCLUSIONS The topography of stresses generated by the various occlusal interferences were clearly identified. Significant tensile stress concentrations were found within the restoration's occlusal topography and root, with the nonworking interference being the most harmful and also the most revealing of the difference between the composite resin and ceramic ultrathin occlusal veneers.

UI MeSH Term Description Entries
D008963 Molar The most posterior teeth on either side of the jaw, totaling eight in the deciduous dentition (2 on each side, upper and lower), and usually 12 in the permanent dentition (three on each side, upper and lower). They are grinding teeth, having large crowns and broad chewing surfaces. (Jablonski, Dictionary of Dentistry, 1992, p821) Molars
D002516 Ceramics Products made by baking or firing nonmetallic minerals (clay and similar materials). In making dental restorations or parts of restorations the material is fused porcelain. (From McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed & Boucher's Clinical Dental Terminology, 4th ed) Ceramic
D003188 Composite Resins Synthetic resins, containing an inert filler, that are widely used in dentistry. Composite Resin,Resin, Composite,Resins, Composite
D003766 Dental Occlusion The relationship of all the components of the masticatory system in normal function. It has special reference to the position and contact of the maxillary and mandibular teeth for the highest efficiency during the excursive movements of the jaw that are essential for mastication. (From Jablonski, Dictionary of Dentistry, 1992, p556, p472) Canine Guidance,Occlusal Guidance,Occlusal Plane,Occlusion, Dental,Dental Occlusions,Guidance, Canine,Guidance, Occlusal,Occlusal Guidances,Occlusal Planes,Occlusions, Dental,Plane, Occlusal,Planes, Occlusal
D003793 Dental Restoration, Permanent A restoration designed to remain in service for not less than 20 to 30 years, usually made of gold casting, cohesive gold, or amalgam. (Jablonski, Dictionary of Dentistry, 1992) Dental Fillings, Permanent,Dental Filling, Permanent,Dental Permanent Filling,Dental Permanent Fillings,Dental Restorations, Permanent,Filling, Dental Permanent,Filling, Permanent Dental,Fillings, Dental Permanent,Fillings, Permanent Dental,Permanent Dental Filling,Permanent Dental Fillings,Permanent Dental Restoration,Permanent Dental Restorations,Permanent Filling, Dental,Permanent Fillings, Dental,Restoration, Permanent Dental,Restorations, Permanent Dental
D003799 Dental Stress Analysis The description and measurement of the various factors that produce physical stress upon dental restorations, prostheses, or appliances, materials associated with them, or the natural oral structures. Analyses, Dental Stress,Analysis, Dental Stress,Stress Analyses, Dental,Stress Analysis, Dental,Dental Stress Analyses
D003801 Dental Veneers The use of a layer of tooth-colored material, usually porcelain or acrylic resin, applied to the surface of natural teeth, crowns, or pontics by fusion, cementation, or mechanical retention. Dental Laminates,Dental Laminate,Dental Veneer,Laminate, Dental,Laminates, Dental,Veneer, Dental,Veneers, Dental
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D013718 Tensile Strength The maximum stress a material subjected to a stretching load can withstand without tearing. (McGraw-Hill Dictionary of Scientific and Technical Terms, 5th ed, p2001) Strength, Tensile,Strengths, Tensile,Tensile Strengths
D055114 X-Ray Microtomography X-RAY COMPUTERIZED TOMOGRAPHY with resolution in the micrometer range. MicroCT,Microcomputed Tomography,X-Ray Micro-CAT Scans,X-Ray Micro-CT,X-Ray Micro-CT Scans,X-Ray Micro-Computed Tomography,X-Ray Microcomputed Tomography,X-ray MicroCT,Xray Micro-CT,Xray MicroCT,Micro-CAT Scan, X-Ray,Micro-CAT Scans, X-Ray,Micro-CT Scan, X-Ray,Micro-CT Scans, X-Ray,Micro-CT, X-Ray,Micro-CT, Xray,Micro-CTs, X-Ray,Micro-CTs, Xray,Micro-Computed Tomography, X-Ray,MicroCT, X-ray,MicroCT, Xray,MicroCTs,MicroCTs, X-ray,MicroCTs, Xray,Microcomputed Tomography, X-Ray,Microtomography, X-Ray,Scan, X-Ray Micro-CAT,Scan, X-Ray Micro-CT,Scans, X-Ray Micro-CAT,Scans, X-Ray Micro-CT,Tomography, Microcomputed,Tomography, X-Ray Micro-Computed,Tomography, X-Ray Microcomputed,X Ray Micro CAT Scans,X Ray Micro CT,X Ray Micro CT Scans,X Ray Micro Computed Tomography,X Ray Microcomputed Tomography,X Ray Microtomography,X ray MicroCT,X-Ray Micro-CAT Scan,X-Ray Micro-CT Scan,X-Ray Micro-CTs,X-ray MicroCTs,Xray Micro CT,Xray Micro-CTs,Xray MicroCTs

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