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Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Polymerization shrinkage of dental resin composites can lead to restoration debonding or cracked tooth tissues in composite-restored teeth. In order to ...

University of Minnesota

Among the current mathematical models for bone remodeling, few can consider bone resorption due to overload. The objective of this paper is to develop a new bone remodeling model which can simulate both underload and overload resorptions that often occur in dental implant treatments.

A mathematical model for simulating the bone remodeling process under mechanical stimulus.

The purpose of this study was to derive alternative implant shapes which could minimize the stress concentration at the shoulder level of the implant.

Shape optimization of dental implants.

Clinical data indicate that previously restored teeth are more likely to fracture under occlusal loads. The reason for this is attributed to the high stresses at the tooth-restoration interface, especially following debonding of the restoration from the tooth. This work aims to minimise these interfacial stresses by optimizing the cavity shape using modern shape optimisation techniques.

A two-stage shape optimization process for cavity preparation.

The aim of this study was to measure the full-field polymerization shrinkage of dental composites using optical image correlation method.

Measurement of the full-field polymerization shrinkage and depth of cure of dental composites using digital image correlation.

Failures of fixed partial dentures (FPDs) made of fibre-reinforced composites (FRC) have been reported in many clinical and in vitro studies. The types of failure include debonding at the composite-tooth interface, delamination of the veneering material from the FRC substructure and fracture of the pontic. The design of the FRC substructure, i.e. the position and orientation of the fibres, will affect the fracture resistance of the FPD.

Structural optimization of the fibre-reinforced composite substructure in a three-unit dental bridge.

The aim of this study was to explore the correlations between the Knoop hardness, Young's modulus, viscosity, and polymerization shrinkage of an experimental dental composite, in order to determine the temporal variations of the material properties during the polymerization process.

Multiple correlations of material parameters of light-cured dental composites.

This study compared splinted and non-splinted implant-supported prosthesis with and without a distal proximal contact using a digital image correlation method. An epoxy resin model was made with acrylic resin replicas of a mandibular first premolar and second molar and with threaded implants replacing the second premolar and first molar. Splinted and non-splinted metal-ceramic screw-retained crowns were fabricated and loaded with and without the presence of the second molar. A single-camera measuring system was used to record the in-plane deformation on the model surface at a frequency of 1.0Hz under a load from 0 to 250N. The images were then analyzed with specialist software to determine the direct (horizontal) and shear strains along the model. Not splinting the crowns resulted in higher stress transfer to the supporting implants when the second molar replica was absent. The presence of a second molar and an effective interproximal contact contributed to lower stress transfer to the supporting structures even for non-splinted restorations. Shear strains were higher in the region between the molars when the second molar was absent, regardless of splinting. The opposite was found for the region between the implants, which had higher shear strain values when the second molar was present. When an effective distal contact is absent, non-splinted implant-supported restorations introduce higher direct strains to the supporting structures under loading. Shear strains appear to be dependent also on the region within the model, with different regions showing different trends in strain changes in the absence of an effective distal contact.

Digital image correlation analysis of the load transfer by implant-supported restorations.

The purpose of this study was to evaluate the cantilever-bending test as a bond-strength measurement method for enamel/composite adhesion.

A comparison of bond strengths measured using cantilever bending and micro-tensile methods.

The aim of this study was to numerically evaluate the effects of filler contents and resin properties on the material properties of dental composites utilizing realistic 3D micromechanical finite element models.

Numerical evaluation of bulk material properties of dental composites using two-phase finite element models.

A novel technique using a composite disk under diametral compression was presented in a previous study for measuring the bond strength between intracanal posts and dentin. This study deals with the stress distribution within the composite disk to allow the bond strength to be calculated accurately. The effects of changing geometrical and material parameters on the post-dentin interfacial stress are also evaluated.

Diametral compression test with composite disk for dentin bond strength measurement--finite element analysis.

A validated numerical model for stress/strain predictions is essential in understanding the biomechanical behavior of implant-supported dental prostheses. The digital image correlation (DIC) method for full-field strain measurement was compared with finite element analysis (FEA) in assessing bone strain induced by implants.

Validation of finite element models for strain analysis of implant-supported prostheses using digital image correlation.

The aim of this paper is to develop a comprehensive mathematical model for shrinkage stress development in dental composites that can account for the combined effect of material properties, specimen geometry and external constraints.

Shrinkage stress development in dental composites--an analytical treatment.

Whether splinting or not splinting adjacent implants together can optimize the stress/strain transfer to the supporting structures remains controversial.

Alex S. L. Fok

Minnesota Dental Research Center for Biomaterials and Biomechanics,
School of Dentistry,
Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry

University of Minnesota

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Alex S. L. Fok

Minnesota Dental Research Center for Biomaterials and Biomechanics,School of Dentistry,Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry

University of Minnesota

Shrinkage of Dental Composite in Simulated Cavity Measured with Digital Image Correlation

Minnesota Dental Research Center for Biomaterials and Biomechanics,
School of Dentistry,
Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry