Numerical Study of the Mechanical Behaviour of Wedge-Shaped Defect Filling Materials

Abstract

This paper deals with direct restorations of teeth with non-carious cervical lesions (NCCL). NCCL defects are capable of gradual growth and are accompanied by the degradation of the surrounding tissue. Direct restorative treatment, in which the cavity is filled with a cementing agent, is considered to be an accessible and common treatment option. The study included simulations of the teeth without lesions, the teeth with V and U lesions and the tooth-restorative system. Parameterised numerical tooth models were constructed. Two cases with defect depths of 0.8 mm and ~1.7 mm and three variants with fillet radii of the defect end of 0.1, 0.2 and 0.3 mm were considered. The effect of two biomaterials for restorations was studied, namely Herculite XRV (Kerr Corp, Orange, CA, USA) and Charisma (Heraeus Kulzer GmbH, Hanau, Germany). The models were deformed with a vertical load of 100 to 1000 N from the antagonist tooth. The tooth-restorative system was considered, taking into consideration the contact interaction in the interface areas with the tooth tissues. Within the limits of the research, the character of the distribution of the deformation characteristics and their dependence on the level of loading, the depth of the defect and the radius of the curvature of the “wedge” were established.

Morphological and Optical Coherence Tomography Aspects of Non-Carious Cervical Lesions

“…To determine the shape of the NCCL, the walls of the lesion were identified: the coronal wall, from the occlusal surface of the tooth and the gingival wall, from the vicinity of the cervical region [ 30 ]. Depending on the angle formed by the two walls, the lesions were classified into two patterns: wedge shaped with a sharp angle and saucer shaped with a rounded angle [ 3 , 22 , 34 ].…”

“…NCCLs particularly influence the patient’s oral status, by affecting the dental aesthetics, producing dentine hypersensitivity, and because of the evolution of these lesions, the risk of teeth fracture increases [ 22 , 23 , 24 ].…”

Elasto-Static Analysis of Composite Restorations in a Molar Tooth: A Meshless Approach

“…The forceful grinding or clenching of teeth in bruxism creates excessive pressure on the teeth and their supporting structures, which may contribute to the formation of wedge-shaped defects in combination with other factors. In this regard, Sakhabutdinova et al [ 13 ] performed a numerical analysis to assess the stress state on a tooth model in the presence of two wedge-shaped defects and different restorative materials. Furthermore, Brailko et al [ 14 ] numerically studied the influence of size and location of wedge-shaped defects of teeth on stress and strain state of restorative material on the basis of biomechanical analysis.…”