INTRODUCTION AND OBJECTIVE A hectic lifestyle and everyday stress are direct causes of parafunctions. The objective of the presented study was to examine the relation of sleep disorders, distant pain symptoms, symptoms of pathological tooth wear in rural and urban patients with parafunctions. MATERIALS AND METHODS The patient group consisted of 836 women and 274 men aged 9-82, and divided int...

This study investigated features of the functional occlusion in a group of 37 patients immediately following two-arch fixed appliance treatment. Study casts were mounted in the retruded axis position on a semi-adjustable articulator and occlusal contacts were recorded with articulating paper in retruded and lateral mandibular positions. The magnitude of the slide between the retruded axis posit...

Theoretical and experimental investigation of wear during coupling in internal gears coated with various polymeric coating materials was performed in this study. In the theoretical part of the study, Archards’ wear formulation was adapted to internal gears and wear behavior in various conditions was determined. Moreover, a fatigue and wear testing apparatus having similar working principle with...

Worn, flat occlusal surfaces and anterior edge-to-edge occlusion are ubiquitous among the dentitions of prehistoric humans. The concept of attritional occlusion was proposed in the 1950s as a hypothesis to explain these characteristics. The main aspects of this hypothesis are: 1) the dentitions of ancient populations in heavy-wear environments were continuously and dynamically changing owing to...

BACKGROUND This in vitro study analysed the effect of different fluoride concentrations in acidic or neutral liquid dentifrices in protecting enamel and dentine from erosive and abrasive wear. METHODS Bovine enamel and dentine specimens (n = 132) were randomly allocated to 11 groups (each n = 12): experimental liquid dentifrices with 550 ppm F, 1100 ppm F, 5000 ppm F or 0 ppm F/placebo (each ...

Laboratory evaluation of spring constants (k) of wrought wire clasps (WWC) separated from removable partial denture (RPD) and the results of tibological tests which represent the dependence of enamel wear with normal force have been presented in the paper. The results of laboratory examinations have been combined with the results of clinical assessment of the level of abutment teeth wear. On th...

UNLABELLED Tooth wear is a complex multifactorial process that involves the loss of hard dental tissue. Parafunctional habits have been mentioned as a self-destructive process caused by stress, which results in hyperactivity of masticatory muscles. Stress manifests itself through teeth grinding, leading to progressive teeth wear. The effects of continuous exposure to industrial noise, a "stress...

A fast swept-source optical coherence tomography (SS-OCT) system is employed to acquire volumes of dental tissue, in order to monitor the temporal evolution of dental wear. An imaging method is developed to evaluate the volume of tissue lost in ex vivo artificially induced abfractions and attritions. The minimal volume (measured in air) that our system could measure is 2352 μm3. A volume of 25,...

The wear performances of bovine tooth enamel (BTE) against translucent tetragonal zirconia polycrystals (TZP) compared to that of feldspar porcelain and the influence of surface treatments of translucent TZP were investigated by the two-body wear test. Translucent TZP and feldspar porcelain were used as hemisphere abrader specimens with a radius of curvature of 5 mm; flat BTE surfaces were used...

Introduction:Temporomandibular disorders (TMDs) are referred to signs and symptoms involving masti‌catory muscles, temporomandibular joint and rele‌vant structures. Having been prevalent noticeably, we decided to evaluate the frequency of TMD, among patients referred to the dental clinic of Guilan university of medical sciences. Materials and Methods: In this cross-sectional study, a sample of ...