Extensive restorations of single anterior teeth are accomplished by using porcelain jacket crowns or porcelain enamel or plastic veneer restorations supported by an alloy restoration that is luted to the tooth. The porcelain jacket crown has the advantage that less tooth tissue must be removed, but the material is brittle and lacks impact strength. Studies by McLean",2 have shown that these res...

A calcium phosphate cement (CPC) sets to form hydroxyapatite and has been used in dental and craniofacial applications. However, when CPC was used in periodontal repair, tooth mobility resulted in the fracture and exfoliation of the brittle implants. The aim of this study was to develop CPC-chitosan lactate composites with higher strength and increased strain before failure. It was hypothesized...

Abstract The article presents a comprehensive study on the tooth bending strength of spur gears with progressive curved path contact, or so-called S-gears. Systematic gear meshing simulations were conducted to effects S-gear geometry parameters strength. Different geometries analysed in systematically organized manner, and comparison was made against standard 20° pressure angle involute shape. ...

INTRODUCTION The main objective of adhesive dentistry is to create an effective, durable union between the tooth structure and restorative material. However, degradation of adhesive dentine interface remains largely responsible for the relatively short lifetime of tooth colored resin restoration. AIM The aim of the study is to compare the dentin collagen stabilization property of Chlorhexidin...

The development of dentin bonding agents has made the adhesion between composite restorative resins and dentin possible. Laboratory studies involving microleakage and bond strength tests are carried out to predict the longevity of composite resin restorations in the clinical situation. Microleakage at the restoration/tooth interface may result in breakdown at the margins of restorations, the de...

Background: The reattached fragments are prone to re-fracture if another traumatic episode occurs or under non-physiological use of the restored teeth. There is a scarcity literature regarding management uncomplicated crown fracture reattachment following further Therefore, concerns have been directed towards strength fractured Hence aim in-vitro study was evaluate & compare impact with com...

Natural materials such as bone, tooth, and nacre are nanocomposites of proteins and minerals with superior strength. Why is the nanometer scale so important to such materials? Can we learn from this to produce superior nanomaterials in the laboratory? These questions motivate the present study where we show that the nanocomposites in nature exhibit a generic mechanical structure in which the na...

Tensile bond strength and failure location were evaluated in vitro for three types of direct bonding cements (unfilled, low filled, and highly filled) with three types of brackets (polycarbonate, stainless steel, and ceramic) using natural teeth and plastic as substrates. An unfilled acrylic cement gave the highest values of bond strength for both the plastic and ceramic brackets, whereas a hig...