The purpose of the study was to evaluate interleukin-6 production, in saliva-activated mononuclear cell cultures from malocclusion patients, before and after placement of .014 NiTi archwires.Four patients receiving .014 Nitinol archwire to correct malocclusion participated in this study. Samples of their blood and saliva were collected before and after placement of the apparatus. Mononuclear ce...

Extraction therapies are commonly done in patients with protrusion and/or crowding which demands a thorough understanding of biomechanics. Two basic types space closing mechanics friction/sliding and frictionless/loop mechanics. In the former, wire position bracket important factors tooth movement but simplicity friction is offset by binding between archwire may be associated undesirable side e...

The objective of this study was to evaluate the time-dependent viscoelastic properties of an aesthetic orthodontic archwire. The wire is based on a recently developed translucent polyphenylene thermoplastic, whose rigid molecular structure provides high strength. While the wire has good instantaneous mechanical properties, over time all polymers may relax so it is important to understand the po...

BACKGROUND An important constituent of an orthodontic appliance is orthodontic brackets. It is either the bracket or the archwire that slides through the bracket slot, during sliding mechanics. Overcoming the friction between the two surfaces demands an important consideration in an appliance design. The present study investigated the surface roughness of four different commercially available s...

INTRODUCTION The aim of this in-vitro study was to evaluate the frictional forces generated by various combinations of brackets and orthodontic wires by using an experimental model with 3 nonleveled brackets to gain a better understanding of the resistance to sliding during dental alignment and leveling. METHODS Two kinds of orthodontic brackets were tested: passive self-ligating brackets and...

A detailed microstructural analysis during the intermediate stages of fabrication NiTi orthodontic archwire is carried out in this study. These findings were related to phase transformation characteristics such as start and finish temperature, thermal hysteresis, etc. The objective was monitor window different thermomechanical processing. casted alloy further subjected combinations hot cold for...

The aim of this study was to compare frictional resistance among conventional, passive and active selfligating brackets using Finite Elements Analysis (FEA). Seventynine (79) slide tests were performed by combining an upper first bicuspid conventional bracket, 0.018" stainless steel wires and 0.010" ligature by means of an INSTRON 3345 load system to obtain average maximum static frictional res...

BACKGROUND During orthodontic tooth movement friction occurs at the bracket wire interface. Out of the total force applied to the tooth movement, some of it is dissipated as friction, and the remainder is transferred to the supporting structures of the tooth to mediate tooth movement. However many factors affect friction, and method of arch wire ligation being an important contributing factor. ...