Comparison of commercially available arch wires with normal dental arch in a group of Iranian population.

Statement Of The Problem: The stability of orthodontic treatment depends on preserving the patient's pretreatment arch form and arch size during and after treatment.

Purpose: This investigation was aimed to study the size and shape of Iranian mandibular dental arch and evaluate the correlation of their average dental arch with commercially available preformed rectangular nickel-titanium arch wires.

Materials And Method: In this study, 148 subjects were selected among students of Shiraz University of Medical Sciences.

Lack of association between Helicobacter pylori infection and oral lichen planus.

Oral lichen planus is a premalignant chronic inflammatory mucosal disorder with unknown etiology. It is a multifactorial disease and in addition to genetic background, infections, stress, drug reactions are suggested as risk factors. Helicobacter pylori which is involved in development of many gastrointestinal lesions may also be implicated in oral lichen planus induction.