The purpose of this study was to investigate the osteopontin mRNA expression in the alveolar bone incident to the physiologic and experimental tooth movement. The upper jaws of female rats (7 weeks old) which were submitted to experimental molar tooth movement and control specimens were decalcified and sliced into paraffin sections. Osteopontin mRNA expression and tartrate-resistant acid phosph...

Background and Aim: Estrogen affects the metabolism in females. This study aimed to assess the effect of absence of estrogen on orthodontic tooth movement in rats. Materials and Methods: In this animal study, 55 rats were randomly divided into four groups. Group 1 (n=10) had intact ovaries. In group 2 (n=15), ovaries were intact but the rats were subjected to stress due to tooth preparation. I...

It is proposed that there are two types of visual movement perception, absolute and relative. The former occurs when an object is seen to move in an otherwise homogeneous (or at least locally homogeneous) visual field. Relative judgments occur when one object is seen to move with respect to another, i.e., the separation between them is seen to change. Quantitative models for both processes are ...

Background and Aim: Considering the effect of alcohol on bones, consuming alcohol may have some consequences on orthodontic tooth movement. The present study was aimed to evaluate the effect of alcohol consumption on bone density and orthodontic tooth movement in rats. Materials and Methods: In this experimental study, thirty rats were divided into three groups and underwent 3 weeks of diffe...

objective(s): to determine the effect of different doses of caffeine on orthodontic tooth movement (otm) in rats. materials and methods: forty male 250-300 g sprague-dawley rats were randomly divided into four groups of ten animals each and received 0 (control), 1 g/l, 2 g/l and 3 g/l caffeine in tap water for 3 days. orthodontic appliances were ligated between the maxillary first molars and in...

o bjectives: various methods have been introduced for evaluation of tooth movement in orthodontics. the challenge is to adopt the most accurate and most beneficial method for patients. this study was designed to introduce analysis of digital photographs with auto- cad software as a method to evaluate tooth movement and assess the reliability of this method. mat erials and methods : eighteen pat...

introduction: the aim of this study is to evaluate the effects of low-level neodymium-doped yttrium aluminium garnet (nd:yag) laser irradiation on orthodontic tooth movement and histological examination. methods: eleven male wistar rats (aged 10 weeks) were included. to produce experimental tooth movement in rats, 10 g force was applied to maxillary first molars with nickel titanium closed coil...

objective: osteopontin (opn) has been proposed to play a role in bone resorption. with regard to bone and cementum/dentin structural and histological similarities, it was hy-pothesized that expression of this gene might be increased in resorptive lacunae during orthodontic tooth movement. materials and methods: fixed nickel-titanium closed coil springs (dentaurum ® ) capa-ble of delivering appr...

Many dental practitioners do not use adhesive bridges because of concerns over high failure rates. Techniques for these restorations should be based on the fundamental principles of bridge design which require rigid, accurately fitting frameworks and careful control of the occlusion. The abutments generally require little if any tooth preparation. Greater security will result from more extensiv...