Cone beam computed tomography in assessment on pharynx effects of orthopedic-surgical treatment - a review of the literature.

The cone beam computed tomography (CBCT) image provides clear differentiation of soft tissues from empty spaces. This paper presents a literature review to evaluate the effects of orthopedic and surgical treatment on the pharyngeal dimension by CBCT. It was concluded that treatments involving dentofacial orthopedics and orthognathic surgery have been related with an increase in the upper airway volume. Standardized capturing of tomographic images and more controlled and randomized studies are necessary.

Evaluation of different types of self-ligating brackets guided by electromagnetic field simulator on rotational control

Aim: The objective of this study was to measure and compare the in vitro performance of active and passive self-ligating brackets in orthodontic rotation by means of an electromagneticfield simulation. Methods: The study sample consisted of 32 mandibular right central incisor brackets (n=8), slot 0.022", that were divided into the following groups: 1) BioQuick® (Forestadent, Pforzheim, Germany) active brackets; 2) In- Ovation®R (Dentsply-GAC, Central Islip, New York, USA) active brackets; 3) Damon-Q® (Ormco, Orange, California, USA) passive brackets, and 4) Smartclip® (3M, Monrovia, California, USA) passive brackets. The orthodontic wire used was CuNiTi round section 0.016", thermoactivated at 35o C (ORMCO- Orthodontics Glendora, California, USA). The experiment wasperformed in a simulator machine, composed of two fixedlateral axes and a movable central axis, which simulated the dental rotation. Qualitative analysis (n = 4) was performed using SEM. After the descriptive and exploratory analysis, the yield and grade data were submitted to one-way analysis of variance (ANOVA) followed by the Tukey test, considering the level ofsignificance of 5%. Results: In-Ovation®R brackets showedsignificantly higher yield than BioQuick® and Damon-Q®. Damon-Q® brackets presented a significantly lower mean valuethan In-Ovation R and Smartclip®. BioQuick® did not differsignificantly from Damon-Q® and Smartclip®. In-Ovation®R did not differ significantly from Smartclip®. Conclusion: In the present study, it was observed that there is a difference in rotational control in the different self-ligating brackets tested being the best rotational control was the In-Ovation R® group (active), followed in descending order by the groups Smartclip® (passive), Bioquick® (active) and Damon Q® (passive)