Perception of laypersons, orthodontists, and oral and maxillofacial surgeons about the transverse occlusal plane.

INTRODUCTION: Transverse occlusal plane (TOP) should be parallel to the true horizontal lines of the face (ie, the interpupillary line [IP] and commissural line [CL]). This study aimed to investigate the opinions of laypersons, orthodontists, and oral and maxillofacial surgeons about the impact of imbalanced IP and CL on facial attractiveness. METHODS: We used a symmetrical face image as the reference. Then, using Photoshop software, we constructed the following 6 photographs: TOP roll relative to CL and IP (3° and 6°) with parallelism of CL and IP, CL roll relative to TOP and IP (3° and 6°) with parallelism of TOP and IP, TOP and CL roll relative to IP (3° and 6°). Consequently, the participants rated the photographs on the basis of their attractiveness. Kruskal-Wallis and Mann-Whitney U tests were used to compare the ratings. RESULTS: One hundred thirty-one laypersons, 22 orthodontists, and 20 surgeons participated in this study. It was found that 51.1% of laypersons, 86.4% of orthodontists, and 70% of surgeons selected the reference photograph as the most beautiful, followed by the photograph with a 3° roll of CL relative to TOP, with parallelism of TOP and IP (29% of laypersons, 31.8% of orthodontists, and 35% of surgeons). CONCLUSIONS: Most participants selected the reference photograph as the most beautiful and realized a roll in the horizontal planes up to 3°. The parallelism of the esthetic line of dentition relative to interpupillary is preferred over its parallelism relative to CL.

Comparison of shear bond strength of orthodontic color change adhesive with traditional adhesive.

INTRODUCTION: The purpose of this study was to compare the shear bond strength of color-change adhesive with a conventional light-cure adhesive at different debonding times. MATERIALS AND METHODS: Seventy-two intact extracted human permanent premolar teeth were used in this research. The brackets were bonded with Transbond XT (Group I) and Transbond Plus color change adhesive (Group II). Each of the two adhesive groups were then further divided into three subgroups of 12 specimens each, for a total of six subgroups. The subgroups represented the three different time points to be tested, 15 min, 24 h, and 1 week. Then, the shear bond strength (SBS) of the brackets was tested with a Universal Testing Machine. Adhesive remnant index (ARI) scores were calculated for each debonded teeth. RESULTS: Although Transbond XT yielded the lowest SBS values at 1 week, there was no significant difference between samples regarding shear bond at different times and ARI. CONCLUSION: The application of these adhesives did not affect bond strength. Both adhesives demonstrated acceptable bond strength to withstand orthodontic forces throughout the experiment.

Mini-Screw Supported Intrusion Mechanics Used For Open Bite Closure and Facial Improvement: A Case Report.

Open-bite is one of the most challenging malocclusions to be corrected orthodontically. Temporary anchorage devices had enabled orthodontists to treat open-bite cases successfully. In this case report a 15 years old girl with open-bite was treated with maxillary molar intrusion with the aid of alveolar mini-screws.