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Objective: To evaluate the infrazygomatic crest (IZC) bone and develop guidelines for the optimum placement of orthodontic miniscrew implants (OMSIs) along the distobuccal root of the permanent maxillary first molar. Methods: Bone thickness of the IZC region of 50 young adults (25 males and 25 females) aged 18-30 years were evaluated using conebeam computed tomography images. The infrazygomatic bone thickness along the distobuccal root of the permanent maxillary first molar was assessed at various insertion angles (40° to 75° i.r.t the maxillary occlusal plane) with an increment of 5°. Student's t-test was used to compare the IZC bone thickness and height at the orthodontic miniscrew insertion site for males and females on the right and left sides. Results: The bone thickness of the IZC region above the distobuccal root of the permanent maxillary first molar was estimated between 4.39±0.25 mm and 9.03±0.45 mm for insertion angles from 40° to 75° to the maxillary occlusal plane. The corresponding OMSI insertion heights were 17.71±0.61 mm to 13.69±0.75 mm, respectively, above the maxillary occlusal plane. There were statistically significant gender and side-wise variations in bone thickness at the IZC area and insertion height. Conclusion: The safe position for OMSI placement at the IZC was 13.69-16 mm from the maxillary occlusal plane with an insertion angle between 55° and 75°. These parameters provide the optimum placement of OMSIs along the distobuccal root of the permanent maxillary first molar. [ABSTRACT FROM AUTHOR]

Objective: To have an understanding of the fact how the popularity of "do it yourself" (DIY) videos available on YouTube correlate with authorship, content, quality, reliability, and how they appeal to and influence the customers. Materials and Methods: A new YouTube account was created, this was followed by a determination of the most commonly used keywords regarding DIY aligners by using "Google Trends." The keywords were used to search the YouTube website. A total of 112 videos were assessed for various parameters, such as completeness of the content, reliability using a modified version of the DISCERN tool, and quality using a Global Quality Score (GQS). Out of 112 videos, 26 were rejected based on their relevance, duplication, videos without audio, and video language. Pearson's correlation coefficient was used to study the relationship between the variables, authorship, popularity, and recommendations. Results: The majority of the videos were uploaded by the laypeople (43%), followed by DIY aligner companies (38%), and dentists and orthodontists (16%). The content for most of the videos was poor (82%), with DISCERN reliability score of zero (65%), and GQS of 1 and 2 (poor to generally poor quality). The view of uploaded videos, view rate, and likes was in proportion to the quality of the videos, their popularity, and reliability. Further authors with a financial interest and poor quality, content, and less reliability of the videos usually recommended the DIY aligners. The reduced cost was one of the important factors for the customers to consider DIY aligner treatment. Conclusion: YouTube videos on DIY aligners should not be considered a reliable source for the public in general who are looking for orthodontic treatment for correction of their dentofacial irregularities. The dental professional bodies and orthodontists should use social media platforms (YouTube) to increase awareness about the DIY aligners among the public. [ABSTRACT FROM AUTHOR]

Introduction: The study was conducted to assess the stress and displacement effects of a mini-implant supported k-loop on the maxillary dentition for distalization with 3-dimensional (3D) finite element stress analysis. Materials and Methods: A 3D model of the maxilla with all teeth, periodontal ligament, bone, mini-implants, brackets, and archwire was used in this study. The analytic model used in this study like brackets, wire, K-loop, and mini-implants was developed using a reverse engineering technique extracting the dimensional details of the physical parts using precision measuring instruments. Results: The distobuccal movement on the first molar and second molar were 0.26864 mm and 0.00833 mm, respectively. A total of 0.25 mm intrusion movement was seen on distal cusp of the first molar and 0.14 mm extrusion movement seen on mesial cusp of the first molar. A total of 0.25 mm and 0.00260 mm intrusion movement was seen on the distal cusp of the first molar and second molar, respectively. A total of 0.14 mm and 0.00324 mm extrusion movement was seen on the mesial cusp of the first molar and second molar, respectively. Conclusions: There was a large amount of distal displacement of the first molar, also negligible amount of tipping of the first molar and mesial movement of first premolar. [ABSTRACT FROM AUTHOR]