Objectives To evaluate the content, reliability, and quality of videos about orthodontic clear aligners on YouTube. Materials and Methods Researchers used the Google Trends website to determine that the most frequently used search term for orthodontic clear aligners on the Internet was: “Invisalign.” A search was then conducted on YouTube using the key word “Invisalign.” From the first 140 results, 100 videos were selected for analysis. A 13-point content score was used to classify poor-content and rich-content videos, and the global quality scale (GQS) was used to examine quality of the videos. To evaluate reliability of the information, a five-question scale was used. The Mann-Whitney U-test, χ2 test, and Pearson correlation coefficients were used for statistical evaluations. Results Of the YouTube videos, 33 were classified as rich content and 67 as poor content. Most videos (73%) were uploaded by laypeople, and most uploaders (71%) were women. The most commonly discussed content was instructions (65%), followed by procedure (57%) and pain (52%). Regarding the GQS, most of the videos were evaluated as moderate quality (51%). Compared with the poor-content video group, the rich-content video group had a significantly higher GQS score (P = .004). There was no significant difference between the poor-content and rich-content groups regarding information reliability (P > .05). Conclusions Video content on YouTube relating to aligner orthodontics was generally insufficient. The quality of videos was moderate, but the reliability of information was generally poor. Specialists should refer patients to reliable sources of information.

Aim: The aim of this study was to determine the prognostic factors, such as the developmental stage of second permanent molar (SPM), the angulation of SPM, and presence/absence of the third molar associated with the spontaneous space closure after the mandibular first permanent molars (FPM) extraction. Material and Methods: A total of 177 mandibular SPMs were evaluated in this cross-sectional study. The prognostic factors determining successful space closure such as SPM developmental stage, SPM angulation, and presence/absence of the third molar were evaluated. Results: The mean age of the patients at the time of extraction of SPM was 9.4 years and post-extraction assessment at the time of the study was 12.7 years. Of the total 177 mandibular SPMs, 36 SPMs (20.3%) were at Demirjian stage D, 63 (35.6%) at stage E, 60 (34%) at stage F, 18 (10.1%) at stage G. 18 SPMs (10.1%) had distal angulation, 23 SPMs (13.0%) had mesial angulation and 136 SPMs (76.9%) had upright angulation. At the time of radiographic assessment, 79.1% of the mandibular quadrants showed evidence of third molar formation. Of the 177 mandibular SPMs, 93 (52.5%) exhibited successful space closure in the mandibular arch. Conclusions: There is no statistical significance between the chronological age and the developmental stage of the mandibular SPM with regard to the successful spontaneous space closure at the time of the dental extraction of FPMs. The presence of the mandibular third molar may be a consideration for spontaneous space closure in the mandibular arch.

Cephalometric analyzes play an important role in determining the individual's skeletal and dental structure, soft tissue and their relationship to each other. Visual cephalometric analyzes are primarily based on determining the fitness between mid-face and maxilla, then positioning the mandible relative to the midface. Thus, as in the other cephalometric analyzes, changes related to the treatment and development of the current state of the individual are determined. In the study we aimed to reveal sex-related changes of four different angles and compare them with the norm. This study was performed on right lateral cephalometric views of 80 healthy (40 women, 40 men) Turkish individuals in Anatolia aged 21-71, with Class I skeletal (ANB=2.19±1.43). In all images, angles formed by long axis of the upper incisor and palatal plan (U1/PP); the long axis of the lower incisor and mandibular plan (A1/MP); the long axes of the lower and incisor (U1/A1); the palatal plan and mandibular plan (PP/MP) were analyzed. The PP/MP value of women was found to be significantly higher than men's (p<0.01), while no significant difference was found between the U1/PP, A1/MP and U1/A1. Statistically significant negative correlations were found between correlations of all angular measurements in both genders (p<0.05). As a result, gender should also be considered as another factor beside the knowledge of angles of U1/PP, A1/MP, U1/A1 and PP/MP in orthodontic diagnosis and treatment planning. Our work continues by increasing the number of data.

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