The prognosis of the patients with ≥2 minor risk factors was significantly worse than that of the patients with 0 or 1 minor risk factor(s) (OS 91.6% vs. 64.5%, respectively, p < 0.01; CSS 98.9% vs. 78.9%, respectively, p < 0.001; and RFS 81.2% vs. 58.5%, respectively p < 0.05). Grade 4 invasion and perineural invasion might be significant minor risk factors in OSCC patients. The presence of ≥2 minor risk factors might be a predictor of a poor prognosis in OSCC patients.Grade 4 invasion and perineural invasion might be significant minor risk factors in OSCC patients. The presence of ≥2 minor risk factors might be a predictor of a poor prognosis in OSCC patients. In Taiwan, there are three major dentist occupation problems a surplus of dentists, an uneven regional distribution of dentists, and a concentration of dentists in the metropolitan areas. The purpose of this study was to evaluate the distributions of the population and dentists in each city or county in 2001, 2010 and 2019 to further analyze the changes of regional distributions of dentists 9 years after the implementation of postgraduate year training program for dentists (PGYD) in 2010 in Taiwan. This study collected the data of population, the number of dentists in each city or county in 2001, 2010 and 2019, and the numbers of dentists and dental institutions from 2001 to 2019 for evaluating the changes of regional distributions of dentists 9 years after the PGYD implementation in Taiwan. Nine years after the PGYD implementation, the uneven distribution of dentists persisted. The number of dentists still increased and dentists were more concentrated in municipalities than in non-municipalities in Tai dental institutions in municipalities in Taiwan. Relationship between facial attractiveness and facial components is not completely clear. The aim was to analyze the correlation between facial attractiveness and facial components assessed by laypersons and orthodontists. The attractiveness of 100 adult patients (50 males and 50 females with their frontal, lateral, and frontal smiling photos), before orthodontic treatment, was assessed by 24 laypersons and 24 orthodontists using visual analog scale. Pearson correlation coefficient and stepwise regression were used for statistical analysis. When laypersons assessed, a significant correlation was found between facial attractiveness and the chin (r = 0.671), eyes (r = 0.669), lips (r = 0.585), hair (r = 0.527), teeth (r = 0.338), and nose (r = 0.247); the chin was responsible for 45.1% of the variation in facial attractiveness, the eyes for 14.3%, and the lips for 0.8%. When orthodontists assessed, a significant correlation was found between facial attractiveness and the lips (r = 0.789), eyes (r = 0.646), hair (r = 0.613), chin (r = 0.565), nose (r = 0.264), and teeth (r = 0.221); the lips were responsible for 62.2% of the variation in facial attractiveness, the eyes for 8.2%, the chin for 1.4%, and the hair for 0.5%. When laypersons evaluate, the chin contributes the most to facial attractiveness, and when orthodontists evaluate, the lips contribute the most. Whether in the evaluation of laypersons or orthodontists, the contribution of teeth to facial attractiveness is significantly less than that of the lips and chin.When laypersons evaluate, the chin contributes the most to facial attractiveness, and when orthodontists evaluate, the lips contribute the most. Whether in the evaluation of laypersons or orthodontists, the contribution of teeth to facial attractiveness is significantly less than that of the lips and chin. To assess the usefulness of plastic bracket primer (PBP) for improving the bond strength of plastic brackets (PBs) using three types of orthodontic brackets, including PBs, metal brackets (MBs), and ceramic brackets (CBs). A total of 162 premolars were gathered and divided equally into six groups of 27. Three groups were tested with the application of PBP (PB+, MB+, and CB+), and three groups were tested without primer (groups PB-, MB-, and CB-). All the groups were bonded using BeautiOrtho Bond II self-etching adhesive. The shear bond strength (SBS) was measured and the bond failure mode was evaluated using the adhesive remnant index after debonding. There were significant differences in the mean SBS between groups PB-, MB and CB-, between PB+ and CB+, and between MB+ and CB+. Group PB+had a significantly higher mean SBS than group PB-. The occurrence of bond failure at the enamel and adhesive interface was more frequent in groups PB+ and CB- than in group PB-; and in groups PB+ and CB+than in group MB+. Plastic bracket primer can increase the bond strength of PBs to the level of metal brackets, but not to the level of ceramic brackets.Plastic bracket primer can increase the bond strength of PBs to the level of metal brackets, but not to the level of ceramic brackets. Genioplasty were used widely to correct chin deformities. The purpose of this study was to design and manufacture a dental-supported surgical guide for genioplasty surgery and assess for surgical accuracy. eleven patients with chin deformities were treated in this study. The computed tomography (CT) data of the patient's skull and the digital dental models of stone dental models were acquired preoperatively. For each patient, a virtual three-dimensional (3D) model of the skull was constructed and enhanced with digital dental models. A surgical simulation was then performed using computer-aided surgical simulation (CASS) technology based on clinical examination and 3D cephalometry. click here The surgery was simulated preoperatively which allowed the design of a cutting guide and a dental-supported repositioning guide for genioplasty, which was then 3D-printed and used during operation after disinfection. After surgery, the outcome was evaluated by superimposing the postoperative CT model onto the preoperative model, recording the linear and angular deviation of landmarks and plane, then measuring the differences between the planned and actual outcomes. The osteotomy and repositioning were successfully performed as planned using surgical guides. No inferior alveolar nerve damage was seen in this study. The dental-supported surgical guide showed excellent accuracy, with the largest differences between the planned and the postoperative chin segment being 0.9 mm and 3.2°. The dental-supported surgical guide designed preoperatively provided a reliable method of transfer genioplasty planning. This can assist surgeons in accurately performing osteotomy and repositioning bone segments during a genioplasty.The dental-supported surgical guide designed preoperatively provided a reliable method of transfer genioplasty planning. This can assist surgeons in accurately performing osteotomy and repositioning bone segments during a genioplasty.