Application of the OPG in the Prediction of Unfavorably Angulated Canines: An Original Study.

Introduction: Achieving a correct occlusion depends heavily on the axial inclination of the teeth, particularly the maxillary anteriors, which have the longest crowns. This study, which expanded the use of angular measures to the mandible, was created to determine the prevalence of adversely angulated canines using orthopantomograms. Methods: A sample of 200 people between the ages of 18 and 25 was chosen and separated into two groups based on the degree of crowding; one group served as the control group while the other, which experienced severe, crowding, served as the study group. All of the individuals had their Orthopantomogram and study models taken. Results: While canine angulation in controls typically ranges from 85 to 95 degrees, cases of crowding were observed to have angulation as low as 67 degrees and as high as 105 degrees. Conclusion: Orthopantomogram can be used to predict canine angulation, with distally and mesially angulated canines occurring at rates of roughly 18% and 37%, respectively.

Investigation of the change in the degree of Frankfort mandibular plane angle after levelling the curve of spee in different malocclusion groups.

BACKGROUND AND OBJECTIVES: The curve of Spee is a naturally occurring phenomenon in the human dentition. Leveling the curve of Spee can affect the Frankfort-mandibular plane (FMP) Angle and thus the lower anterior facial height. This study examined the degree of change in FMP angle after leveling the curve of Spee in different malocclusion groups. METHODS: In this study, 75 patients who were aged >14 years and had undergone fixed appliance therapy using a 0.022-slot MBT bracket system were included. The pre- and post-treatment casts and lateral cephalograms of the patients were divided into three groups, namely Class I, II, and III malocclusions, with 25 patients in each group. The curve of Spee and FMP angle were measured before and after orthodontic treatment, and their correlation was evaluated. RESULTS: After leveling the curve of Spee, the FMP angle decreased in Class I and II groups and increased in Class III group. These results were statistically significant except in Class I malocclusion group. A mild positive correlation was observed between the curve of Spee and FMP angle in Class I and III malocclusion groups and a negative correlation in Class II malocclusion group. CONCLUSION: The change in FMP angle, following the leveling of the curve of Spee, in Class II and III malocclusion group, is attributed to alterations in lower anterior facial height. The study observed a mild positive correlation between the curve of Spee and FMP angle in Class I and III malocclusion groups and a negative correlation in Class II malocclusion group.