The aim of this retrospective research is to compare frontal sinus dimensions in skeletal Class I, skeletal Class II, and skeletal Class III individuals and to evaluate the relationship of these dimensions with anterior skull base length and some cephalometric values. Materials and MethodsIn this research, we used lateral cephalometric radiographs of 60 people aged 17 to 25. In individuals with skeletal Class I malocclusion, skeletal Class II malocclusion due to mandibular insufficiency, and skeletal Class III malocclusion due to mandibular excess, measurements of frontal sinus length and height as well as S-N, Co-A and Co-Gn lengths, ANB 0 , FMA 0 , SN-GoGn 0 angles values were performed. The length between the highest point and the lowest point of the frontal sinus was calculated as the height of the frontal sinus, and the length between the most anterior and the most posterior points of the frontal sinus was calculated as the length of the frontal sinus. ResultsThe frontal sinus length and height were found to be higher in skeletal Class III individuals than in skeletal Class I and skeletal Class II individuals, however, there was no significant difference between skeletal Class I and Class II individuals. ConclusionThe increase in frontal sinus height and length correlated positively with the decrease in the ANB angle and the increase in the SN and Co-Gn lengths. The dimensions of the frontal sinus may be an indicator for the remaining mandibular growth potential.
Objective The study aimed to assess skeletal changes in the vertical plane in hyperdivergent individuals who underwent fixed orthodontic treatment that included the extraction of four premolars. Materials and Methods The study was carried out on the cephalometric radiographs of 52 individuals. The patients were classified into Group A, who underwent fixed orthodontic therapy without extraction, and Group B, who underwent fixed orthodontic extraction. Patients characterized by the following were included: skeletal class I, hyperdivergent individuals, ≤ 6 mm crowding for Group A, 6 mm for Group B individuals with crowding > 6 mm, and individuals in whom tooth extraction space is closed with a moderate or minimum anchorage. The FMA, Post. SUM, Sn/GoGn angles, and N–Me distance in radiographs were evaluated at the beginning (T1) and end of treatment (T2). Results The SN/GoGn, Post. SUM, and N-Me values were higher during T2 than during T1 in both groups (p = 0.05; p < 0.01). A comparison of the T2–T1 difference according to the groups and the measurement values, whereas no statistically significant difference was observed in the Sn/GoGn, FMA, or N–Me changes. The 0.430 increase in the Post. SUM value showed a statistically significant difference. Conclusion In hyperdivergent patients receiving orthodontic treatment involving the extraction of four premolars, minimum- and moderate-anchorage alternatives have no influence on the vertical direction. Clinical Relevance: The impacts of various anchoring techniques on individuals vertical characteristics should be considered when planning a fixed orthodontic treatment.
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