Soghra Yassaei; Hossein Aghili; Zahra Ebrahimi Nik; Hossein Abedi Ardakani
Abstract
Objectives: The aim of this study was to compare the maxillary sinus sizes in patients with maxillary excess and maxillary deficiency.
Methods: 120 cephalometric and panoramic radiographs of 12 - 25 years old patients were studied. These radiographs were derived from patients with maxillary deficiency, ...
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Objectives: The aim of this study was to compare the maxillary sinus sizes in patients with maxillary excess and maxillary deficiency.
Methods: 120 cephalometric and panoramic radiographs of 12 - 25 years old patients were studied. These radiographs were derived from patients with maxillary deficiency, normal, or excess. Each group consisted of 40 Patients, (20 females and 20 males). Different dimensions of maxillary sinus included maxillary sinus anterior posterior length (M.S.L), maxillary sinus height (M.S.H) and total maxillary sinus area (TMSA) were measured by digital lateral cephalometry and digital panoramic analysis. In AutoCAD program the lines were measured by mm and the area were measured (mm2). All input images into AutoCAD program converted to a unit scale to assess the minimal magnification error. Data were analyzed using t-test and ANOVA. Results: TMSA was highest in the maxillary deficiency group following by the maxillary normal and maxillary excess groups which the differences were statistically significant (P value = 0.008). However no significant differences were noticed by panoramic image measurements (P value = 0.285). The mean of MSH was significantly higher in the maxillary deficiency group compared with the maxillary normal and maxillary excess groups, both in lateral cephalometry (P value < 0.001) and panoramic images (P value = 0.034). Regarding the MSL no significant differences were seen among the study groups both in lateral cephalometry and panoramic images.
Conclusions: According to the result of this study TMSA and MSH were significantly higher in maxillary deficiency group in comparison with the maxillary normal and excess groups.
Mohammad Hossein Toode Zaeim; Soghra Yassaei; Hoori Mir Mohamad Sadeghi; Valiollah Rafiei
Abstract
Aim: A high percentage of the problems in finishing phase are due to tooth size imbalances that can be diagnosed in initial stages of treatment. The purpose of present study is to evaluate the frequency of anterior tooth size discrepancies by Bolton Analysis among class I, II and III malocclusions.Materials ...
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Aim: A high percentage of the problems in finishing phase are due to tooth size imbalances that can be diagnosed in initial stages of treatment. The purpose of present study is to evaluate the frequency of anterior tooth size discrepancies by Bolton Analysis among class I, II and III malocclusions.Materials and methods: The mesio-distal widths of six anterior teeth in 90 paired casts of patients (class I, II, and III), who were selected non-randomly, were measured. Chi-square test was performed to compare the frequency of anterior tooth size discrepancies between the three malocclusion groups. Analysis of variance was used to compare the mean anterior Bolton ratios as a function of skeletal anterior-posterior malocclusions and both genders. Mean mesio-distal width of six anterior teeth were compared by Analysis of variance in 3 skeletal malocclusion groups. Statistical differences were determined at the 95% confidence level.Results: Discrepancy was greater in class I and III than in class II. No sex difference was shown to exist in Bolton anterior ratio. mesio-distal width of upper laterals had greater variation coefficient.
Conclusion: Difference of mean anterior tooth size discrepancies among three skeletal class I, II and III malocclusions were not statistically significant.
Soghra Yassaei; Zohre Tabatabaei; Hossein Torabi
Abstract
Aim: Hyoid and its attached muscles involved in three basic functions: deglutition, phonation, respiration and control of pharyngeal spaces. The aim of this study was to valuate hyoid bone position in relation to facial growth pattern in class III malocclusion.Material and Methods: This was a retrospective ...
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Aim: Hyoid and its attached muscles involved in three basic functions: deglutition, phonation, respiration and control of pharyngeal spaces. The aim of this study was to valuate hyoid bone position in relation to facial growth pattern in class III malocclusion.Material and Methods: This was a retrospective descriptive analytical study, performed on lateral ccphalograms of fifty patients with class III malocclusion with prognathic profile. Cephalograms were classified to three facial growth pattern groups so each group comprised of minimum 15 samples. T-test and ANOVA were used to compare the difference of mean value of growth pattern groups. P< 005 was considered as the level of significance.Results: The difference between means of ANB angle (0.78 degree) were significant (P=0.027) in three facial growth pattern groups. The indices determining the growth pattern were significantly different in three facial growth pattern groups (P<0.001). The findings showed a significant difference in H-RGN between three facial growth pattern groups and also showed no significant difference in H-Pal P, H-SN, H-Mand P, H-C3 between three growth pattern groups.Conclusion: The anteroposterior position of hyoid bone related to cervical colunm was not affected by facial growth pattern. But its antroposterior position related to mandible was affected by facial growth pattern. There were significant differences between hyoid bone position in three facial growth patterns. Vertical position of hyoid bone was not affected by facial growth pattern.
