Orthodontics
Foroozan Farahbod; Sepideh Dadgar; Farhad Sobouti; Ali Malekzadeh Shafaroudi; Sajad Yousefi; Ali Nowruzy
Abstract
Background: Superimposition of left and right structures is an issue in lateral cephalometric radiographs in dentistry, making it challenging to measure structures, including the gonial angle. Panoramic radiography contains fewer superimposing structures; therefore, it could measure the gonial angle. ...
Read More
Background: Superimposition of left and right structures is an issue in lateral cephalometric radiographs in dentistry, making it challenging to measure structures, including the gonial angle. Panoramic radiography contains fewer superimposing structures; therefore, it could measure the gonial angle. This study aimed to compare the gonial angle in panoramic and lateral cephalometric radiographs in different skeletal patterns.Methods: In this cross-sectional study, 240 panoramic and lateral cephalometric radiographs were collected from the archives of Sari Dental School. The gonial angle of each radiograph was traced and measured with a conveyor. Data analysis was performed using ANOVA and paired t-test, and P-value <0.05 were considered significant.Results: The paired t-test of the gonial angle did not show a statistically significant difference between different skeletal groups when measured using panoramic and lateral cephalometric radiographs. According to the results, the p-value of the difference between the right and left gonial angles in skeletal class III patients (p=0.019) was obtained larger than the test level (p=0.05). Therefore, it can be concluded that there is a statistically significant difference between the size of the left and right gonial angles in panoramic radiographs of skeletal class III patients. Conclusion: Panoramic radiography can be an accurate alternative to lateral cephalometric radiographs for measuring the gonial angle in different skeletal patterns due to the lower radiation it exposes to the patient.
Amirfarhang Miresmaeili; Shahriar Shahab; Faezeh Yousefi; Vahid Mollabashi
Abstract
Aim: Tooth size in panoramic view has both magnification and distortion. It is supposed that panoramic view generated from Cone Beam computed tomography (CBCT) has more accurate tooth size compared with conventional panoramic view. The purpose of this study was to compare magnification of mandibular ...
Read More
Aim: Tooth size in panoramic view has both magnification and distortion. It is supposed that panoramic view generated from Cone Beam computed tomography (CBCT) has more accurate tooth size compared with conventional panoramic view. The purpose of this study was to compare magnification of mandibular tooth size in digital panoramic radiographs andCBCT reconstructed panoramic images.
Materials and Methods: Amongpatients referred to Hamadan dental school, having both digital panoramic radiograph and CBCT, 28 patients were selected. Maximum width and length of mandibular teeth No. 36,34,33,31,41,43,44, 46 were measured in digital panoramic views and in CBCT reconstructed panoramic views. The CBCT images in multiple planes were used to give the dimensions referred to as gold standard. MANOVA test, Post Hoc and Tukey were used for statistical analysis.Results: There was a significant difference in width and length of teeth between digital panoramic view and both reconstructed panoramic view and gold standard (P value< 0.05). In digital panoramic view the maximum and minimum of magnification was observed in incisors and molar teeth respectively. There were no statistical differences in width and length measurements between reconstructed panoramic view and gold standard except for magnification in incisor teeth width (P value> 0.05). Conclusion: CBCT reconstructed panoramic views show significantly less magnification regarding tooth size compared with digital panoramic views.
Esfandiar Akhavan Niaki; Roshanak Montazeri Hedeshi
Abstract
OBJECTIVE: as regards to prevalence of mouth breathing and its complications, The panoramic view of children with mouth breathing as a routine initial accessible radiographic examination, was assessed in the present study; considering Confounding factors such as the magnification, dimensional changes, ...
Read More
OBJECTIVE: as regards to prevalence of mouth breathing and its complications, The panoramic view of children with mouth breathing as a routine initial accessible radiographic examination, was assessed in the present study; considering Confounding factors such as the magnification, dimensional changes, type of the x-ray machine and head position during imaging. We tried to innovate new standardization of nasal cavity analysis in panoramic radiography, in addition to creating specified and reliable new parameters, and investigate if there are significant differences between these parameters in mouth breathing patients than in those with nasal breathing. METHODS: This wasa control and analytical study which assessed 30 patients with Mouth breathing and 30 patients with nasal breathing, in the range of 9-12 years old with equal numbers of both sexes, in both groups. After tracing panoramic radiographs, five angular and proportional variables was created and measured, T-test was performed and the level of significance was evaluated. For investigation of nasal septum deviation, we used Chi-square test.RESULT: "NL" and "NL/B" parameters and unclear irregular view ofnasal cavity ininternal structures, showed significant differences in mouth breathing group (P.Value < 0.5). Right and left nasal cavity width in each patient, separately in two groups- mouth breathing and normal breathing- showed no significant differences. CONCLUSION: Due to availability and benefits of panoramic radiography,the proportional and angular parameters used, were reliable for assessment of nasal cavity in mouth breathing children and could be developed in future studies for diagnosis of mouth breathing children.
Mohammad Hossein Toodeh zaim; Hossein Ahga Aghili; Zohre Tahatabaei; Zahra Yousefzade
Abstract
Aim: Prediction of mesiodistal width of unerupted permanent canines and premolars in mixed dentition period is necessary for space analysis. Use of panoramic radiographs instead of periapical radiographs in space analysis decreases the cost and X-ray exposure. The aim of this study was prediction of ...
Read More
Aim: Prediction of mesiodistal width of unerupted permanent canines and premolars in mixed dentition period is necessary for space analysis. Use of panoramic radiographs instead of periapical radiographs in space analysis decreases the cost and X-ray exposure. The aim of this study was prediction of mesiodistal width of unerupted permanent canine and premolars by panoramic radiographs.Materials and Method: Panoramic radiographs and dental casts of 60 orthodontic patients were selected. The largest mesiodistal width of dental crown of upper and lower canines and premolars on the panoramic and dental cast and also mesiodistal width of lower incisors on dental cast were measured, SPSS was used and data were analyzed by Pearson's coefficient correlation between panoramic, cast and linear regression analysis and paired sample T-test.Results: R for predication of total unilateral mesiodistal width of permanent canine and premolars from cast and panoramic in upper jaw was 0.589 and in lower jaw was 0.69l. R for prediction of mesiodistal width for unerupted canine and premolars by use of lower incisors width from dental cast and radiographic width of upper permanent canine for upper jaw and lower second premolar far lower jaw were respectively 0.664 and 0.999.Conclusion: Based on introduced linear equation for prediction of mesiodistal width of canine and premolars, the best equation resulted from use of lower incisor width from dental cast and one radiographic agent which is canine in upper arch and second premolar in lower arch.
