Orthodontics
Almamoon Khan; Nazir Ahmad; Arsalan Hamid Khan; Aasim Mahmood
Abstract
Aim: The aim of this retrospective study was to evaluate the maxillary transverse dimensions in individuals with palatal impacted maxillary canines relative to the control group without dental impactions using cone-beam computed tomography(CBCT). Methods: Sixty CBCT images of the individuals were ...
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Aim: The aim of this retrospective study was to evaluate the maxillary transverse dimensions in individuals with palatal impacted maxillary canines relative to the control group without dental impactions using cone-beam computed tomography(CBCT). Methods: Sixty CBCT images of the individuals were classified into two groups: 29 in the palatal impacted canine group and 31 in the control group. To determine the maxillary width at four levels, CBCT DICOM files were processed using the software OnDemand 3D to analyze maxillary transverse parameters. Basal width at molar (BWM), alveolar width at first molar (AWM), basal width at premolar (BWPM), and alveolar width at premolar (AWPM) were the four levels at which the maxillary transverse dimensions were measured. The independent T- test was utilized when comparing the impacted canine group and the control group. The level of statistical significance was set at a P-value less than 0.05 for all tests.Results: Regarding the transverse maxillary measurement, there was no significant difference between the impacted canine group and the control group for the BWM, BWPM, and AWPM (P≥0.05). For the AWM, statistically significant differences were not found between the maxillary palatal impacted canine group and the control group (P=0.05).Conclusion: No significant differences were observed between the impacted canine group and the control group in terms of maxillary transverse dimensions. Further research is needed to explore the relationship between maxillary canine impaction and maxillary transverse dimensions.
Orthodontics
Kazem Dalaie; Shabnam Dadkhah; Mohammad Behnaz; Yaser Safi; Soodeh Tahmasbi; Yasamin Vazirizadeh
Abstract
Aim: This study aimed to assess the relationship of upper pharyngeal airway volume with tongue position in different sagittal and vertical skeletal patterns using cone-beam computed tomography (CBCT).Methods: CBCT images of 225 participants (149 females, 76 males) over 18 years of age were evaluated ...
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Aim: This study aimed to assess the relationship of upper pharyngeal airway volume with tongue position in different sagittal and vertical skeletal patterns using cone-beam computed tomography (CBCT).Methods: CBCT images of 225 participants (149 females, 76 males) over 18 years of age were evaluated in three groups with sagittal Class I, II, and III skeletal patterns. Class I and II individuals were subdivided into three vertical subgroups high angle, normal, and low angle. The CBCT scans were evaluated three-dimensionally, and the volume of the lower nasopharynx (LNP), oropharynx (ORP), and velopharynx (VLP) was calculated in addition to the total upper pharyngeal airway volume (TV). The tongue position (according to Graber’s analysis and D1-D5 and D1’-D5’ lines) was determined, and the tongue height (TGH) was measured. Data were analyzed by one-way and two-way ANOVA, Tukey’s test, and Pearson’s and Spearman’s correlation tests (a=0.05).Results: The volume of the LNP was significantly larger in Class II than in Class III patients (P<0.05). VLP volume (r>0.5, P<0.05) and TV (r>0.5, P<0.05) in Class I high angle participants had a significant correlation with D1.Conclusion: The present results showed greater LNP volume in Class II than in Class III individuals. In some variables (VLP, ORP, TV, intraoral airway volume) no significant difference was observed between different sagittal and vertical groups. Most of the airway variables (TV, VLP, ORP) had no correlations with some tongue variables (TGH, D1, D3, D4, D4’, D5, intraoral airway volume) in different skeletal patterns.
Orthodontics
Mahesh Jain; Dolly Patel
Abstract
Aim: With the increased use of cone beam computed tomography (CBCT) scans in orthodontic diagnosis and treatment planning, validation of using radiographic images obtained from CBCT instead of multiple conventional radiographs is needed. Hence, the present study was designed to assess the differences ...
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Aim: With the increased use of cone beam computed tomography (CBCT) scans in orthodontic diagnosis and treatment planning, validation of using radiographic images obtained from CBCT instead of multiple conventional radiographs is needed. Hence, the present study was designed to assess the differences between cephalometric measurements taken from manual tracings (MT), digitized lateral cephalograms (DLC) and CBCT lateral cephalograms scansMethods: Conventional lateral cephalograms and CBCT scans from ten subjects from departmental archives were used to assess the three methods: manual tracings, digitized lateral cephalograms, and CBCT lateral cephalograms. Seventeen measurements were evaluated and retraced after a 7-day period. The intra examiner errors was assessed using the paired t test and Dahlberg formula. The Pearson correlation test and ANOVA test evaluated the differences between the methods.Results: Most of the measurements had intra-examiner reliability in all three methods. Measurements were significant among methods were Y-axis, U1-Apog (degree and mm), U1-NA, L1-NB (degree and mm), L1-Apog, and interincisal angle.Conclusion: All three methods proved to be reliable and reproducible with minimum error in the measurement of lateral cephalograms. The CBCT scan, advised for complex cases, can be used to generate lateral cephalogram images, which may reduce the need for multiple radiographs, thereby reducing radiation exposure and cost.
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 ...
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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.
