A Comparison of Morphometric Parameters Observing Tooth Size Discrepancies and Archwidth Among the Indian and Iranian Population- a Pilot Approach (original) (raw)
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Tooth size discrepancies and arch parameters among different malocclusions in a Jordanian sample
The Angle orthodontist, 2006
The objectives of this study were to determine the mean mesiodistal tooth width of the dentition, Bolton anterior and overall ratios, arch length, and arch width in the different malocclusions in a Jordanian sample. The mesiodistal tooth width, arch width, and length were measured on a total of 140 orthodontic models of school students aged 13-15 years of different occlusal relationships (Class I, Class II division 1, Class II division 2, and Class III malocclusions). Anterior and overall Bolton ratios were calculated. The mean and standard deviation were calculated. Student's t-test and analysis of variance were used for the statistical analysis. The results show that (1) females have smaller teeth than males; (2) Class III malocclusion showed larger teeth than the rest of the other occlusal categories; (3) no statistically significant differences were found in Bolton ratios between the different malocclusions; (4) Class II division 1 showed the narrowest maxillary arch compare...
Tooth Size Discrepancies among Different Malocclusions in a Bangladeshi Orthodontic population
Bangladesh Journal of Orthodontics and Dentofacial Orthopedics, 2013
Objectives: To identify the possible sex differences in anterior, posterior, and overall tooth size ratios and to evaluate whether any differences exist in tooth size ratios and distribution of subjects with clinically significant tooth size discrepancies among Angle class I, class II, & class III malocclusion groups in Bangladeshi Orthodontic population. Materials and Methods: Each malocclusion group comprised 40 subjects (20 males and 20 females).The mesiodistal width from first molar to first molar were measured on each pretreatment cast to the nearest 0.01mm using digital calipers, and the anterior, posterior and overall ratios were calculated. Students t-test, Wilcoxon nonparametric test, analysis of variance, and x2-test were performed for statistical analysis. Results: No statistically significant differences in anterior, posterior, or overall ratios were found among the malocclusion groups. No significant sex differences were found in anterior, posterior, or overall ratio in...
An evaluation of tooth size discrepancies among different malocclusion groups in North Indians
Journal of Orthodontic Research, 2015
Objective: A study was conducted to evaluate tooth size discrepancies among different malocclusion groups. Materials and Methods: This study consisted of 160 North Indian subjects, 50 normal occlusion group and 110 subjects with varying degree of malocclusion, that is, Angle's Class I (40), Class II Division 1 (40) and Class III (30) malocclusion, respectively. Tooth size measurements were performed on the study models by using a digital Caliper with a liquid crystal display digital output to the nearest 0.01 mm, and various inter-arch ratios were analyzed. Statistical Analysis: One-way analysis of variance was used to analyze the difference in groups followed by Tukey post hoc test. Chi-square test was performed to demonstrate the prevalence of tooth size discrepancies among three malocclusion groups. Results: Signifi cant differences were found for inter-arch ratios between the groups. Conclusions: Anterior, overall, and posterior ratios were higher in Class III followed by Class I and Class II Division 1 malocclusion, respectively. Anterior and overall tooth size discrepancy was found to be 20% and 17.2%, respectively, in the malocclusion sample.
Bolton ratio in a North Indian population with different malocclusions
Journal of Orthodontic Science, 2015
Objective: The objective was to evaluate the Bolton ratio in a North Indian population in Lucknow with different malocclusion. Materials and Methods: Totally, 110 study cast [Age: Female (14.2 ± 1.5 years, Male (13.9 ± 2.3 years)] were taken from the patients undergoing orthodontic treatment and Subjects were divided into three groups: Group I (Angle's Class I, n = 40), Group II (Angle's Class II, n = 50) and Group III (Angle's Class III, n = 20) according Angle's classification of malocclusion. The mesiodistal widths of all maxillary and mandibular teeth from right first molar to left first molar were measured with a digital caliper to calculate the Bolton ratio. The readings were then used to compute the anterior and total Bolton ratios. ANOVA and Tukey's test were used for the statistical analysis. Results: A mean total Bolton ratio of 91.36 ± 2.13 and a mean anterior Bolton ratio of 78.14 ± 4.09 were found for the sample, Significantly higher mean anterior tooth ratios were found for Group II (Angle's Class II) patients (P < 0.01). All other ratios were within close range of Bolton's norms. Conclusions: Angle's Class II patients showed a tendency toward wider mesiodistal widths of teeth in the mandibular anterior region or smaller tooth sizes in the maxillary anterior region.
Relationship between tooth size discrepancies and malocclusion
Stomatologija Issued By Public Institution Odontologijos Studija Et Al, 2009
The main goal in comprehensive orthodontic treatment is to obtain optimal final occlusion, overbite and overjet. Tooth size discrepancies of the maxillary and mandibular arches is an important factor for achieving this goal. The aim of this study was to determine the relationship between the Bolton overall and anterior ratio and the relationship between first molars according to the Angle classification, and the size of overjet and overbite. The study sample consisted of 181 pretreatment dental casts with fully erupted and complete permanent dentitions from first molar to first molar, which were selected randomly. The evaluation of the Bolton anterior ratio showed that anterior ratio ranged between 66.038% and 96.907%, mean value - 77.889+/-4.296. The lowest mean value of the Bolton anterior ratio was in Angle Class II, and the highest - in Angle Class III, but this difference was not statistically significant. The evaluation of the Bolton overall ratio showed that the overall ratio ranged between 85.648% and 98.907%, mean value - 92.735+/-2.489. The lowest mean value of the Bolton overall ratio was in Angle Class II, and the highest - in Angle Class III, but this difference was not statistically significant. Moderate correlation was detected between the Bolton overall ratio and overjet (r=-0.45, p<0.001) The evaluation of the relationship between the Bolton overall ratio and overbite showed that a statistically reliable weak correlation (r=0.18, p<0.001). The evaluation of the Bolton ratio is clinically important and affects the planning of orthodontic treatment.
Al-Rafidain Dental Journal, 2021
Aims: The study aimed to evaluate the overall and anterior Bolton's ratio between females and males of the Kurdistan population, and then compare it to Bolton's original ratio. Materials and methods: This crosssectional study consisted of 160 orthodontic models (80 males, 80 females) that randomly selected from the Kurdistan Iraq population for patients seeking orthodontic treatment, ranging in age from 16 to 34 years. After evaluating the width of each tooth separately using digital caliper, anterior and total ratios were calculated by a formula presented by Bolton. Results: The study's overall Bolton's ratio was significantly higher for both females and males at 92.54 and 91.73, respectively, when compared to that of Bolton's original value of 91.3; the anterior Bolton's ratio was also significantly higher at 79.97 for males & 79.22 for females, when compared to that of Bolton's original value of 77.2. The high significant difference was observed between the current study and Bolton's ratios, with p-value of 0.01, whereas no significant gender differences in any malocclusion group have been found. Conclusions: No gender effect on Bolton's ratios among all Angle's classification types.
Evaluation and comparison of tooth size discrepancies among different malocclusion groups
South European Journal of Orthodontics and Dentofacial Research, 2016
Introduction: The compliance of proportions between the mesiodistal dimensions of the upper and the lower teeth is necessary for good intercuspidation. Given that a significant discrepancy in tooth size can prevent ideal occlusion at the end of orthodontic treatment, the absence of tooth size discrepancy is a significant factor for the realization of the ideal occlusion. The aim: Aim of this study was to determine whether there is a difference in the incidence of tooth size discrepancies among different skeletal malocclusion groups in the orthodontic patients. Material and methods: The sample comprised 300 pretreatment study casts (118 males and 182 females) with fully erupted and complete permanent dentition except third molars, which were selected randomly from records of orthodontic patients. All subjects were divided in three groups, according to the Angle classification of malocclusion. The measurements were made on study models with digital calipers accurately to 0.01 mm.The Class was defined by using the Steiner analysis on lateral cephalograms.The subjects were divided into three groups depending on the value of the ANB angle. For every subject, the value of the angles SNA, SNB and ANB was measured.The reliability of measurements was examined by the Pearson's correlation coefficient. To determine whether there were gender differences an independent sample t-test was performed. Results: There is no statistically significant differences in Bolton's discrepancy by different gender, or at different classes. The average value of the anterior Bolton ratio was 78.16 and of the overall were 90.87. Values of the anterior and overall Bolton ratios are highest in patients with Class III. The highest average value of anterior discrepancy was in male subjects with III Class (-0.72), while the highest average value of overall discrepancy was in male subjects with II Class (0.65). Conclusion: The results of the study show that there are no statistically significant differences in Bolton's discrepancy by different gender, or at different classes.
Journal of Oral Health and Community Dentistry, 2019
Patients attending orthodontic clinics normally complain of crowding or spacing or both, which represents big esthetic and functional problems. The link between the upper and lower teeth sizes and its repercussions on the occlusal harmony of these dental arches is a cause of major concern in orthodontic treatment. Hence, this study is carried out to compare the anterior and overall ratios of tooth sizes in different types of Angle's malocclusions. For this study, we examined and selected 100 patients from the
2018
Aim & Objectives: to compare the intercanine, intermolar and alveolar width among Class I, Class II div 1, Class II div 2 and Class III malocclusion for arch widths, the width of the maxillary and mandibular arches, gender dimorphism within groups, and gender comparisons in central India population. Methods: a cross-sectional study was comprised of patients pre-treatment study casts of 60 Class I, 40 class II div 1, 30 class II div 2 and 30 class III malocclusions. An electronic digital Vernier caliper with fine tips measuring within 0.01 mm (Aerospace) is used in this study to measure the parameters on the maxillary and mandibular study models. All subjects resided in central India with no history of orthodontic treatment. An analysis of variance test was used to compare the different malocclusion groups and genders. Result: Among the all comparison groups class I malocclusion group showed maximum maxillary inter canine, inter molar and alveolar width while class III group showed m...
Comparison of tooth size discrepancies among different malocclusion groups
The European Journal of Orthodontics, 2006
This retrospective investigation was designed to compare tooth size discrepancies among subjects with different skeletal malocclusions in an orthodontic population. The study employed the pretreatment models of 200 patients (100 males, 100 females, aged from 14 to 20 years) selected from the records of the Orthodontic Department, Shiraz Dental School. The subjects were from four malocclusion groups, Class I, Class II division 1, Class II division 2, and Class III, with the corresponding skeletal characteristics. Each group comprised 50 healthy individuals (25 males, 25 females). The mesio-distal dimensions of teeth were measured using digital electronic callipers (accurate to 0.01 mm) and the Bolton indices were determined. The data were statistically analysed using analysis of variance and Duncan's multiple range test, with the level of signifi cance set at P < 0.05.