scholarly journals Tooth Size Discrepancies among Different Malocclusions in a Bangladeshi Orthodontic population

2013 ◽  
Vol 2 (2) ◽  
pp. 8-17 ◽  
Author(s):  
Md Liakat Ali Hyder ◽  
MSA Mamun ◽  
MZ Hossain
Keyword(s):  
Sex Differences ◽  
Nonparametric Test ◽  
Tooth Size ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Test Analysis ◽  
Clinically Significant ◽  
Overall Ratio ◽  
Anterior Posterior ◽  
Wilcoxon Nonparametric Test

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 any group, Significant anterior and overall tooth size discrepancies outside 2 SD from the Bolton's means were found in 31% and11.6% of all malocclusion subjects respectively. Conclusion: Bolton's values can be used with confidence for the Bangladeshi orthodontic population. DOI: http://dx.doi.org/10.3329/bjodfo.v2i2.16158 Ban J Orthod & Dentofac Orthop, April 2012; Vol-2, No.2, 8-17

scholarly journals Tooth Size Discrepancies among Different Malocclusions in a Japanese Orthodontic Population

2008 ◽  
Vol 78 (6) ◽  
pp. 994-999 ◽  
Author(s):  
Toshiya Endo ◽  
Ryota Abe ◽  
Hiroo Kuroki ◽  
Kenji Oka ◽  
Shohachi Shimooka
Keyword(s):  
Sex Differences ◽  
T Test ◽  
Class I ◽  
Tooth Size ◽  
Class Iii ◽  
Test Analysis ◽  
Size Correction ◽  
Clinically Significant ◽  
Overall Ratio ◽  
Student’S T

Abstract Objective: To identify the possible sex differences in anterior and overall tooth size ratios and to evaluate whether any differences exist in tooth size ratios and distributions of subjects with clinically significant tooth size discrepancies among Angle Class I, Class II, and Class III malocclusion groups with the corresponding skeletal characteristics in a Japanese population. Materials and Methods: Each malocclusion group comprised 60 subjects (30 males and 30 females). The mesiodistal width from first molar to first molar was measured on each pretreatment cast to the nearest 0.01 mm using digital calipers, and the anterior and overall ratios were calculated. Student's t-test, Welch t-test, analysis of variance, and χ2-test were performed for statistical analysis. Results: No statistically significant sex differences were found in anterior or overall ratio in any group. No significant differences in anterior or overall ratios were found among the malocclusion groups. No significant differences were found between the distributions of subjects with clinically significant tooth size discrepancies, categorized by the Bolton standard deviation definition and by the actual amount of change calculated for tooth size correction in millimeters, among the malocclusion groups except for the mandibular correction for the overall ratio between Class I and Class III subjects. Conclusion: Bolton's values can be used with confidence for the typical Japanese orthodontic population. The use of the actual millimeters of correction for the tooth size ratios could help orthodontists avoid underestimating the prevalence of clinically significant tooth size discrepancies.

scholarly journals Thresholds for Clinically Significant Tooth-Size Discrepancy

2009 ◽  
Vol 79 (4) ◽  
pp. 740-746 ◽  
Author(s):  
Toshiya Endo ◽  
Kenji Uchikura ◽  
Katsuyuki Ishida ◽  
Isao Shundo ◽  
Kosuke Sakaeda ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Clinical Significance ◽  
Tooth Size ◽  
Class Iii ◽  
Size Discrepancy ◽  
Tooth Size Discrepancy ◽  
Clinically Significant ◽  
Anterior Ratio ◽  
Overall Ratio ◽  
Large Groups

Abstract Objective: To determine an appropriate threshold for clinically significant tooth-size discrepancy using both a Bolton standard deviation (SD) definition and a millimetric definition. Materials and Methods: Mesiodistal tooth widths were measured in 250 pretreatment dental casts of patients with Class I, Class II, and Class III malocclusions. The anterior and overall ratios and the required amount of maxillary and mandibular corrections were calculated. The casts were divided into small, normal, and large groups according to the anterior and overall ratios categorized by the Bolton SD definition, and into small, normal, and large groups according to the required amount of maxillary and mandibular corrections expressed in millimeters. Results: The small and large anterior ratio groups which fell under the category of the 2 SD threshold did not always need maxillary or mandibular corrections greater than 2 mm, while the small and large overall ratio groups always needed maxillary and mandibular corrections greater than 2 mm. The small and large maxillary correction groups in the 2 mm threshold category did not always have anterior or overall ratios greater than 2 SDs from the Bolton mean. However, the small and large mandibular correction groups always had anterior ratios greater than 2 SDs and did not always have overall ratios greater than 2 SDs. Conclusions: The tooth-size discrepancies could be better expressed in terms of both percentage and actual amount of millimeters required for correction. The ratios outside 2 SDs from the Bolton mean and the discrepancies requiring more than 2 mm of maxillary and/or mandibular corrections are recommendable as the appropriate thresholds for clinical significance.

scholarly journals Analysis of Interarch Tooth Size Relationship in Nepalese Subjects with Normal Occlusion and Malocclusions

2019 ◽  
Vol 2019 ◽  
pp. 1-6
Author(s):  
Rajeev Kumar Mishra ◽  
Dashrath Kafle ◽  
Rahul Gupta
Keyword(s):  
Study Groups ◽  
Class Ii ◽  
Class I ◽  
Tooth Size ◽  
Class Ii Malocclusion ◽  
Normal Occlusion ◽  
Size Discrepancy ◽  
Clinically Significant ◽  
Anterior Ratio ◽  
Overall Ratio

Introduction. A proportional relationship between the maxillary and mandibular teeth size is required for achieving good finish with proper overjet and overbite postorthodontic treatment. The aims and objectives of this study were to determine the anterior and overall Bolton’s ratio in Nepalese population, to compare Bolton’s ratio between subjects with normal occlusion, Class I malocclusion, and Class II malocclusion, to compare these results with Bolton’s norm, and to determine the frequency of clinically significant (beyond 2 SD) tooth size discrepancy compared to Bolton’s norm. Materials and Methods. The study models of the subjects with normal occlusion and Angle’s Class I malocclusion and Class II malocclusion and fulfilling the inclusion criteria were retrieved from department archives. An electronic digital caliper was used to measure mesiodistal tooth size of the maxillary and mandibular teeth anterior to the second molars. The study sample of 120 study models consisted of the normal occlusion group (n = 31), Class I malocclusion group (n = 47), and Class II malocclusion group (n = 42). These measurements were then used to obtain Bolton’s ratio in three groups of subjects. Bolton’s ratio of study groups was compared with each other and with Bolton’s original ratio. Results. The differences in tooth size ratio of the study groups were not significant statistically, when the groups were compared on the basis of malocclusion or gender. Statistically significant differences were exclusively observed between the study groups and Bolton’s original sample for the anterior ratio. The frequency of the clinically significant tooth size ratio discrepancy was lower for the overall ratio (9.1%) compared to the anterior ratio (22.5%). Conclusions. Bolton’s analysis on the Nepalese population sample shows that there was no significant difference observed on the anterior and overall tooth size ratios when these were compared based on Angle’s malocclusion classes or gender. The clinically significant anterior tooth size discrepancy was more prevalent than that of the overall ratio.

scholarly journals Penatalaksanaan perawatan maloklusi dentoskeletal kelas III disertai crowding ringan dan masalah tooth size discrepancy menggunakan reduksi interproksimalManagement of Class III dentoskeletal malocclusion treatment with mild crowding and tooth size discrepancy problems using interproximal reduction

2020 ◽  
Vol 32 (1) ◽  
pp. 26
Author(s):  
Ni Luh Nyoman Ary Mayasari ◽  
Endah Mardiati
Keyword(s):  
Good Prognosis ◽  
Growth Spurt ◽  
Tooth Size ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Anterior Crowding ◽  
Straight Wire ◽  
Anterior Teeth ◽  
Size Discrepancy ◽  
Tooth Size Discrepancy

Pendahuluan: Pasien yang telah melewati masa tumbuh kembang dapat dirawat dengan perawatan ortodonti kamuflase atau bedah ortognati. Perawatan ortodonti kamuflase dengan hasil yang cukup baik dapat dilakukan jika diskrepansi skeletal tidak terlalu berat. Laporan kasus ini bertujuan untuk mengetahui keefektifan penatalaksanaan perawatan maloklusi skeletal kelas III dengan perawatan ortodonti kamuflase. Laporan kasus: Pasien perempuan, berusia 16 tahun 7 bulan, datang ke klinik PPDGS Ortodonti RSGM UNPAD dengan keluhan gigi depan tidak rapi dan gigi bawah terlihat lebih maju dibandingkan gigi rahang atas. Hasil diagnosis menunjukkan maloklusi dentoskeletal kelas III disertai asimetri wajah, palatum tinggi, pergeseran garis median rahang bawah, overjet terbalik, crossbite anterior, geligi berjejal, dan kurva Spee dalam. Pasien dirawat dengan straight wire appliance selama 1 tahun 8 bulan. Breket rahang atas dipasang terlebih dulu sampai overjet terkoreksi. Breket rahang bawah dipasang diikuti reduksi interproksimal. Pasien menggunakan elastik kelas III untuk koreksi relasi kaninus. Reduksi interproksimal menggunakan strip abrasif metal merupakan salah satu cara untuk mendapatkan ruangan pada kasus crowding ringan. Kombinasi reduksi interproksimal gigi anterior rahang bawah dan flaring gigi rahang atas, diikuti penggunaan elastik kelas III efektif mengoreksi overjet terbalik pada kasus maloklusi kelas III. Simpulan: Reduksi interproksimal dan elastik kelas III berhasil mengoreksi kasus maloklusi kelas III disertai crowding ringan dan masalah TSD.Kata kunci: Maloklusi, skeletal kelas III, crowding ringan, tooth size discrepancy (TSD), reduksi interproksimal. ABSTRACTIntroduction: Patient with dentoskeletal class III malocclusion, post-pubertal growth spurt, may be treated with orthodontic camouflage or orthognathic surgery. Camouflage treatment with good prognosis can have acceptable results if there is an only mild skeletal discrepancy. This report was aimed to investigate the effectiveness of camouflage treatment in dentoskeletal class III patient. Case report: A female patient, 16 y.o 7 months, came to Orthodontics Clinic of Universitas Padjadjaran Dental Hospital, complaining her anterior teeth looks crowded and her protrusive mandible. She was diagnosed with dentoskeletal class III malocclusion with asymmetrical face, high palate, midline shifting mandible, reverse overjet, crossbite anterior, crowding, and the deep curve of Spee. The patient was treated with straight wire appliance for one year and eight months. A lower bracket was bonded after anterior crossbite corrected, followed with interproximal reduction. Elastic class III was used to correct canine relationship. Interproximal reduction with metal abrasive is a common practice in orthodontic practice to gain spaces in mild crowding cases. Interproximal reduction in mandibular anterior teeth combined with anterior flaring of maxillary teeth, followed with elastic class III, effectively correct anterior crossbite in class III skeletal patient. Conclusion: Interproximal reduction and elastic class III effective to correct class III malocclusion with mild crowding and tooth size discrepancy problem.Keywords: Maloccusion, dentoskeletal class III, mild crowding, tooth size discrepancy (TSD), interproximal reduction.

Tooth size discrepancies in Class II division 1 and Class III malocclusion requiring surgical–orthodontic or orthodontic treatment

2014 ◽  
Vol 41 (2) ◽  
pp. 118-123 ◽  
Author(s):  
Timothy P McSwiney ◽  
Declan T Millett ◽  
Grant T McIntyre ◽  
Mark K Barry ◽  
Michael S Cronin
Keyword(s):  
Orthodontic Treatment ◽  
Class Ii ◽  
Tooth Size ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Division 1 ◽  
Class Ii Division 1

Intermaxillary tooth size discrepancies among different malocclusion classes: a comparative study

2002 ◽  
Vol 26 (4) ◽  
pp. 383-387 ◽  
Author(s):  
Eman Alkofide ◽  
Hayder Hashim
Keyword(s):  
Size Analysis ◽  
Tooth Size ◽  
Class Iii ◽  
Mean Values ◽  
Normal Occlusion ◽  
Significant Difference ◽  
Important Diagnostic Tool ◽  
Males And Females ◽  
Anterior Ratio ◽  
Overall Ratio

The purpose of this study is to determine whether a difference exists in intermaxillary tooth size among different malocclusion groups in Saudi patients. The study consisted of 240 pretreatment orthodontic casts (Sixty cases in each malocclusion class, in addition to normal occlusion). The results of the study shows no significant difference in the incidence of tooth size discrepancies for the overall ratio and anterior ratio between the different malocclusion groups, except for the anterior ratio in class III malocclusion. Further, no statistical significant difference was observed between males and females. When the mean values of the present study were compared to that of Bolton's, a significant difference was found in all the malocclusion classes.We can conclude from this study that Bolton tooth size analysis is an important diagnostic tool, and should be taken into consideration before initiation of orthodontic treatment.

Sex differences in pharyngeal airway morphology in adults with skeletal Class III malocclusion

CRANIO® ◽  
2017 ◽  
Vol 36 (2) ◽  
pp. 98-105 ◽  
Author(s):  
Maria Fernanda Rabelo Bozzini ◽  
José Valladares-Neto ◽  
João Batista de Paiva ◽  
José Rino-Neto
Keyword(s):  
Sex Differences ◽  
Class Iii ◽  
Class Iii Malocclusion ◽  
Skeletal Class ◽  
Pharyngeal Airway ◽  
Airway Morphology

scholarly journals Bolton’s Tooth Size Discrepancy in Malaysian Orthodontic Patients: Are Occlusal Characteristics Such as Overjet, Overbite, Midline, and Crowding Related to Tooth Size Discrepancy in Specific Malocclusions and Ethnicities?

2018 ◽  
Vol 8 ◽  
pp. 36-43 ◽  
Author(s):  
Priti Subhash Mulimani ◽  
Myra Innessa Binti Azmi ◽  
Nabilah Rashida Jamali ◽  
Nur Najaa Binti Md Basir ◽  
Htoo Htoo Kyaw Soe
Keyword(s):  
Tooth Size ◽  
Class Iii ◽  
Midline Shift ◽  
Entire Study ◽  
Significant Difference ◽  
Size Discrepancy ◽  
Orthodontic Patients ◽  
Tooth Size Discrepancy ◽  
Anterior Ratio ◽  
Overall Ratio

Introduction Tooth size, occlusal traits, and ethnicity are closely interrelated, and their impact on desirable orthodontic treatment outcome cannot be underestimated. This study was undertaken to assess the occlusal characteristics and ethnic variations in occlusion of Malaysian orthodontic patients and evaluate their correlation with Bolton’s tooth size discrepancy. Materials and Methods On 112 pretreatment study models of orthodontic patients, molar relationship, overjet, overbite, spacing, crowding, midline shift, and Bolton’s ratios were assessed. ANOVA, one-sample t-test, Chi-squared test, and Spearman’s rho correlation coefficient were used for statistical analysis. Results Significant difference between anterior ratio of our study and Bolton’s ideal values was found, for the entire study sample and Chinese ethnic group. Differences between races and malocclusion groups were not statistically significant (P > 0.05). Significant correlations were found as follows – in Angle’s Class I malocclusion between 1) anterior ratio and overbite, 2) overall ratio and maxillary crowding and spacing; in Angle’s Class II malocclusion between 1) anterior ratio and overjet and midline shift, 2) overall ratio and mandibular crowding; in Angle’s Class III malocclusion between 1) anterior ratio and mandibular crowding and both maxillary and mandibular spacing 2) overall ratio and mandibular crowding. Conclusions Significant differences in anterior ratio and Bolton’s ideal values for the Malaysian population were found, indicating variations in anterior tooth size as compared to Caucasians. Statistically significant correlations existed between Bolton’s ratios and occlusal traits. These findings can be applied clinically in diagnosis and treatment planning by keeping in mind the specific discrepancies that can occur in certain malocclusions and addressing them accordingly.

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