scholarly journals Tooth Size Discrepancies in an Orthodontic Population

2007 ◽  
Vol 77 (4) ◽  
pp. 668-674 ◽  
Author(s):  
Siti Othman ◽  
Nigel Harradine
Keyword(s):  
Tooth Size ◽  
Visual Estimation ◽  
Tooth Width ◽  
Size Discrepancy ◽  
Orthodontic Patients ◽  
Tooth Size Discrepancy ◽  
Size Correction ◽  
Clinically Significant ◽  
Low Sensitivity ◽  
Lower Arch

Abstract Objective: To explore how many millimeters of tooth size discrepancy (TSD) are clinically significant, to determine what percentage of a representative orthodontic population has such a tooth size discrepancy, and to determine the ability of simple visual inspection to detect such a discrepancy. Materials and Methods: The sample comprised 150 pretreatment study casts with fully erupted and complete permanent dentitions from first molar to first molar, which were selected randomly from 1100 consecutively treated white orthodontic patients. The mesiodistal diameter tooth sizes were measured using digital calipers, and the Bolton analysis and the tooth size corrections were calculated by the Hamilton Arch Tooth System (HATS) software. Simple visual estimation of Bolton discrepancy was also performed. Results: In the sample group 17.4% had anterior tooth-width ratios and 5.4% had total arch ratios greater than 2 of Bolton's standard deviations from Bolton's mean. For the anterior analysis, correction greater than ± 2 mm was required for 16% of patients in the upper arch or 9% in the lower arch. For the total arch analysis, the corresponding figures are 28% and 24%. Conclusions: It is recommended that 2 mm of required tooth size correction is an appropriate threshold for clinical significance. A significant percentage of patients have a TSD of this size. Visual estimation of TSD has low sensitivity and specificity. Careful measurement is more frequently required in clinical practice than visual estimation would suggest.

scholarly journals The relationship between tooth size discrepancy and archform classification in orthodontic patients

2015 ◽  
pp. e268-e272
Author(s):  
G. O’Mahony ◽  
DT Millett ◽  
MS Cronin ◽  
GT McIntyre ◽  
MK Barry
Keyword(s):  
Tooth Size ◽  
Size Discrepancy ◽  
Orthodontic Patients ◽  
Tooth Size Discrepancy ◽  
The Relationship

scholarly journals FGF10 and FGF13 genetic variation and tooth-size discrepancies

2021 ◽  
Author(s):  
Guido Artemio Marañón-Vásquez ◽  
Alexandre Rezende Vieira ◽  
Luiza Vertuan dos Santos ◽  
Arthur Silva Cunha ◽  
Suyany Gabriely Weiss ◽  
...  
Keyword(s):  
Recessive Model ◽  
Permanent Teeth ◽  
P Value ◽  
Tooth Size ◽  
Nucleotide Polymorphisms ◽  
Increased Risk ◽  
Size Discrepancy ◽  
Orthodontic Patients ◽  
Tooth Size Discrepancy ◽  
Mandibular Teeth

ABSTRACT Objectives To explore whether variations in odontogenesis-related genes are associated with tooth-size discrepancies. Materials and Methods Measurements of the width of permanent teeth were obtained from dental casts of 62 orthodontic patients (age 15.65 ± 6.82 years; 29 males and 33 females). Participants were classified according to the anterior and overall Bolton ratios as without tooth-size discrepancy or with maxillary or mandibular tooth-size excess. Genomic DNA extracted from buccal cells was used, and 13 single nucleotide polymorphisms (SNPs) across nine genes were genotyped by polymerase chain reaction using TaqMan chemistry. χ2 or Fisher exact tests were applied to determine the overrepresentation of genotypes/alleles depending on the type of tooth-size discrepancy (α = .05; corrected P value: P < 5.556 × 10−3). Odds ratios (ORs) and their correspondent 95% confidence intervals (CIs) were also calculated to investigate the risk of this phenotype for the SNPs having significant association. Results Individuals carrying the FGF10 rs900379 T allele were more likely to have larger mandibular teeth (OR = 3.74; 95% CI: 1.65–8.47; P = .002). This effect appeared to be stronger when two copies of the risk allele (TT) were found (recessive model, OR = 6.16; 95% CI: 1.71–22.16; P = .006). On the other hand, FGF13 rs5931572 rare homozygotes (AA, or male A hemizygotes) had increased risk of displaying tooth-size discrepancies when compared with the common homozygotes (GG, or male G hemizygotes; OR = 10.32; 95% CI: 2.20–48.26; P = .003). Conclusions The results suggest that FGF10 and FGF13 may contribute to the presence of tooth-size discrepancies.

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.

scholarly journals The tooth size discrepancy among orthodontic patients and normal occlusion individuals from Saudi Arabia: A three-dimensional scan analysis of diagnostic casts

2020 ◽  
Vol 11 (2) ◽  
pp. 141
Author(s):  
Sharaz Shaik ◽  
AbdulazizAbdullah Alshahrani ◽  
Ibrahim Alshahrani ◽  
MohamedKhaled Addas ◽  
FarisMohammed Binhomran ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Three Dimensional ◽  
Tooth Size ◽  
Normal Occlusion ◽  
Size Discrepancy ◽  
Orthodontic Patients ◽  
Tooth Size Discrepancy

scholarly journals Prevalence of tooth size discrepancy among North Indian orthodontic patients

2011 ◽  
Vol 2 (3) ◽  
pp. 170 ◽  
Author(s):  
Rekha Sharma ◽  
Anu Singla ◽  
Sushil Kumar
Keyword(s):  
Tooth Size ◽  
Size Discrepancy ◽  
Orthodontic Patients ◽  
Tooth Size Discrepancy

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 Tooth size discrepancy in orthodontic patients among different malocclusion groups

2009 ◽  
Vol 31 (6) ◽  
pp. 584-589 ◽  
Author(s):  
M. Strujic ◽  
S. Anic-Milosevic ◽  
S. Mestrovic ◽  
M. Slaj
Keyword(s):  
Tooth Size ◽  
Size Discrepancy ◽  
Orthodontic Patients ◽  
Tooth Size Discrepancy

A Rare Tooth Anomaly (Double Teeth) in Deciduous Teeth: A Case Report

2021 ◽  
Author(s):  
Fataneh Ghorbanyjavadpour
Keyword(s):  
Case Report ◽  
Lateral Incisor ◽  
Permanent Teeth ◽  
Deciduous Teeth ◽  
Tooth Size ◽  
Genetic Characteristics ◽  
Size And Shape ◽  
Size Discrepancy ◽  
Tooth Size Discrepancy ◽  
Double Teeth

Introduction: The Size and shape of the teeth are genetic characteristics. Anomaly in tooth size and shape is due to disturbances in a sequence of morph differentiation and his to differentiation in tooth bud formation periods and is more common in permanent dentition than deciduous teeth. The most common tooth size discrepancy is in the upper lateral incisor and upper and lowers 2nd premolar teeth. About 5% of malocclusions are due to tooth size discrepancy. For having the best occlusion, we must have the appropriate size and shape of teeth. As there is a relation between deciduous and permanent teeth, proper evaluation and timely intervention are essential for achieving a good occlusion in anterior and posterior segments of permanent teeth. Thus we need interceptive orthodontic in mixed dentition period with a good treatment plan for removing the malformed tooth at the proper time and appliance therapy for eruption guidance of other teeth. Case Report: A rare tooth anomaly (double teeth) in deciduous teeth: The case reported here is a 9- years old boy with a delayed eruption of the right lower permanent lateral incisor and gemination of lower right deciduous canine and crowded upper incisors that refer to the orthodontic department of dental school of Ahvaz Jundishapur University of Medical Sciences on7th October of 2020. Conclusion: After creating patient’s file, the further steps of molding from the patient and gathering all diagnostic records such as panoramic radiography, intraoral photography was carried out and ordered to remove the malformed baby tooth afterward. In the next stage, on the patient’s treatment, we installed a strap onto the patient’s first permanent molars, remolded them, then created a lingual arch to maintain the vegetative space in the lower permanent canine and prevent its collapse, and increased the patient’s overbite.

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