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 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 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 Overall and Anterior Tooth Size Ratios in a Group of Emiratis

2018 ◽  
Vol 12 (1) ◽  
pp. 655-663 ◽  
Author(s):  
Moaza Ghuloom Mohammad ◽  
Shazia Naser-ud Din ◽  
Amar Hassan Khamis ◽  
Athanasios E. Athanasiou
Keyword(s):  
Class Ii ◽  
Anterior Tooth ◽  
Class I ◽  
Tooth Size ◽  
Class Iii ◽  
Mean Values ◽  
Normal Occlusion ◽  
Size Discrepancy ◽  
Tooth Size Discrepancy ◽  
Dental Casts

Objectives:The aims of this investigation in a group of Emiratis were (1) To study overall and anterior tooth size ratios in Class I normal occlusion, (2) To estimate overall and anterior tooth size ratios in different malocclusion groups, (3) To compare overall and anterior tooth size ratios in Class I normal occlusion with the Bolton standards, and (4) To determine the distribution of overall and anterior tooth size ratios ± 2 SD from Bolton mean values in all occlusion groups.Materials and Methods:In this cross-sectional investigation, consecutive patients’ files, including dental casts, were selected from the archives of orthodontic clinics of the Dubai Health Authority. The final sample was formed following the application of specific inclusion criteria. The sample consisted of 521 pairs of dental casts representing both sexes (males: 188; females: 333) and different malocclusion groups (Class I: 288; Class II: 110; Class III: 30) and Class I normal occlusion (93). The mean age of patients was 16.18y for Class I, 15.73y for Class II, 15.83y for Class III, and 16.55y for Class I normal occlusion. The dental casts were scanned and digitized by the first author using the Ortho Insight 3D laser scanner. Measurements were made regarding maxillary and mandibular sums of mesiodistal tooth dimension of the overall (6-6) and anterior (3-3) groups of teeth. Statistical analysis included descriptive statistics, pairedt-test and Analysis of Variance (ANOVA). The level of significance was set atp<0.05.Results:There were statistically significant differences among malocclusion groups with regard to overall and anterior tooth size ratios. However, the comparison between the Class I normal occlusion group and the Bolton standards showed no statistically significant differences. Only five cases in Class II malocclusion presented an anterior tooth size discrepancy outside plus 2 SD from Bolton mean values and one case in Class I malocclusion presented with an overall tooth size discrepancy outside plus 2 SD from Bolton mean values.Conclusion:This study of the different occlusion groups of the Emirati sample concluded that (a) Class I normal occlusion cases presented similar overall and anterior tooth size ratios to Bolton standards; (b) Overall and anterior tooth size ratios among different malocclusion groups exhibited statistically significant differences; (c) Five cases in Class II malocclusion presented an anterior tooth size discrepancy outside plus 2 SD from Bolton mean values, and (d) One case in Class I malocclusion presented an overall tooth size discrepancy outside plus 2 SD from Bolton mean values.

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 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
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