Bolton discrepancy in an Iranian population and its relation with maxillary lateral incisors’ size
Journal Title: Electronic Physician - Year 2018, Vol 10, Issue 3
Abstract
BACKGROUND: Bolton's two main ratios describing the proportional size of upper and lower teeth, could contribute to estimating the excess or deficiency of tooth size necessary to obtain an ideal occlusion. However, the mean Bolton values are not the same among different societies. Determining the prevalence of tooth size deviations from population-specific Bolton indices might help local orthodontists to have a more concise treatment plan. OBJECTIVE: The study aimed to define the prevalence of clinically significant tooth size discrepancies (TSD) in an Iranian population and to evaluate the influence of lateral incisors' size on this discrepancy. METHODS: This cross-sectional study was conducted on study casts of orthodontic patients attending Imam Reza Dental Clinic from September 2008 to December 2016. The sample comprised of 150 randomly selected pre-treatment study casts (64 males and 86 females from 17 to 28). The mesiodistal diameter of all permanent teeth from the first molar on the right to the first molar on the left was measured using 2 similar digital calipers, and Bolton analysis was calculated. Subjective visual estimation of Bolton discrepancy was also performed. SPSS v18.0, Wilcoxon signed ranks test, Pearson correlation and Receiver Operating Characteristic (ROC) curve analysis were used for statistical analysis. A p<0.05 was considered statistically significant. RESULTS: In the sample group, 34.7% had anterior Bolton index (ABI) and 20.7% had total Bolton index (TBI) greater than 2 Standard Deviations (2SDs) of Bolton's means, and about half of them required correction of the ABI considering the actual size of discrepancies (mm). The sensitivity of estimating clinically significant tooth size discrepancy more than 2SDs of Bolton's ABI and the visual judgment was 96.0% and a cut-off point of -0.12mm was obtained. CONCLUSION: Bolton's analysis should be routinely performed in all orthodontic patients, and visual estimation of TSD would be suggested as a screening method in the first visit prior to measurements and set-ups
Authors and Affiliations
Shabnam Ajami, Hamidreza Fattahi, Mahsa Zare, Peyman Jenabi
Assessment of refractive outcome of femtosecond-assisted LASIK for hyperopia correction
INTRODUCTION: Laser vision correction for hyperopia is challenging. The purpose of the study was to assess the refractive outcomes of femtosecond-assisted laser in situ keratomileusis (LASIK) for hyperopic correction usi...
Effects of some insecticides on longevity of the foragers honey bee worker of local honey bee race Apis mellifera jemenatica.
Honeybees are constantly exposed to a wide range of vital and non-vital pressures that may interact with each other and affect the health or survival of the insects. Pesticides are the main danger for the insects, and th...
Awareness of and attitude towards blood donation in students at the Semnan University of Medical Sciences
BACKGROUND: Despite the increasing demands for blood and its products, some people, especially the youth, have little interest in donating blood. OBJECTIVE: This study aimed to assess the university students' awareness...
Early predictors of neonatal intraventricular hemorrhage
OBJECTIVE: Current study aimed toward the early prediction of neonatal intraventricular hemorrhage (IVH) for better management and prognosis. METHODS: This prospective study was conducted on forty neonates at the Neonat...
A new strategy in neurocritical care nurse continuing stroke education: A hybrid simulation pilot study
INTRODUCTION: High-fidelity simulation is frequently utilized in medical education. Its use in the neurosciences is limited by the inherent limitations of the manikin to simulate neurological changes. We report here the...