Corrected and Republished Applicability of Boston University approach for prediction of mesiodistal width of canines and premolars in the primary schoolchildren of rural Bengaluru An in vivo study

Introduction: Boston University (BU) approach is a method for early prediction of unerupted permanent mandibular teeth widths based on the mesiodistal widths (MDWs) of primary mandibular canines and first molars. The present study was conducted to test the validity of BU approach by comparing it with Tanaka–Johnston (T/J) approach in the contemporary population. Aims and Objective: The aim of the study was to determine the applicability of BU approach for prediction of the MDWs of canines and premolars in the primary schoolchildren of rural Bengaluru. Materials and Methods: The study was conducted in 100 healthy schoolchildren of rural Bengaluru aged between 7 and 11 years. The MDWs of canines and premolars were predicted using both T/J and the considered BU approaches for all the children and were compared. Results: The correlation coefficient showed a statistically significant correlation between the predicted tooth size from the two predicted methods in the upper and lower arches (P < 0.001), with Pearson's correlation coefficient showing the very strong positive relationship (r = 0.7). Significant differences were seen between the mean predicted width of canines and premolars by both the approaches (P < 0.001). Conclusion: In spite of the limitations, we recommend the use of BU approach to predict arch length-tooth material discrepancy at an early age and to get at least an approximate estimation of the required space. We also advocate the necessity of further research on this approach prospectively.

Applicability of Boston University approach for prediction of mesiodistal width of canines and premolars in the primary schoolchildren of rural Bengaluru An in vivo study

Introduction: Boston University (BU) approach is a method for early prediction of unerupted permanent mandibular teeth widths based on the mesiodistal widths (MDWs) of primary mandibular canines and first molars. The present study was conducted to test the validity of BU approach by comparing it with Tanaka–Johnston (T/J) approach in the contemporary population. Aims and Objective: The aim of the study was to determine the applicability of BU approach for prediction of the MDWs of canines and premolars in the primary schoolchildren of rural Bengaluru. Materials and Methods: The study was conducted in 100 healthy schoolchildren of rural Bengaluru aged between 7 and 11 years. The MDWs of canines and premolars were predicted using both T/J and the considered BU approaches for all the children and were compared. Results: The correlation coefficient showed a statistically significant correlation between the predicted tooth size from the two predicted methods in the upper and lower arches (P < 0.001), with Pearson's correlation coefficient showing the very strong positive relationship (r = 0.7). Significant differences were seen between the mean predicted width of canines and premolars by both the approaches (P < 0.001). Conclusion: In spite of the limitations, we recommend the use of BU approach to predict arch length-tooth material discrepancy at an early age and to get at least an approximate estimation of the required space. We also advocate the necessity of further research on this approach prospectively.

New prediction equations for the estimation of maxillary mandibular canine and premolar widths from mandibular incisors and mandibular first permanent molar widths: A digital model study / 대한치과교정학회지

OBJECTIVE: The primary aim of the study was to generate new prediction equations for the estimation of maxillary and mandibular canine and premolar widths based on mandibular incisors and first permanent molar widths. METHODS: A total of 2,340 calculations (768 based on the sum of mandibular incisor and first permanent molar widths, and 1,572 based on the maxillary and mandibular canine and premolar widths) were performed, and a digital stereomicroscope was used to derive the the digital models and measurements. Mesiodistal widths of maxillary and mandibular teeth were measured via scanned digital models. RESULTS: There was a strong positive correlation between the estimation of maxillary (r = 0.85994, r2 = 0.7395) and mandibular (r = 0.8708, r2 = 0.7582) canine and premolar widths. The intraclass correlation coefficients were statistically significant, and the coefficients were in the strong correlation range, with an average of 0.9. Linear regression analysis was used to establish prediction equations. Prediction equations were developed to estimate maxillary arches based on Y = 15.746 + 0.602 × sum of mandibular incisors and mandibular first permanent molar widths (sum of mandibular incisors [SMI] + molars), Y = 18.224 + 0.540 × (SMI + molars), and Y = 16.186 + 0.586 × (SMI + molars) for both genders, and to estimate mandibular arches the parameters used were Y = 16.391 + 0.564 × (SMI + molars), Y = 14.444 + 0.609 × (SMI + molars), and Y = 19.915 + 0.481 × (SMI + molars). CONCLUSIONS: These formulas will be helpful for orthodontic diagnosis and clinical treatment planning during the mixed dentition stage.

Ajuste por género del análisis de dentición de Moyers para la población de Nayarit / Gender-adjustment of Moyers dentition analysis for the Nayarit (Mexico) population

Uno de los elementos diagnósticos de las maloclusiones en edades tempranas son las tablas de percentiles de Moyers, éstas predicen el tamaño de caninos y premolares que aún no erupcionan. Material y métodos: La muestra fue de 180 modelos de estudio pretratamiento de ortodoncia de sexo masculino que cumplían los criterios de inclusión y 319 de sexo femenino, por lo que se seleccionaron de forma aleatoria 180 modelos de estudio pretratamiento de sexo femenino para igualar las muestras. Se calculó la estadística descriptiva, los percentiles 75 y 50 para cada sexo y se utilizó la prueba de t de Student para comparar los resultados de las tablas con los ajustes de los percentiles 75 y 50 de cada sexo con el resultado de las tablas de Moyers y con los valores de los modelos de estudio. Resultado: Se encontraron diferencias estadísticas entre los resultados de las tablas de Moyers y las realizadas para la población de Nayarit. El percentil 75 de las tablas de Nayarit sobrestima el valor de caninos y premolares en ambos sexos, con el percentil 50 no se encontraron diferencias estadísticas. Conclusiones: Se recomienda utilizar el percentil 50 del ajuste realizado para predecir el tamaño de caninos y premolares.

Moyers percentile tables are one of the diagnostic elements used for early age malocclusions. These tables predict the size of non erupted canines and premolars. Material and methods: The sample was composed of 180 male patients study models and 319 female patients study models used for orthodontic pre-treatment. Models met inclusion criteria. So as to match samples, 180 female study models were randomly selected. Descriptive statistics were calculated, percentiles 75 and 50 for each gender, t Student test was used to compare results of tables with adjustment of percentiles 75 and 50 for each gender with Moyers tables results and values of the study models. Result: Statistically significant differences were found when comparing Moyers' tables results with those of the Nayarit population. Percentile 75 of Nayarit tables over-estimated values of canines and premolars in both genders. No statistical differences were found with 50 percentile. Conclusions: It is recommended to use the 50 percentile of the conducted adjustment in order to predict size of canines and premolars.

Aplicabilidad de la Predicción de Moyers 75% en pacientes Mapuche-Hulliche, Chile / Applicability of the Moyers prediction tables at 75% on Mapuche-Huilliche patients, Chile

Objetivo: determinar aplicabilidad del método Moyers 75% en población mapuche huilliche, Chile. Material y metodos: estudio descriptivo observacional se evaluó la predicción de Moyers nivel 75% en una población Mapuche Huilliche entre los 11 y 17 años de edad (25 hombres y 25 mujeres). Se determinó la suma de incisivos inferiores y la sumatoria de caninos y premolares de cada hemiarcada comparando con los valores predictivos. Resultados: Mayor número de casos en el rango 23.5 mm a 25.2 mm en la suma de incisivos inferiores, 60% de la muestra. La suma entre caninos y premolares presentó un promedio en el maxilar de 23.7 mm en hombres y 23.1 mm en mujeres y en la mandíbula un promedio de 22.9 mm en hombres y 22.1 mm en mujeres. Se encontró una discrepancia negativa de 60% en hombres y de un 40% en mujeres. En mujeres la discrepancia positiva superó a las negativas con porcentajes de 88% y 8%, significativamente. Conclusión:El método Moyers 75% es aplicable en hombres para ambos maxilares y parcialmente en mujeres huilliches.

Objective. To determine the applicability of the Moyers prediction tables at 75% on patients from the Mapuche-Huilliche population, Chile. Materials and Methods. A descriptive, observational study which evaluated the Moyers prediction tables at 75% in a Mapuche-Huilliche population aged between 11 and 17(25 men and 25 women). The sum of the lower incisors, and the sum of the canines and premolars of each quadrant was compared with each of the predictive values. Results. Increased number of cases in the range from 23.5 mm to 25.2 mm in the sum of lower incisors, which represent 60% of the sample. The sum of canines and premolars showed in maxilla a mean of 23.7 mm in men and 23.1 mm in women, and in mandiblea mean of 22.9 mm in men and 22.1 mm in women. A negative discrepancy of 60% was found in men and of 40% in women. For women, the positive discrepancysignificantly exceeded the negative discrepancies with percentages of 88% and 8%. Conclusions. The Moyers method at 75% was applicable in maxilla and mandible on Huilliche men, and partially applicable on women of the same ethnic group.