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AIM: To identify the most reliable method for age estimation among three variables, that is, condylar height, length of mandibular body and third molar calcification by Demirjian's method. MATERIALS AND METHODS: Orthopantomograms and lateral cephalograms of 60 patients with equal gender ratio were included in the study, among each gender 15 subjects were below 18 years and 15 subjects were above 18 years. Lateral cephalograms were traced, height of condyle and mandibular body are measured manually on the tracing paper, OPG's were observed on radiographic illuminator and maturity score of third molar calcification was noted according to Demirjian's method. All the measurements were subjected to statistical analysis. RESULTS: The results obtained are of no significant difference between estimated age and actual age with all three parameters (P > 0.9780 condylar height, P > 0.9515 length of mandibular body, P > 0.8611 third molar calcification). Among these three, length of mandibular body shows least standard error test (i.e. 0.188). CONCLUSION: Although all three parameters can be used for age estimation, length of mandibular body is more reliable followed by height of condyle and third molar calcification.
RESUMO
BACKGROUND: To determine the association between the thickness of masseter muscle and the maxillary dental arch width. To explore the influence of gender on masseter muscle thickness. MATERIALS & METHODS: Seventy subjects (35 females and 35 males) of age 18 to 25 years were selected for the study based on class I molar relationship. The masseter muscle thickness of the right and left sides in every subject were found out through ultrasound scanning of the muscle, in both relaxed and clenched states. The maxillary dental arch width was measured on the study model with an electronic caliper. Student t test, Pearson's Correlation Coefficient was performed to assess the sample. RESULTS: Masseter Muscle Thickness showed a positive correlation with Maxillary Dental Arch Width r ≤0.74. The masseter muscle thickness is greater in male subjects in both relaxed (0.001
RESUMO
OBJECTIVE: To compare the accuracy of linear measurements on lateral and frontal cephalograms with gold standard skull measurements. MATERIALS AND METHODS: Based on the specific criteria including reliable occlusion and condyles fitting in glenoid fossa, 15 dry human skulls were selected from a larger collection. Lateral and frontal cephalograms were taken of each skull by standardized methods. Steel ball bearings were used to identify the anatomic landmarks. Linear measurements in midsagittal plane were made on all three records. Intraclass correlation coefficients, Pearson's correlation coefficient and regression constant were calculated to assess the records simultaneously. RESULTS: The frontal cephalometric measurements showed high correlation to the direct skull measurements (Pearson's coefficient 0.943