CORELATION BETWEEN MEASURED & CALCULATED VALUES OF SNM ANGLE & MMA
Keywords:
Vertical Skeletal Dysplasia, Mandibular Plane Angle, Maxillo-mandibular Plane AngleAbstract
Introduction: Assessment of vertical jaw relationship is pivotal in orthodontic diagnosis and treatment planning. This study was aimed at finding whether significant difference exist between measured value of <SNM & calculated values of <SNM (<SNMc1 & <SNMc2) and measured value of MMA & calculated value of MMA and the difference if any has any impact on overall diagnosis or not.
Materials and Methods: Lateral Cephalograms of 60 subjects (30 females & 30 males) with mean age 18.43+4.21were taken and analyzed by measuring <SNM, <SNP, <SNO, MMA, <UOcc & LOcc Calculated <SNM I.e. <SNMc1=<SNP+MMA, <SNMc2 =<SNOcc+<LOcc and calculated MMA=<UOcc+<LOcc were then determined. Descriptive statistics for each variable was calculated and co-efficient of correlation (r) was calculated among the variables used.
Results: 1. Statistically significant and highly correlated relationship was found between the <SNM (measured) and <SNMc1 & <SNMc2, 2. Statistically significant and highly correlated relationship was found between the MMA (measured) and MMAc & 3 Statistically significant and highly correlated relationship was found between the MMA and <UOcc & <LOcc
Conclusion: No difference exists between the measured & calculated values of <SNM & MMA and thus statistically insignificant difference have no impact on quality of diagnosis.
