The Study On Reliability Of Mesio-distal Angulation And Bucco-lingual Inclination Measured With Three Methods

Objective: The purpose of this study was to evaluate the reliability of mesio-distalangulations (tip) and bucco-lingual inclinations (torque) measurement for all the teethby utilizing Invivo5.1,Dental Orthodontic software and Andrews model measurementrespectively.Method: A plaster study cast of the dentition of a volunteer with near-normalocclusion was obtained from impressions taken with silastic. The CBCT scan of thevolunteer placed in a standard position was taken using a NewTom VGi. Mesio-distalangulations (tip) and bucco-lingual inclinations (torque) for each tooth of thevolunteer were measured by Invivo5.1(text3),Dental Orthodontic (text2),Andrewsmodel measurement (text1) and compared. The measurements of all parameter weremeasured by the same investigators at15different times. All data were entered intoMicrosoft Excel worksheet and were analyzed using Excel and Statistical Package forSocial Sciences (SPSS) version16.0.Results:1. The ICC for the tip of text1,text2and text3were0.982,0.985and0.997;the ICCfor the torque of text1,text2and text3were0.998,0.995and0.999.The ICC indicateThe measurements of test3are more reliable than test1and test2.2. The variation for the tip and the torque was larger in the posterior than in theanterior in the test1,2and3.3. The variation for the tip was larger than the torque in the test1,2and3.4.There is no statistically significant difference in the test1and test2tip and torquemeasurements.5.There is a statistically significant difference in the test3and test2tip and torque measurements for all teeth.Conclusion:1. Invivo5.13D measurement,Andrews model measurement and DentalOrthodontic software measurement were reliable,the reliability of Invivo5.13Dmeasurement is better than Dental Orthodontic software and Andrews modelmeasurement.2. There is a significant difference between Dental Orthodontic softwaremeasurement and Invivo5.13D measurement.This indicates there is differencebetween the axis of tooth and crown.