Accuracy and Reliability of Cone Beam Computed Tomographic Measurements of the Bone Labial and Palatal to the XXXX .

@entity1 @entity1347 @entity6121
PURPOSE: The aim of this study was to measure the thickness of bone labial and palatal to @entity1347 on @entity6121 ( @entity6121 ) images and to compare these measurements with direct clinical measurements to determine the reliability and accuracy of @entity6121 . MATERIALS AND METHODS: Eighteen healthy subjects were randomly selected from among candidates for immediate implant placement in the anterior maxilla. After extraction, labial bone thickness was measured at 1, 4, and 8 mm from the bone crest. Palatal bone thickness was also measured at 1 and 4 mm from the bone crest. The same measurements were performed on presurgical @entity6121 images. The @entity6121 measurements were compared to the direct measurements, and their accuracy and reliability were assessed by Pearson correlation coefficients and intraclass correlation coefficients, respectively. RESULTS: The mean width of labial bone was 0.50    0.32 mm and 0.76    0.37 mm for direct and @entity6121 measurements, respectively. Average thickness of the palatal bone was 1.16    0.53 mm and 1.41    0.51 mm for direct and @entity6121 measurements, respectively. The mean absolute error and mean relative error of @entity6121 measurements compared to direct measurements were 0.28    0.29 mm and 0.60    0.84 mm, respectively. The Pearson correlation between @entity6121 and direct measurements was 0.795 (P < .001) and the intraclass correlation coefficient between direct and @entity6121 measurements was 0.840. The correlation between the measurement series increased significantly when the measured bone was more than 1 mm thick. CONCLUSION: @entity6121 measurements of labial bone mostly overestimated bone thickness. @entity6121 has relatively good accuracy and reliability for measurement of labial bone thickness when the alveolar bone is thicker than 1 mm. However, most subjects have labial bone thinner than 1 mm; therefore, @entity6121 could result in large errors in many @entity1 .
