Raw data for "The Impact of Drilling Guide Length of a Surgical Guide on Accuracy of Pre-Drilling for Miniscrew Insertion"

Background: temporary anchorage devices (TADs) are broadly used in orthodontic treatment. TADs must be placed accurately to avoid collision against tooth roots. To place miniscrews with higher accuracy, digitally designed surgical guide was proposed in previous studies. However, to our knowledge, there were no article that assessed minimal required length to achieve good drilling accuracy. The objective of the present study was to evaluate accuracy of pre-drilling using computer aided designed surgical guide with different length. Methods: a typodont model was scanned and surgical guides of 3.0, 4.5, 6.0 mm was designed. Duplicated typodonts and the surgical guides were printed with a 3D printer. Using these models and surgical guides, pre-drillings were done. Free-hand drilling was also done for the control. The drilled models were scanned with micro computed tomography to evaluate the accuracy. Results: The mean error at the tip of the drill were 0.44 mm, 0.61 mm, 0.41 mm and 0.24 mm for free-hand and surgical guide of 3.0, 4.5, and 6.0 mm, respectively. Conclusion: the results suggested that a longer surigical guide was recom-mended to achieve good insertion accuracy for a narrow interradicular space, and 3.0 mm was enough when an error of 1.0 mm was acceptable for the insertion site.