Accuracy assessment of implant placement using a stereolithographic surgical guide made with digital scan / 대한치과보철학회지

PURPOSE: The objective of this study was to evaluate the accuracy of a stereolithographic surgical guide that was made with information from intraoral digital impressions and cone beam CT (CBCT). MATERIALS AND METHODS: Six sets of resin maxilla and mandible models with missing teeth were used in this study. Intraoral digital impressions were made. The virtual models provided by these intraoral digital impressions and by the CBCT scan images of the resin models were used to create a surgical guide. Implant surgery was performed on the resin models using the surgical guide. After implant placement, the models were subjected to another CBCT scan to compare the planned and actual implant positions. Deviations in position, depth and axis between the planned and actual positions were measured for each implant. RESULTS: The mean deviation of the insertion point and angulation were 0.28 mm and 0.26degrees, apex point were 0.11 mm and 0.14 mm respectively. The implants were situated at a mean of 0.44 mm coronal to the planned vertical position. CONCLUSION: This study demonstrates that stereolithographic surgical guides created without the use of impressions and stone models show promising accuracy in implant placement.

Transfer and Storage of Craniofacial Digital Data to Personal Computer

Current diagnosis and surgical correction of craniofacial surgery would benefit from accurate and standardized data of computed tomography (CT). The ability of CT to identify bony and soft tissue features makes it particulrary useful for the management of craniofacial skeletal anomalies. Development of computer technology make it easy to store the large volume data of medical digital data and to manipulate the data at the office of surgeon. Digital data produced by modern modalities has its own advantages compare with conventional film datas; Accuracy, permanent storage, reproducibility. and etc. So the storage and archiving of the digital data of craniofacial field would have the utmost significance for the futher development of the craniofacial surgery. The raw data of thirty craniofacial CT data were transferred from a CT system to a personal computer via Ethernet TCP/IP connection. The transmission of DICOM data to the personal computer was successful and the transmitted images and their header information were displayed by DICOM viewing programs. This method of transfer and storage of digital data was useful for managing digital images and convenient for physicians in the hospital without PACS.