Date of Award

Fall 12-19-2022

Degree Type


Degree Name

MSOB (Master of Science in Oral Biology)

Primary Advisor

Evanthia Anadioti


Purpose: To compare the accuracy of the intra-oral scanner for different post space lengths 6, 8, and 10 mm and compare it with conventional impressions using three-dimensional software.

Materials and methods: A total of forty-five root typodont teeth (Maxillary central incisors) were selected. Root canal treatment and tooth preparation for the crown were performed on all teeth. Post space preparation of 6, 8, and 10 mm were created using prefabricated fiber post drill to standardize post space width and length. Root canal impressions were performed on all teeth using polyvinyl siloxane impression material. Each impression was then three-dimensionally scanned using an extraoral lab scanner to be used as a control. A direct scan was obtained using the chair-side scanner for each group. The file was exported to perform digital volume measurement using Geomagic control software to determine accuracy.

Results:Mean overall post-length accuracy was 75, 95, and 144 mm for groups 6, 8, and 10 mm post-depth, respectively. The accuracy of the digital intra-oral scanner compared to PVS impression groups was statistically not significant in the coronal, middle, and apical third (P= >0.05) except in the apical third for the 10 mm post depth (P=

Conclusion: Direct chairside scanning for post space has the same comparable accuracy as those using the gold standard direct conventional impression technique.

Available for download on Wednesday, December 20, 2023