Accuracy Improvement of Intraoral Scanning and Buccal Bite Registration Using Healing Abutment as Landmarks: An In Vitro Study

Abstract

This study aimed to determine the influence of the healing abutment (HA), placed at the implant placement site, on the accuracy of intraoral scanning and buccal bite registration in quadrant maxillary and mandibular models when using three types of intraoral scanner (IOS) and elucidate the distribution of arch distortion. Six experimental groups based on whether the HA was connected and the location of missing teeth were digitized using one laboratory scanner (Identica T500) and three IOSs (Trios 3, CS3600, and i500). Three-way ANOVA was used to analyze the effects of the scanner, location and number of missing teeth, and HA using Tukey investigation analyses for multiple comparisons (α = 0.05). Linear distances between hemispheres from the upper and lower arches were analyzed using the Jonckheere–Terpstra trend test to investigate the tendency of distortion from anterior to posterior tooth positions (α = 0.05). The accuracy of IOSs in groups with HAs was found significantly more accurate than groups without HAs. There was a significant trend in distortion from anterior to posterior tooth positions when using the Trios 3 and i500 IOSs. The scanning accuracy was affected by the presence of an HA, and the distortion along with the arch span may vary with the IOS utilized.

Auxiliary occlusal devices for IO scanning in a complete digital workflow of implant- supported crowns: A randomized controlled trial

“…However, when multiple teeth are missing, the accuracy of VIR may not meet clinical standard, rendering a complete digital work ow on multiple implants invalid. [1,20,21] Previous research [17] explored the use of healing abutments to improve interocclusal relationship accuracy in IOS on stone models, however no clinical study of a complete digital work ow on multiple implant-supported crowns was reported. Therefore, this study represents a signi cant contribution to the eld.…”

“…[13][14][15][16] This distinct geometry facilitates the stitching process and signi cantly improves the accuracy of digital impressions. Similarly, lack of geometry on an edentulous area also compromises the accuracy of VIRs, but this problem can be overcome by using auxiliary devices [17].…”

“…Jin et al [17] reported the use of healing abutments on the implants signi cantly improves the VIRs of partial edentulous area in laboratory setting. However, no clinical study was available to explore improving the accuracy of VIRs with the help of auxiliary devices and facilitate their use in restoring multiple implant-supported crowns using a digital work ow.…”

Auxiliary occlusal devices for IO scanning in a complete digital workflow of implant-supported crowns: a randomized controlled trial

“…This distinct geometry facilitates the stitching process and significantly improves the accuracy of digital impressions. Similarly, lack of geometry on an edentulous area also compromises the accuracy of VIRs, but this problem can be overcome by using auxiliary devices [17].…”

“…Jin et al [17] reported the use of healing abutments on the implants significantly improves the VIRs of partial edentulous area in laboratory setting. However, no clinical study was available to explore improving the accuracy of VIRs with the help of auxiliary devices and facilitate their use in restoring multiple implant-supported crowns using a digital workflow.…”