Accuracy of 3D Printed Implant-Supported Provisional Restorations Fabricated Prior to Fully Guided Computer- Assisted Implant Insertion an in Vitro Study

Document Type : Original Article

Authors

1 Department of oral Implantology, Faculty of Dentistry, Cairo university

2 Removable Prosthodontics Department, Faculty of Dentistry, Cairo University, Cairo, Egypt

3 Fixed prosthodontics,faculty of dentistry,Cairo university,Cairo,Egypt

Abstract

Abstract
Aim of the study: This study aimed to evaluate the accuracy of vertical and proximal contacts in provisional 3D-printed, implant-supported restorations, following a complete digital workflow, once they were attached to implants.
Methods: In this study, a fully dentate maxillary model was modified twice to simulate partially edentulous arches, creating two reference models (R1 & R2). The first model had the right central incisor, and first molar removed (master model S), while the second had the left first and second premolars and first molar removed (master model F). These modified models were scanned, virtually designed, and 3D printed five times each. Cone-beam computed tomography and BlueSkyBio software were used for implant planning, surgical guide design, and provisional restoration creation. Dummy implants were inserted into the printed models using the surgical guides, and temporary restorations were attached. The models were then scanned and superimposed with the preplanned designs to measure vertical and proximal errors using MEDIT LINK and EXOCAD software, respectively.
Results: The study revealed a statistically significant vertical error between the preplanned and actual 3D-printed provisional restorations for the upper central incisor and fixed partial denture (FPD) (P= 0.035). In terms of proximal contact errors, the first molar restorations had the lowest frequency of errors compared to the upper central incisor and FPD.
Conclusions: The study found that most prostheses had vertical and proximal contact errors. Therefore, clinicians using a complete digital workflow should anticipate the need for adjustments to the prosthesis after implant insertion.

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