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Abstract
An implant template with great precision is significantly critical for clinical application. Currently, the application of an immediate implant remains limited by the deviations between the planned and actual achieved positions and long periods required for preparation of implant templates. Material Extrusion (MEX), as one kind of 3D printing method, is well known for its low cost and easy operation. However, the accuracy of the implant template printed by MEX has not been fully researched. To investigate the accuracy and feasibility of in vitro computer-guided surgery assisted with a MEX printed template, unidentified plaster samples missing a maxillary molar are digitalized. Mimics software (Materialise, Leuven, Belgium) is used for preoperative design. Surgical templates are fabricated by a MEX 3D printer (Lingtong III, Beijing SHINO, Beijing, China). Postoperative CBCT data are obtained after surgical template placement. The differences in positions of X, Y, Z, and dXYZ as well as angulations between the placed and the designed template are measured on labiolingual and mesiodistal planes. The deviations of the planned and the actual outcome in each dimension are observed and analyzed. Data from different samples indicate that the mean deviation of the angle measures approximately 3.640°. For position deviation, the maximum deviation is found in the z-direction and the mean deviation is about 0.365 ± 0.136 mm. The mean deviation of space Euclidean distance dXYZ is approximately 0.537 ± 0.123 mm. Implant templates fabricated by MEX present a relatively high accuracy for tooth-supported guide implantation.
Highlights
The application of digital technology in the field of dental implantation shows the oral medicine industry has entered a new digital era [1]
The combination of 3D printing for model fabrication and cone-beam computed tomography (CBCT) for data acquisition has rendered it more accurate and convenient for dentists to achieve the objective of immediate implantation
A cone-beam computed tomography (CBCT, Newtom VGI) data set of casts from 20 unidentified samples is used as base models
Summary
The application of digital technology in the field of dental implantation shows the oral medicine industry has entered a new digital era [1]. Additive manufacturing or three-dimensional printing (3DP) with the use of stereolithographic technology is widely implemented. The emergence of cone-beam computed tomography (CBCT) has solved the shortcomings of apical and curved tomography and is suitable for preimplantation planning of dental implants [7]. CBCT data can be used to evaluate the accuracy of 3D printed templates [2]. By comparing the postoperative CBCT scan information with the preoperative planning model, the position and angle deviations can be measured and the accuracy of the implant template can be evaluated [8,9]. The combination of 3D printing for model fabrication and CBCT for data acquisition has rendered it more accurate and convenient for dentists to achieve the objective of immediate implantation
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