The accuracy comparison of 3D‐printed post and core using castable resin and castable wax resin

Abstract

The purpose of this research was to compare the accuracy of threedimensionally (3D) printed post and core fabricated with two different materials: reinforced wax and castable resin. Materials and methods:Fifteen extracted single root central incisors were selected. Root canal treatment and tooth preparation for crown were performed on all teeth. Eleven millimeters post space was created with standardized prefabricated fiber post drill. Polyvinylsiloxane impression material was used for root canal impressions. Each impression was then 3D scanned using an extraoral scanner and cast posts and cores were designed using 3Shape software. The digitally designed post and cores were 3D printed with two different materials: castable wax resin and castable resin. The castable resin patterns were scanned before and after complete polymerization. The wax patterns were also scanned. Digital volumetric measurement using Geomagic® Control X™ software was performed to determine accuracy. Results: The printed post and core had reduced volume (16.09 ± 3.839 mm 3 ) compared to the digital design (17.828 ± 3.904, p < 0.05). Before complete polymerization, the accuracy of 3D printed resin pattern (16.464 ± 3.017) was found to be superior to post and core printed with wax (16.193 ± 3.018, p < 0.05). However, no volume difference was found between completely polymerized resin (16.09 ± 3.839) and wax (16.044 ± 3.834, p = 1). Conclusion: 3D printed post and core showed significant volume shrinkage from the digital files used to create them. However, different materials had no effect on the accuracy of 3D printed post and core. K E Y W O R D S3D printing, accuracy of post and core, customized post and core, post and core 540

Clinical Applications of 3D-Printed Polymers in Dentistry: A Scoping Review

“…The same authors also compared the accuracy of reinforced printed wax and castable resin and found that both showed a volume reduction from the original file. 68 Three in vitro studies compared the accuracy of 3D-printed composite resin fixed single prostheses, such as crowns or inlays, to milled ones. Two studies showed superior overall fit and marginal fit for DLP 3D-printed crowns 69 and inlays, 70 respectively.…”

Enhancing Bond Strength of 3D-Printed Resin Posts Using Various Surface Pretreatments: An In Vitro Study

“…restoration boundaries, often leading to inadequate tooth structure reinforcement. 8 Furthermore, prefabricated fiber posts present clinical limitations, including bonding failures and adaptation challenges, 9 especially in elliptical root canals. 10 The gap between the dentin and these posts can result in an uneven resin cement layer, causing increased polymerization shrinkage, stress, and eventual post failure.…”

“…10 The gap between the dentin and these posts can result in an uneven resin cement layer, causing increased polymerization shrinkage, stress, and eventual post failure. 6,9,10 The dearth of comprehensive data pertaining to the optimal material and dimensions for post cores has prompted scholarly investigation into novel materials within this domain. According to existing literature, custom-cast posts and cores have been found to exhibit enhanced adaptation in comparison to prefabricated posts.…”

The impact of print orientation on the fracture resistance and failure patterns of additively manufactured cobalt‐chromium post and cores

“…6 Using new technologies and materials to fabricate customized post and core has been evaluated in the literature. [7][8][9][10][11][12][13][14] Computer-aided design and computer-aided manufacturing (CAD-CAM) subtractive and additive manufacturing (AM) can be used to manufacture custom post and cores. 15 Subtractive methods cause waste of raw materials and require sustainability and precision of milling tools.…”

“…Using new technologies and materials to fabricate customized post and core has been evaluated in the literature 7‐14 . Computer‐aided design and computer‐aided manufacturing (CAD‐CAM) subtractive and additive manufacturing (AM) can be used to manufacture custom post and cores 15 .…”