Strength and Adaptation of Stereolithography-Fabricated Zirconia Dental Crowns: An In Vitro Study

Abstract

C ompared to metal and resin, ceramic is the preferred material for fabricating dental restorations, owing to its chemical stability, biocompatibility, and toothlike color. 1,2 In the past decades, the advent and development of subtractive computer-aided design/computer-assisted manufacturing (CAD/CAM) technology have enabled all-ceramic restorations to be reliable, with accurate dimensions and reduced manufacturing time. 2,3 Toughened by phase transformation, yttria-stabilized zirconia ceramic is gaining popularity in clinical practice and has become the first choice for posterior dental restorations. However, the subtractive method requires milling tools, and the costs of the final machining process account for 70% to 80% of the total cost. 4 Besides, introduction of invisible microscopic cracks from the milling process could undermine the strength of the restoration, 5 resulting in a concentration of stress that could potentially lead to clinical failure. To overcome these issues, recent research has explored the feasibility of additive manufacturing of zirconia in

Additive Manufacturing of Zirconia Ceramic and Its Application in Clinical Dentistry: A Review

“…Li et al [ 86 ] assessed the physical and mechanical properties of stereolithography (SLA) additively manufactured zirconia crowns, as well as the internal and marginal adaptation of zirconia ceramic dental crowns. The strength of the SLA-manufactured zirconia crowns in this investigation was sufficient to build dental crowns, flexural strength of 812 ± 128 MPa and a Weibull modulus of 7.44.…”

Can polylactic acid be a CAD/CAM material for provisional crown restorations in terms of fit and fracture strength?

“…This controversy can be due to the production method of the provisional crowns as the authors benefit from 3D printing for the production, however, PLA provisional crowns of the present study were produced by CAD/CAM subtractive technology which was demonstrated to be a superior technique in the providence of provisional crowns. Although 3D printing, which is one of the additive manufacturing methods to produce dental restorations, is applied, there are controversial results about the adaptation of the restorations obtained with this method 29,30) . Therefore, one of the reasons for explaining the difference between these two studies may be the 'the choice of production method'.…”

Applications of three-dimensional printers in prosthetic dentistry

“…Studies on the accuracy of prostheses produced by 3D printers are shown in (Table 2). A zirconia crown manufactured by a 3D printer was reported and its accuracy was verified [38,39]. In one of the above studies, 3D-printed zirconia crowns were evaluated for their internal and marginal adaptation [39].…”

“…A zirconia crown manufactured by a 3D printer was reported and its accuracy was verified [38,39]. In one of the above studies, 3D-printed zirconia crowns were evaluated for their internal and marginal adaptation [39]. The authors found that internal and marginal adaptation is not yet satisfactory for clinical application.…”

“…Li R, 2019, [39] Zirconia crown Stereolithography The measured cement space of 3D printed zirconia crown Internal and marginal adaptation of stereolithography-manufactured zirconia was not yet suitable for clinical application.…”