Effect of exposure energy dose on lateral resolution and flexural strength of three-dimensionally printed dental zirconia.

IF 2.7 3区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of Advanced Prosthodontics Pub Date : 2023-10-01 Epub Date: 2023-10-26 DOI:10.4047/jap.2023.15.5.248

Kyle Radomski, Yun-Hee Lee, Sang J Lee, Hyung-In Yoon

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Abstract

Purpose: This study aims to evaluate the effects of exposure energy on the lateral resolution and mechanical strength of dental zirconia manufactured using digital light processing (DLP).

Materials and methods: A zirconia suspension and a custom top-down DLP printer were used for in-office manufacturing. The viscosity of the suspension and uniformity of the exposed light intensity were controlled. Based on the exposure energy dose delivered to each layer, the specimens were classified into three groups: low-energy (LE), medium-energy (ME), and high-energy (HE). For each energy group, a simplified molar cube was used to measure the widths of the outline (X_o and Y_o) and isthmus (X_i and Y_i), and a bar-shaped specimen of the sintered body was tested. A Kruskal-Wallis test for the lateral resolution and one-way analysis of variance for the mechanical strength were performed (α = .05).

Results: The zirconia green bodies of the ME group showed better lateral resolution than those of the LE and HE groups (both P < .001). Regarding the flexural strength of the sintered bodies, the ME group had the highest mean value, whereas the LE group had the lowest mean value (both P < .05). The ME group exhibited fewer agglomerates than the LE group, with no distinctive interlayer pores or surface defects.

Conclusion: Based on these findings, the lateral resolution of the green body and flexural strength of the sintered body of dental zirconia could be affected by the exposure energy dose during DLP. The exposure energy should be optimized when fabricating DLP-based dental zirconia.

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暴露能量剂量对三维打印牙科氧化锆的横向分辨率和弯曲强度的影响。

目的：本研究旨在评估曝光能量对使用数字光处理（DLP）制造的牙科氧化锆的横向分辨率和机械强度的影响。材料和方法：氧化锆悬浮液和定制的自上而下的DLP打印机用于办公室制造。控制悬浮液的粘度和曝光光强度的均匀性。根据输送到每层的暴露能量剂量，将样本分为三组：低能量（LE）、中等能量（ME）和高能量（HE）。对于每个能量组，使用简化的摩尔立方体来测量轮廓（Xo和Yo）和地峡（Xi和Yi）的宽度，并测试烧结体的棒状样品。对横向分辨率进行了Kruskal-Wallis检验，并对机械强度进行了单向方差分析（α=.05）。结果：ME组的氧化锆坯体显示出比LE和HE组更好的横向分辨率（均P<.001）。关于烧结体的弯曲强度，ME组的平均值最高，而LE组的平均值最低（均P<0.05）。ME组的团聚体比LE组少，没有明显的层间孔隙或表面缺陷。结论：基于这些发现，牙科氧化锆烧结体的横向分辨率和弯曲强度可能受到DLP过程中暴露能量剂量的影响。在制造DLP基牙科氧化锆时，应优化曝光能量。

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来源期刊

Journal of Advanced Prosthodontics DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

4.70

自引率

3.80%

发文量

期刊介绍： This journal aims to convey scientific and clinical progress in the field of prosthodontics and its related areas to many dental communities concerned with esthetic and functional restorations, occlusion, implants, prostheses, and biomaterials related to prosthodontics. This journal publishes • Original research data of high scientific merit in the field of diagnosis, function, esthetics and stomatognathic physiology related to prosthodontic rehabilitation, physiology and mechanics of occlusion, mechanical and biologic aspects of prosthodontic materials including dental implants. • Review articles by experts on controversies and new developments in prosthodontics. • Case reports if they provide or document new fundamental knowledge.