Load-bearing capacity of 3D-printed incisor partial-coverage crowns made from zirconia and composite

IF 3.2 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of prosthodontic research Pub Date : 2024-04-27 DOI:10.2186/jpr.jpr_d_23_00028

Rebecca Handermann, Nathalie Zehender, Stefan Rues, Hiro Kobayashi, Peter Rammelsberg, Franz Sebastian Schwindling

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引用次数: 0

Abstract

Purpose: This study investigated the fracture resistance of 0.5-mm-thick restorations for minimally invasive therapy. Anterior partial-coverage crowns composed of three-dimensional (3D)-printed 3-mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP; Lithacon 3Y210, Lithoz) and 3D-printed composite (Varseo Smile Crown plus, Bego) were compared with a control group made from milled 3Y-TZP (Cercon ht, DentsplySirona).

Methods: Three groups each with 27 restorations were produced. For milled 3Y-TZP partial-coverage crowns, drill compensation was needed so the milling bur could access the inner surface at the incisal edge. Restoration fit was verified by cross-sectioning 12 specimens in each group. The remaining 15 restorations were sandblasted (Al2O3, 0.1 MPa) and adhesively cemented (Panavia SA, Kuraray) onto CoCr teeth. Static load-to-failure tests were performed. The load was induced on the incisal edge. The forces needed to fracture the specimens were analyzed using the Welch analysis of variance and post hoc Dunnet-T3 tests. The Weibull parameters were also calculated.

Results: Drill compensation increased cement thickness at the loading area by 200 µm in milled 3Y-TZP restorations compared with the 3D-printed partial-coverage crowns. Fracture resistance was the highest in 3D-printed 3Y-TZP restorations (1570±661N) followed by milled 3Y-TZP (886±164N) and 3D-printed composite partial-coverage crowns (570±233 N). Milled 3Y-TZP was associated with a substantially higher Weibull modulus (m=6) than the 3D-printed materials (m=2), suggesting greater reliability.

Conclusions: Fracture resistance increased with tighter fit, demonstrating the benefit of the geometric freedom associated with 3D-printing. Future research should focus on making 3D-printed 3Y-TZP more reliable to increase its safety in clinical use.

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氧化锆和复合材料 3D 打印门牙部分覆盖冠的承重能力

目的：本研究调查了用于微创治疗的 0.5 毫米厚修复体的抗折性。将由三维（3D）打印的3-mol%钇稳定四方氧化锆多晶体（3Y-TZP；Lithacon 3Y210，Lithoz）和三维打印的复合材料（Varseo Smile Crown plus，Bego）组成的前牙部分覆盖冠与由研磨的3Y-TZP（Cercon ht，DentsplySirona）制成的对照组进行比较：方法：分为三组，每组 27 个修复体。对于铣制的 3Y-TZP 部分覆盖冠，需要进行钻孔补偿，这样铣刀才能进入切缘的内表面。通过对每组中的 12 个试样进行横截面检查来验证修复体的密合性。其余 15 个修复体经过喷砂处理（Al2O3，0.1 兆帕）并粘接在钴铬合金牙齿上（Panavia SA，Kuraray）。进行了静态加载-失效测试。载荷作用在切缘上。使用韦尔奇方差分析和事后 Dunnet-T3 检验分析了试样断裂所需的力。同时还计算了 Weibull 参数：结果：与三维打印的部分覆盖冠相比，研磨的3Y-TZP修复体的钻孔补偿使加载区域的骨水泥厚度增加了200微米。3D打印的3Y-TZP修复体的抗折力最高（1570±661N），其次是研磨的3Y-TZP（886±164N）和3D打印的复合材料部分覆盖冠（570±233N）。磨制的 3Y-TZP 的 Weibull 模量（m=6）远高于三维打印材料（m=2），这表明其可靠性更高：结论：抗断裂强度随着配合的紧密度增加而增加，这证明了三维打印的几何自由度带来的好处。未来的研究重点应是使三维打印的 3Y-TZP 更可靠，以提高其在临床使用中的安全性。

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来源期刊

Journal of prosthodontic research DENTISTRY, ORAL SURGERY & MEDICINE-

CiteScore

6.90

自引率

11.10%

发文量

161

期刊介绍： Journal of Prosthodontic Research is published 4 times annually, in January, April, July, and October, under supervision by the Editorial Board of Japan Prosthodontic Society, which selects all materials submitted for publication. Journal of Prosthodontic Research originated as an official journal of Japan Prosthodontic Society. It has recently developed a long-range plan to become the most prestigious Asian journal of dental research regarding all aspects of oral and occlusal rehabilitation, fixed/removable prosthodontics, oral implantology and applied oral biology and physiology. The Journal will cover all diagnostic and clinical management aspects necessary to reestablish subjective and objective harmonious oral aesthetics and function. The most-targeted topics: 1) Clinical Epidemiology and Prosthodontics 2) Fixed/Removable Prosthodontics 3) Oral Implantology 4) Prosthodontics-Related Biosciences (Regenerative Medicine, Bone Biology, Mechanobiology, Microbiology/Immunology) 5) Oral Physiology and Biomechanics (Masticating and Swallowing Function, Parafunction, e.g., bruxism) 6) Orofacial Pain and Temporomandibular Disorders (TMDs) 7) Adhesive Dentistry / Dental Materials / Aesthetic Dentistry 8) Maxillofacial Prosthodontics and Dysphagia Rehabilitation 9) Digital Dentistry Prosthodontic treatment may become necessary as a result of developmental or acquired disturbances in the orofacial region, of orofacial trauma, or of a variety of dental and oral diseases and orofacial pain conditions. Reviews, Original articles, technical procedure and case reports can be submitted. Letters to the Editor commenting on papers or any aspect of Journal of Prosthodontic Research are welcomed.