Effect of build orientation on the wear resistance and hardness of denture teeth fabricated using digital light processing: An in vitro study.

IF 3.2 2区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Journal of prosthodontic research Pub Date : 2024-08-27 DOI:10.2186/jpr.JPR_D_24_00111

Khin Pyae Sone, Hidekazu Takahashi, Maiko Iwaki, Sahaprom Namano, Yuriko Komagamine, Shunsuke Minakuchi, Manabu Kanazawa

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Abstract

Purpose: This in vitro study investigated the effect of build orientation on the wear resistance and hardness of denture teeth fabricated using digital light processing (DLP) compared to other denture tooth materials.

Methods: Disc-shaped specimens were prepared using denture tooth monomers and DLP devices in three build orientations: 0°, 45°, and 90°. Specimens of the same shape were fabricated using denture tooth materials for subtractive manufacturing, commercially available polymethylmethacrylate (PMMA) resin, and composite resin. The wear resistance was evaluated as the wear volume loss after 50,000 wear cycles using a ball-on-disc wear device in water for two-body wear and poppy seed slurry for three-body wear. The Vickers hardness values of the materials were measured. Two-way and one-way analyses of variance were performed for wear resistance and hardness, respectively, followed by Tukey's honest significance test.

Results: The interaction between the denture tooth resins and maximum wear volume was significant (P < 0.01). The 0° build orientation exhibited the lowest wear volume in the three-body wear test and the highest hardness among the three build orientations. The 0° DLP-fabricated specimens demonstrated significantly less wear volume than that of the PMMA specimens and a wear volume comparable to that of the milled specimens. However, the 0° DLP-fabricated specimens showed significantly lower hardness than that of the milled and PMMA specimens. The composite resin specimens exhibited the highest wear resistance and hardness.

Conclusions: A 0° build orientation is recommended for DLP-fabricated denture teeth compared to 45° and 90° orientations to achieve greater wear resistance and hardness.

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构建方向对使用数字光处理技术制作的义齿的耐磨性和硬度的影响：体外研究

目的：与其他义齿材料相比，本体外研究调查了构建方向对使用数字光处理（DLP）制作的义齿的耐磨性和硬度的影响：方法：使用义齿单体和 DLP 设备制备圆盘状试样，并采用三种构建方向：0°、45° 和 90°：0°、45° 和 90°。使用用于减法制造的义齿材料、市售聚甲基丙烯酸甲酯（PMMA）树脂和复合树脂制作相同形状的试样。耐磨性的评估是在 50,000 次磨损循环后，使用盘上球磨损装置，在水中进行二体磨损，在罂粟籽泥浆中进行三体磨损。测量了材料的维氏硬度值。分别对耐磨性和硬度进行了双向和单向方差分析，然后进行了Tukey显著性检验：结果：义齿树脂与最大磨损量之间的交互作用显著（P < 0.01）。在三体磨损测试中，0°构建方向的磨损量最小，硬度在三种构建方向中最高。与 PMMA 试样相比，0° DLP 制成试样的磨损量明显较小，与研磨试样的磨损量相当。然而，0° DLP 制成的试样的硬度明显低于研磨试样和 PMMA 试样。复合树脂试样表现出最高的耐磨性和硬度：结论：与 45° 和 90° 方向相比，建议在 DLP 制造义齿时采用 0° 制造方向，以获得更高的耐磨性和硬度。

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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.