Conventionally and digitally fabricated removable complete dentures: manufacturing accuracy, fracture resistance and repairability

IF 4.6 1区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE

Dental Materials Pub Date : 2024-07-30 DOI:10.1016/j.dental.2024.07.022

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引用次数: 0

Abstract

Objectives

Conventionally and digitally manufactured removable complete dentures with different dentition forms were examined for manufacturing accuracy (trueness, precision), fracture forces under torsional loading and subsequent repairability.

Methods

A total of 90 mandibular prostheses were manufactured. Ten were made using the injection molding technique and finished with prefabricated teeth. 40 bases each, were manufactured subtractively and additively. Digitally the prosthesis’ dental arch was divided either into two quadrants or three sextants, or kept as full arch. Afterwards, ten additive and subtractive bases were finished with prefabricated teeth and ten of each with milled quadrants, sextants and full arches. After manufacturing, all specimens were rescanned for accuracy comparisons using the Root Mean Square (RMS). Lastly, all specimens were tested to failure under torsional loading.

Results

Conventionally manufactured dentures showed the greatest deviation in accuracy. The type of base manufacturing did not determine the fracture resistance of the prostheses. The dentition form had a significant influence. While prefabricated teeth (86.01 ± 19.76 N) and quadrants (77.89 ± 9.58 N) showed a low fracture resistance, sextants (139.12 ± 21.41 N) and full arches (141.05 ± 17.14 N) achieved the highest fracture forces. Subtractive bases with prefabricated teeth or quadrants were assessed to be repairable, digital dentures with full arch were assessed as not repairable.

Significance

The presented testing set-up is suitable to determine the fracture behavior of dentures rather than of standards. With the possibility of digital design and individual manufacturing, dentures’ mechanical stability can be significantly increased, especially with suitable dentition forms.

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传统和数字制作的可摘全口义齿：制造精度、抗断裂性和可修复性。

目的方法：对传统义齿和数字化制造的不同牙列的可摘全口义齿的制造精度（真实度、精确度）、扭转载荷下的断裂力以及随后的可修复性进行研究：共制作了 90 个下颌义齿。方法：共制作了 90 个下颌义齿，其中 10 个采用注射成型技术制作，并用预制牙齿完成。用减法和加法各制作了 40 个基托。修复体的牙弓以数字方式分为两个象限或三个六分仪，或保留为全牙弓。然后，用预制牙齿完成 10 个加法和减法基底，用铣制的象限、六分和全牙弓完成各 10 个基底。制作完成后，对所有试样进行重新扫描，使用均方根（RMS）进行精度比较。最后，所有试样都在扭转载荷下进行了失效测试：结果：传统制造的假牙显示出最大的精度偏差。基托的制造类型并不决定义齿的抗折性。义齿的形式则有很大影响。预制牙（86.01 ± 19.76 N）和四联牙（77.89 ± 9.58 N）的抗折力较低，而六联牙（139.12 ± 21.41 N）和全牙弓（141.05 ± 17.14 N）的抗折力最高。带有预制牙或象限的基托被评估为可修复，带有全牙弓的数字义齿被评估为不可修复：意义：所介绍的测试装置适用于确定假牙的断裂行为，而非标准。随着数字化设计和个性化制造的实现，假牙的机械稳定性可以显著提高，尤其是在合适的牙列形态下。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Dental Materials 工程技术-材料科学：生物材料

CiteScore

9.80

自引率

10.00%

发文量

290

审稿时长

67 days

期刊介绍： Dental Materials publishes original research, review articles, and short communications. Academy of Dental Materials members click here to register for free access to Dental Materials online. The principal aim of Dental Materials is to promote rapid communication of scientific information between academia, industry, and the dental practitioner. Original Manuscripts on clinical and laboratory research of basic and applied character which focus on the properties or performance of dental materials or the reaction of host tissues to materials are given priority publication. Other acceptable topics include application technology in clinical dentistry and dental laboratory technology. Comprehensive reviews and editorial commentaries on pertinent subjects will be considered.