de Paula Lopez Vitor, Dias Corpa Tardelli Juliana, Botelho André Luis, Marcondes Agnelli José Augusto, Cândido Dos Reis Andréa
Undergraduate Student, Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil.
Postgraduate Student, Department of Dental Materials and Prosthesis, School of Dentistry of Ribeirão Preto, University of São Paulo (USP), Ribeirão Preto, SP, Brazil.
J Prosthet Dent. 2024 Dec;132(6):1262-1269. doi: 10.1016/j.prosdent.2022.12.006. Epub 2023 Jan 9.
Digital methods for manufacturing occlusal devices provide advantages over conventional techniques, but information about the mechanical properties of 3-dimensionally (3D) printed resins is scarce.
The purpose of this systematic review was to evaluate the literature to determine whether 3D-printed resins for occlusal devices present satisfactory mechanical performance when compared with milled and conventional heat polymerized and autopolymerized resins.
This systematic review followed the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) protocol and was registered in the Open Science Framework. The search strategy was applied without restriction of time and language to Embase, PubMed, Scopus, Science Direct, and Web of Science databases, and to the nonpeer-reviewed literature in ProQuest and Google Scholar. The selection process was conducted independently in 2 stages by 2 reviewers according to the eligibility criteria. The risk of bias was analyzed by using a checklist of important parameters to be considered. The systematic review considered the population, intervention, comparison, outcome, studies (PICOS) format, where population was resins for 3D printing of occlusal devices, intervention was inherent characteristics of the resin, comparison was conventional heat polymerized, autopolymerized, and milled resins, outcome was mechanical performance, and studies were in vitro experimental studies.
A total of 1430 articles were found with the search strategy. After removing 182 duplicates found in Rayyan, the title and abstract of 1248 articles were evaluated, of which 37 articles were screened from the databases, 23 were selected for full reading, and 6 met the eligibility criteria and were included in this review; 1 had a low risk of bias and 5 had a moderate risk. An additional search of the reference list of included articles did not result in the inclusion of any articles. A quantitative meta-analysis could not be performed because of the heterogeneity of the included studies regarding the type of resin used and the method for evaluating mechanical performance.
Resins for 3D printing had satisfactory mechanical performance for interocclusal devices when compared with conventional heat polymerized and autopolymerized resins, except for hardness. Milled resins were better than 3D-printed resins in hardness, wear resistance, flexural strength, flexural modulus, and fracture resistance when printing angle and thickness were not considered. Further development is needed in terms of printing techniques and chemical composition, as they are important for optimal mechanical properties and clinical performance.
与传统技术相比，制造咬合装置的数字方法具有优势，但关于三维（3D）打印树脂机械性能的信息却很少。
本系统评价的目的是评估文献，以确定与铣削、传统热聚合和自聚合树脂相比，用于咬合装置的3D打印树脂是否具有令人满意的机械性能。
本系统评价遵循系统评价和Meta分析的首选报告项目（PRISMA）方案指南，并在开放科学框架中进行了注册。检索策略不受时间和语言限制，应用于Embase、PubMed、Scopus、ScienceDirect和Web of Science数据库，以及ProQuest和谷歌学术搜索中的非同行评审文献。选择过程由两名评审员根据纳入标准分两个阶段独立进行。使用一份需考虑的重要参数清单分析偏倚风险。本系统评价采用人群、干预、对照、结局、研究（PICOS）格式，其中人群为用于3D打印咬合装置的树脂，干预为树脂的固有特性，对照为传统热聚合、自聚合和铣削树脂，结局为机械性能，研究为体外实验研究。
通过检索策略共找到1430篇文章。在去除Rayyan中发现的182篇重复文章后，对1248篇文章的标题和摘要进行了评估，其中从数据库中筛选出37篇文章，23篇文章被选作全文阅读，6篇文章符合纳入标准并被纳入本评价；1篇偏倚风险低，5篇偏倚风险中等。对纳入文章的参考文献列表进行额外检索未纳入任何文章。由于纳入研究在所用树脂类型和机械性能评估方法方面存在异质性，无法进行定量Meta分析。
与传统热聚合和自聚合树脂相比，用于3D打印的树脂在制作间咬合装置时具有令人满意的机械性能，但硬度除外。在不考虑打印角度和厚度时，铣削树脂在硬度、耐磨性、弯曲强度、弯曲模量和抗断裂性方面优于3D打印树脂。在打印技术和化学成分方面需要进一步发展，因为它们对优化机械性能和临床性能很重要。
