Influence of prolonged heating protocols on the physico-mechanical properties of resin composites.

IF 1.3 4区医学 Q3 DENTISTRY, ORAL SURGERY & MEDICINE

Quintessence international Pub Date : 2025-04-16 DOI:10.3290/j.qi.b6156608

Pedro Magão, Sharmila Samuel, Guilherme Moura, Georgia Mesquita, Karen McPherson, Sorin Teich, Fabio Rizzante

{"title":"Influence of prolonged heating protocols on the physico-mechanical properties of resin composites.","authors":"Pedro Magão, Sharmila Samuel, Guilherme Moura, Georgia Mesquita, Karen McPherson, Sorin Teich, Fabio Rizzante","doi":"10.3290/j.qi.b6156608","DOIUrl":null,"url":null,"abstract":"Objectives: This study aimed to evaluate the physical-mechanical behavior of resin composites when subjected to different prolonged heating protocols.Method and materials: A total of 150 specimens were divided into 15 groups (n = 10 per group) based on the restorative materials (Filtek Supreme, Viscalor, and Grandioso) and heating protocols: room temperature (22 °C), 24 hours at 68 °C, 7 days at 68 °C, 30- and 100- cycles of artificial aging by thermocycling (5 and 68 °C for 10 minutes each). The materials were inserted into a PVS matrix, cured for 20 seconds using a 1000 mW/cm² LED light-curing unit, stored for 24 hours in. The response variables measured were flexural strength and Knoop microhardness.Results: The flexural strength evaluation showed that Grandioso exhibited higher strength compared to Filtek Supreme and Viscalor, with no significant differences observed across the heating protocols. This indicates that prolonged heating did not affect the flexural strength of any of the tested resins. Knoop microhardness testing revealed significant differences among resins and heating protocols. Grandioso demonstrated the highest surface hardness across all protocols, while Filtek Supreme showed a decrease in hardness after 100 thermocycling cycles. Prolonged heating reduced surface hardness for Grandioso and Viscalor compared to room temperature, whereas Filtek Supreme maintained its hardness under extended heat exposure.Conclusion: These findings suggest that while flexural strength remains unaffected by heating, surface hardness varies depending on the resin type and the heating duration.","PeriodicalId":20831,"journal":{"name":"Quintessence international","volume":"0 0","pages":"0"},"PeriodicalIF":1.3000,"publicationDate":"2025-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Quintessence international","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.3290/j.qi.b6156608","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}

引用次数: 0

Abstract

Objectives: This study aimed to evaluate the physical-mechanical behavior of resin composites when subjected to different prolonged heating protocols.

Method and materials: A total of 150 specimens were divided into 15 groups (n = 10 per group) based on the restorative materials (Filtek Supreme, Viscalor, and Grandioso) and heating protocols: room temperature (22 °C), 24 hours at 68 °C, 7 days at 68 °C, 30- and 100- cycles of artificial aging by thermocycling (5 and 68 °C for 10 minutes each). The materials were inserted into a PVS matrix, cured for 20 seconds using a 1000 mW/cm² LED light-curing unit, stored for 24 hours in. The response variables measured were flexural strength and Knoop microhardness.

Results: The flexural strength evaluation showed that Grandioso exhibited higher strength compared to Filtek Supreme and Viscalor, with no significant differences observed across the heating protocols. This indicates that prolonged heating did not affect the flexural strength of any of the tested resins. Knoop microhardness testing revealed significant differences among resins and heating protocols. Grandioso demonstrated the highest surface hardness across all protocols, while Filtek Supreme showed a decrease in hardness after 100 thermocycling cycles. Prolonged heating reduced surface hardness for Grandioso and Viscalor compared to room temperature, whereas Filtek Supreme maintained its hardness under extended heat exposure.

Conclusion: These findings suggest that while flexural strength remains unaffected by heating, surface hardness varies depending on the resin type and the heating duration.

查看原文本刊更多论文

长时间加热对树脂复合材料物理力学性能的影响。

目的：本研究旨在评估树脂复合材料在不同长时间加热条件下的物理力学行为。方法和材料：根据修复材料（Filtek Supreme， Viscalor和Grandioso）和加热方案(室温（22°C）， 68°C 24小时，68°C 7天，通过热循环人工老化30和100次（5和68°C各10分钟），将150个标本分为15组（每组n = 10）。将材料插入到PVS基质中，使用1000 mW/cm²的LED光固化装置固化20秒，存储24小时。测量的响应变量为抗弯强度和努氏显微硬度。结果：弯曲强度评估显示，与Filtek Supreme和Viscalor相比，Grandioso具有更高的强度，在加热方案中没有观察到显着差异。这表明长时间加热不影响任何测试树脂的抗弯强度。Knoop显微硬度测试显示树脂和加热方案之间存在显著差异。Grandioso在所有方案中显示出最高的表面硬度，而Filtek Supreme在100次热循环后显示硬度下降。与室温相比，长时间加热会降低Grandioso和Viscalor的表面硬度，而Filtek Supreme在长时间加热下仍能保持硬度。结论：这些发现表明，虽然弯曲强度不受加热影响，但表面硬度取决于树脂类型和加热时间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Quintessence international 医学-牙科与口腔外科

CiteScore

3.30

自引率

5.30%

发文量

审稿时长

1 months

期刊介绍： QI has a new contemporary design but continues its time-honored tradition of serving the needs of the general practitioner with clinically relevant articles that are scientifically based. Dr Eli Eliav and his editorial board are dedicated to practitioners worldwide through the presentation of high-level research, useful clinical procedures, and educational short case reports and clinical notes. Rigorous but timely manuscript review is the first order of business in their quest to publish a high-quality selection of articles in the multiple specialties and disciplines that encompass dentistry.