Surface and bulk viscoelastic stability of solvent-stored bulk-fill resin-based composite.

IF 4.6 1区医学 Q1 DENTISTRY, ORAL SURGERY & MEDICINE Dental Materials Pub Date : 2024-10-21 DOI:10.1016/j.dental.2024.10.006

Halah Thanoon, Nikolaos Silikas, David C Watts

{"title":"Surface and bulk viscoelastic stability of solvent-stored bulk-fill resin-based composite.","authors":"Halah Thanoon, Nikolaos Silikas, David C Watts","doi":"10.1016/j.dental.2024.10.006","DOIUrl":null,"url":null,"abstract":"Objective: Investigate the effect of solvent-storage on surface hardness and bulk creep of fast photo-cured bulk-fill resin-based composite (RBC) compared to conventionally irradiated bulk-fill RBCs.Methods: Three bulk-fill RBCs were studied: Tetric® PowerFill (fast photo-cured bulk-fill RBC) (TPF), Tetric EvoCeram® (EVO), and GrandioSO® x-tra (GSOx) (conventional). Disk-shaped specimens of clinically realistic thickness (4 mm) were prepared from each material for: Group A: surface measurements (18 mm diameter) and Group B: 4 mm diameter for bulk compressive creep measurements. Group A disks were light-cured from the upper 'occlusal' surface for either 3 s or 20 s according to the manufacturer's recommendation. Martens hardness (HM) of both top and bottom surfaces of each specimen were measured. Group B: 4 × 4 mm cylindrical specimens were fully cured to measure bulk creep (CB). A 20 MPa static compressive stress was applied for 2 h, followed by 2 h of unloading. Strain deformation was recorded continuously for 4 h. Both Martens and bulk creep studies were performed under the following storage conditions at 37 °C: (i) dry at 24 h post curing (baseline), and (ii) after 7 and 30 d of storage in two different media: distilled water (DW) and 75 % ethanol/water (75 % E/W).Results: At baseline, HM for all materials ranged from 587 to 439 N/mm2 (top) and 398 to 342 N/mm2 (bottom). After 30 d of solvent-storage, more pronounced HM changes were observed, with the bottom surface being more affected. Normalised HM for TPF decreased by 44 % after 30 d in 75 % E/W. Maximum creep strain ranged from 1.1 % to 2.1 % at baseline, and after 30 d in 75 % E/W this increased from 1.9 % to 2.9 %. Depending on the material and storage condition, the percentage creep strain recovery after 30 d ranged between 65.2 % and 80 %. Increased filler loading in the bulk-fill RBCs decreased the creep strain magnitude and increased the surface hardness.Significance: Solvent storage decreased the Martens hardness of both upper and lower surfaces and increased the bulk creep characteristics of bulk-fill RBCs. Nevertheless, there was a similar relative stability in surface hardness and viscoelastic stability of fast-cured PowerFill compared to conventionally irradiated RBCs.","PeriodicalId":298,"journal":{"name":"Dental Materials","volume":" ","pages":""},"PeriodicalIF":4.6000,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Dental Materials","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.dental.2024.10.006","RegionNum":1,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}

引用次数: 0

Abstract

Objective: Investigate the effect of solvent-storage on surface hardness and bulk creep of fast photo-cured bulk-fill resin-based composite (RBC) compared to conventionally irradiated bulk-fill RBCs.

Methods: Three bulk-fill RBCs were studied: Tetric® PowerFill (fast photo-cured bulk-fill RBC) (TPF), Tetric EvoCeram® (EVO), and GrandioSO® x-tra (GSOx) (conventional). Disk-shaped specimens of clinically realistic thickness (4 mm) were prepared from each material for: Group A: surface measurements (18 mm diameter) and Group B: 4 mm diameter for bulk compressive creep measurements. Group A disks were light-cured from the upper 'occlusal' surface for either 3 s or 20 s according to the manufacturer's recommendation. Martens hardness (H_M) of both top and bottom surfaces of each specimen were measured. Group B: 4 × 4 mm cylindrical specimens were fully cured to measure bulk creep (C_B). A 20 MPa static compressive stress was applied for 2 h, followed by 2 h of unloading. Strain deformation was recorded continuously for 4 h. Both Martens and bulk creep studies were performed under the following storage conditions at 37 °C: (i) dry at 24 h post curing (baseline), and (ii) after 7 and 30 d of storage in two different media: distilled water (DW) and 75 % ethanol/water (75 % E/W).

Results: At baseline, H_M for all materials ranged from 587 to 439 N/mm² (top) and 398 to 342 N/mm² (bottom). After 30 d of solvent-storage, more pronounced H_M changes were observed, with the bottom surface being more affected. Normalised H_M for TPF decreased by 44 % after 30 d in 75 % E/W. Maximum creep strain ranged from 1.1 % to 2.1 % at baseline, and after 30 d in 75 % E/W this increased from 1.9 % to 2.9 %. Depending on the material and storage condition, the percentage creep strain recovery after 30 d ranged between 65.2 % and 80 %. Increased filler loading in the bulk-fill RBCs decreased the creep strain magnitude and increased the surface hardness.

Significance: Solvent storage decreased the Martens hardness of both upper and lower surfaces and increased the bulk creep characteristics of bulk-fill RBCs. Nevertheless, there was a similar relative stability in surface hardness and viscoelastic stability of fast-cured PowerFill compared to conventionally irradiated RBCs.

查看原文

微信好友朋友圈 QQ好友复制链接

本刊更多论文

溶剂储存的块状填充树脂基复合材料的表面和体积粘弹性稳定性。

目的：研究溶剂储存对快速光固化树脂基复合材料（RBC）表面硬度和体积蠕变的影响：与传统辐照散装填充树脂基复合材料（RBC）相比，研究溶剂储存对快速光固化散装填充树脂基复合材料（RBC）表面硬度和体积蠕变的影响：方法：研究了三种填充型 RBC：方法：研究了三种散装填充 RBC：Tetric® PowerFill（快速光固化散装填充 RBC）（TPF）、Tetric EvoCeram® (EVO) 和 GrandioSO® x-tra (GSOx)（传统）。每种材料都制备了符合临床实际厚度（4 毫米）的圆盘状试样，用于以下目的A 组：进行表面测量（直径 18 毫米）；B 组：进行体积压缩蠕变测量，直径 4 毫米。根据制造商的建议，A 组圆盘从上 "咬合 "面开始光固化 3 秒或 20 秒。测量每个试样上下表面的马氏体硬度 (HM)。B 组：4 × 4 毫米圆柱形试样完全固化后测量体积蠕变 (CB)。施加 20 兆帕的静态压应力 2 小时，然后卸载 2 小时。马氏体和体积蠕变研究都是在 37 °C 下的以下储存条件下进行的：(i) 固化后 24 小时的干燥状态（基线），以及 (ii) 在两种不同介质（蒸馏水 (DW) 和 75% 乙醇/水 (75% E/W)）中存放 7 天和 30 天后：基线时，所有材料的 HM 值介于 587 至 439 牛顿/平方毫米（上）和 398 至 342 牛顿/平方毫米（下）之间。溶剂储存 30 天后，观察到更明显的 HM 变化，底面受到的影响更大。在 75% E/W 条件下，30 天后 TPF 的归一化 HM 下降了 44%。基线最大蠕变应变从 1.1 % 到 2.1 % 不等，在 75 % E/W 中存放 30 天后，最大蠕变应变从 1.9 % 增加到 2.9 %。根据材料和储存条件的不同，30 天后蠕变应变恢复的百分比在 65.2 % 到 80 % 之间。散装填料 RBC 中填料含量的增加降低了蠕变应变的幅度，提高了表面硬度：溶剂储藏降低了上下表面的马顿硬度，增加了散装填充 RBC 的体积蠕变特性。然而，与传统辐照 RBC 相比，快速固化 PowerFill 的表面硬度和粘弹性稳定性具有相似的相对稳定性。

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分钟内获得全文去求助

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.