Analysis of Topography, Flexural Strength, and Microstructure of a Lithium Disilicate Glass- Ceramic after Surface Finishing.

IF 2.1 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE

International Journal of Prosthodontics Pub Date : 2024-08-23 DOI:10.11607/ijp.8352

Giordana Picolo Furini, Oscar E Pecho, Pedro Álvarez-Lloret, Paula Benetti

{"title":"Analysis of Topography, Flexural Strength, and Microstructure of a Lithium Disilicate Glass- Ceramic after Surface Finishing.","authors":"Giordana Picolo Furini, Oscar E Pecho, Pedro Álvarez-Lloret, Paula Benetti","doi":"10.11607/ijp.8352","DOIUrl":null,"url":null,"abstract":"Purpose: To investigate the influence of finishing, polishing, and glazing on the roughness, flexural strength, and microstructure of lithium disilicate glass-ceramics.Materials and methods: LD CAD/CAM blocks were cut into 96 discs (1.2 × 12 mm). After crystallization, a layer of glaze was applied to the discs' surfaces. The specimens were randomly divided into eight groupsn = 12) for different surface treatments (glaze [G], diamond abrasion [D], find diamond abrasion [F], and polishing [P]): G(glaze, control), GD, GDG, GDP, GF GFG, GFP, and GDFP. Mean roughness (Ra), mean square height (Rq), and maximum roughness (Rz) were measured. The biaxial flexural strength test was performed in a universal testing machine at 0.5 mm/minute. Microstructural analysis was performed using x-ray diffraction patterns (XRD). Differences on the roughness obtained in distinct groups was analyzed with Kruskal-Wallis and Bonferroni tests (α = .05). The flexural strength tests were compared with one-way ANOVA.Results: Glazed groups (G, GDG, and GFG) presented the lowest surface roughness, lower crystallinity, and higher flexural strength than the other groups. Although polishing and glaze presented similar surface roughness, polishing protocol decreased the flexural strength compared to the control group G.Conclusions: Clinically adjusted LD glass-ceramic restorations should be reglazed whenever possible to improve strength.","PeriodicalId":50292,"journal":{"name":"International Journal of Prosthodontics","volume":" ","pages":"439-446"},"PeriodicalIF":2.1000,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Prosthodontics","FirstCategoryId":"3","ListUrlMain":"https://doi.org/10.11607/ijp.8352","RegionNum":4,"RegionCategory":"医学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"DENTISTRY, ORAL SURGERY & MEDICINE","Score":null,"Total":0}

引用次数: 0

Abstract

Purpose: To investigate the influence of finishing, polishing, and glazing on the roughness, flexural strength, and microstructure of lithium disilicate glass-ceramics.

Materials and methods: LD CAD/CAM blocks were cut into 96 discs (1.2 × 12 mm). After crystallization, a layer of glaze was applied to the discs' surfaces. The specimens were randomly divided into eight groupsn = 12) for different surface treatments (glaze [G], diamond abrasion [D], find diamond abrasion [F], and polishing [P]): G(glaze, control), GD, GDG, GDP, GF GFG, GFP, and GDFP. Mean roughness (Ra), mean square height (Rq), and maximum roughness (Rz) were measured. The biaxial flexural strength test was performed in a universal testing machine at 0.5 mm/minute. Microstructural analysis was performed using x-ray diffraction patterns (XRD). Differences on the roughness obtained in distinct groups was analyzed with Kruskal-Wallis and Bonferroni tests (α = .05). The flexural strength tests were compared with one-way ANOVA.

Results: Glazed groups (G, GDG, and GFG) presented the lowest surface roughness, lower crystallinity, and higher flexural strength than the other groups. Although polishing and glaze presented similar surface roughness, polishing protocol decreased the flexural strength compared to the control group G.

Conclusions: Clinically adjusted LD glass-ceramic restorations should be reglazed whenever possible to improve strength.

查看原文本刊更多论文

二硅酸锂玻璃陶瓷表面抛光后的形貌、抗弯强度和微观结构分析

目的：研究精加工、抛光和施釉对二硅酸锂玻璃陶瓷的粗糙度、抗弯强度和微观结构的影响：将 LD CAD/CAM 块切割成 96 个圆盘（1.2 × 12 毫米）。结晶后，在圆盘表面涂上一层釉。将试样随机分为八组n = 12），分别进行不同的表面处理（上釉[G]、金刚石研磨[D]、找金刚石研磨[F]和抛光[P]）：G（上釉，对照组）、GD、GDG、GDP、GF GFG、GFP 和 GDFP。测量了平均粗糙度（Ra）、均方高度（Rq）和最大粗糙度（Rz）。在万能试验机上以 0.5 毫米/分钟的速度进行了双轴抗弯强度测试。使用 X 射线衍射图样 (XRD) 进行了微观结构分析。通过 Kruskal-Wallis 和 Bonferroni 检验（α = .05）分析了不同组别粗糙度的差异。弯曲强度测试采用单因素方差分析进行比较：与其他组相比，上釉组（G、GDG 和 GFG）的表面粗糙度最低，结晶度较低，抗折强度较高。虽然抛光和上釉的表面粗糙度相似，但与对照组 G 相比，抛光方案降低了抗折强度：结论：临床调整的 LD 玻璃陶瓷修复体应尽可能重新上釉，以提高强度。

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

International Journal of Prosthodontics 医学-牙科与口腔外科

CiteScore

3.20

自引率

4.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Official Journal of the European Association for Osseointegration (EAO), the International College of Prosthodontists (ICP), the German Society of Prosthodontics and Dental Materials Science (DGPro), and the Italian Academy of Prosthetic Dentistry (AIOP) Prosthodontics demands a clinical research emphasis on patient- and dentist-mediated concerns in the management of oral rehabilitation needs. It is about making and implementing the best clinical decisions to enhance patients'' quality of life via applied biologic architecture - a role that far exceeds that of traditional prosthetic dentistry, with its emphasis on materials and techniques. The International Journal of Prosthodontics is dedicated to exploring and developing this conceptual shift in the role of today''s prosthodontist, clinician, and educator alike. The editorial board is composed of a distinguished team of leading international scholars.