Bonding Performance and Interfacial Ultra-Morphology/Nanoleakage of a Modern Self-Curing Bulk-Fill Restorative System: An In Vitro Study.

Q1 Dentistry
Paula Maciel Pires, Aline Almeida Neves, Paul Farrar, Álvaro Ferrando Cascales, Avijit Banerjee, Victor Pinheiro Feitosa, Salvatore Sauro
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引用次数: 0

Abstract

Objectives:  The objective of this study was to evaluate the bonding performance and the interfacial ultramorphology of an innovative self-curing restorative system compared with a conventional light-curing resin composite applied on dentin in etch-and-rinse (ER) or self-etch (SE) mode.

Materials and methods:  Twenty cavities (class I) were prepared in sound dentin and restored using two materials: (1) CERAM (n = 10; CERAM.X ONE, Dentsply Sirona) in combination with a universal adhesive system (PBU [Prime & Bond Universal]), or (2) STELA (n = 10; Stela Automix, SDI) in combination with its adhesive primer. Half of the specimens from each group were bonded in ER or SE mode. Specimens underwent microtensile bond strength testing after 24 hours of storage in artificial saliva. Failure mode was determined using a stereomicroscope, and fractographic analysis was performed using scanning electron microscopy. The interfacial ultramorphology/nanoleakage of the resin-dentin slabs was analyzed through dye-assisted confocal microscopy.

Statistical analysis:  For quantitative analysis, bond strength values (in MPa) were assessed for normality and variance using Kolmogorov-Smirnov and Levene's tests, followed by ANOVA based on restorative material and adhesive bonding protocol, with Fisher's least significant difference post hoc test (α = 5%).

Results:  SE groups exhibited significantly lower bond strength (17.4 MPa for CERAM; 26.2 MPa for STELA) compared with ER groups (35.8 MPa for CERAM; 33.6 MPa for STELA) (p < 0.05). CERAM applied in SE mode showed significantly lower bond strength compared with STELA applied in SE mode. Furthermore, CERAM applied in SE mode was the only group presenting a pre-test failure rate (27%). The failure mode was predominantly mixed in ER groups and adhesive in SE groups. Nanoleakage was observed clearly in the CERAM groups applied in both ER and SE modes but was less evident in the STELA groups.

Conclusion:  The new self-curing material (STELA) used in SE or ER may represent a promising clinical option to provide adequate interfacial adaptation and strong bonding to dentin when restoring deep class I cavities. The use of conventional adhesives in deep class I cavities may generate resin-dentin interfaces characterized by gaps and leakages.

现代自固化体填充修复体系的键合性能和界面超形貌/纳米泄漏:体外研究
目的:本研究的目的是评估一种创新的自固化修复系统与传统光固化树脂复合材料在牙本质上蚀刻-冲洗(ER)或自蚀刻(SE)模式下的结合性能和界面超微形貌。材料与方法:在健全牙本质上制备20个I类空腔,采用两种材料修复:(1)CERAM (n = 10;陶瓷。X ONE, Dentsply Sirona)与通用粘合剂系统(PBU [Prime & Bond universal])相结合,或(2)STELA (n = 10;Stela Automix (SDI)与其粘合剂底漆相结合。每组各有一半的标本以ER或SE模式键合。标本在人工唾液中保存24小时后进行微拉伸粘结强度测试。使用立体显微镜确定失效模式,并使用扫描电子显微镜进行断口分析。采用染料共聚焦显微镜对树脂-牙本质板的界面超微形貌和纳米渗漏进行了分析。统计分析:定量分析采用Kolmogorov-Smirnov和Levene检验评估粘接强度值(MPa)的正态性和方差,随后采用基于修复材料和胶粘剂粘接方案的方差分析,Fisher事后检验差异最小(α = 5%)。结果:SE组与CERAM的结合强度显著降低(17.4 MPa);STELA组为26.2 MPa, ER组为35.8 MPa;结论:用于SE或ER的新型自固化材料(STELA)可能是一种有前途的临床选择,可以在修复深I类牙槽时提供足够的界面适应和与牙本质的强结合。在深I类牙腔中使用常规粘合剂可能会产生以间隙和泄漏为特征的树脂-牙本质界面。
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来源期刊
European Journal of Dentistry
European Journal of Dentistry Dentistry-Dentistry (all)
CiteScore
5.10
自引率
0.00%
发文量
161
期刊介绍: The European Journal of Dentistry is the official journal of the Dental Investigations Society, based in Turkey. It is a double-blinded peer-reviewed, Open Access, multi-disciplinary international journal addressing various aspects of dentistry. The journal''s board consists of eminent investigators in dentistry from across the globe and presents an ideal international composition. The journal encourages its authors to submit original investigations, reviews, and reports addressing various divisions of dentistry including oral pathology, prosthodontics, endodontics, orthodontics etc. It is available both online and in print.
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