Network integrity of bulk-fill composites: Thermal stability, post-curing hardness development and acidic softening.

IF 1.9 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE Dental materials journal Pub Date : 2025-04-01 Epub Date: 2025-02-14 DOI:10.4012/dmj.2024-247

Mohammed Aldhafyan, Abdel-Basit Al-Odayni, Waseem Sharaf Saeed, Rawaiz Khan, Ali Alrahlah

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Abstract

This study investigated the thermal stability and top-to-bottom hardness ratio of six bulk-fill composites (STARK^® Bulk Fill Composite, Filtek™ One Bulk Fill Restorative, SDR^® Plus Bulk Fill Flowable, Tetric^® N-Ceram Bulk Fill, X-tra fil, and Beautifil-Bulk Restorative) following acidic softening. Discs-shaped specimens were fabricated and photo-cured for 20 s. Vickers hardness was sequentially measured, immediately after irradiation (VH₀), after 24 h of dry storage (VH_dry) and after 24 h of acidic storage (VH_acidic) at 37°C. Network integrity was assessed by comparing the relative hardness decrease (VH_RD) after acidic softening with the initial maximum rate temperature (IRT) of mass loss. Compared to VH₀, VH_dry significantly increased, whereas VH_acidic significantly decreased. The VH_RD of top surface ranged from 16.62% for FBF to 62.84% for SDR. IRT primarily reflects resin composition and residue is a filler-based value. Relative network integrity estimated by IRT revealed a negative correlation with VH_RD. Consequently, acidic erosion hardness development can be indirectly employed to assess network integrity in bulk-fill composites.

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块体填充复合材料的网络完整性：热稳定性、固化后硬度发展和酸性软化。

本研究研究了六种散装填充复合材料（STARK®散装填充复合材料、Filtek™One散装填充修复材料、SDR®Plus可流动散装填充材料、Tetric®N-Ceram散装填充材料、X-tra fil和beautifil -散装修复材料）在酸性软化后的热稳定性和上下硬度比。制作盘状标本，光固化20 s。在37℃条件下，分别测定辐照后（VH0）、干贮存24 h （VHdry）和酸贮存24 h （vhacid）后的维氏硬度。通过比较酸软化后的相对硬度降低（VHRD）与初始最大失重速率温度（IRT）来评估网络完整性。与VH0相比，VHdry显著升高，vhacid显著降低。顶面VHRD为FBF的16.62% ~ SDR的62.84%。IRT主要反映树脂成分和残渣是一个以填料为主的值。IRT估计的相对网络完整性与VHRD呈负相关。因此，酸性侵蚀硬度发展可以间接用于评估块体填充复合材料的网络完整性。

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来源期刊

Dental materials journal 医学-材料科学：生物材料

CiteScore

4.60

自引率

4.00%

发文量

102

审稿时长

3 months

期刊介绍： Dental Materials Journal is a peer review journal published by the Japanese Society for Dental Materials and Devises aiming to introduce the progress of the basic and applied sciences in dental materials and biomaterials. The dental materials-related clinical science and instrumental technologies are also within the scope of this journal. The materials dealt include synthetic polymers, ceramics, metals and tissue-derived biomaterials. Forefront dental materials and biomaterials used in developing filed, such as tissue engineering, bioengineering and artificial intelligence, are positively considered for the review as well. Recent acceptance rate of the submitted manuscript in the journal is around 30%.