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 : 2025-02-14 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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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%.