Improvement of the setting properties of mineral trioxide aggregate cements using cellulose nanofibrils.

IF 1.9 4区医学 Q2 DENTISTRY, ORAL SURGERY & MEDICINE Dental materials journal Pub Date : 2024-01-30 Epub Date: 2023-12-29 DOI:10.4012/dmj.2023-220

Hiroki Okuda, Miki Inada, Tomoya Konishi, Nobuyuki Kawashima, Takahiro Wada, Takashi Okiji, Motohiro Uo

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Abstract

Cellulose nanofibrils (CNFs) exhibit excellent mechanical properties and are used to reinforce various composites. The effects of incorporating CNFs into commercial mineral trioxide aggregate (MTA) cements (NEX MTA (NEX) and ProRoot^® MTA (PR)) on the underwater setting properties, compressive strength, and flowability were estimated in this study. NEX mixed without CNFs disintegrated after water immersion. NEX mixed with CNF-suspended solutions showed good setting properties under water immersion and a similar compressive strength, which was kept in air (100% relative humidity). PR did not degrade after water immersion, regardless of the presence of CNFs, and no significant difference in the compressive strength caused by CNFs incorporation was detected. The relative flowability of the NEX mixture decreased with increasing CNFs content up to 1.0 w/v%. The application of CNF-incorporated MTA in various dental cases is promising because CNFs prevent the water-immersion-dependent collapse of some MTA cements immediately after mixing.

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利用纤维素纳米纤维改善三氧化物矿物骨料水泥的凝结性能。

纤维素纳米纤维（CNFs）具有优异的机械性能，可用于增强各种复合材料。本研究估算了在商用三氧化二铝矿物骨料（MTA）水泥（NEX MTA (NEX) 和 ProRoot® MTA (PR)）中加入 CNFs 对水下凝固特性、抗压强度和流动性的影响。不含 CNF 的混合 NEX 在浸水后崩解。与 CNF 悬浮溶液混合的 NEX 在水下浸泡后显示出良好的凝固特性，在空气中（相对湿度为 100%）保持类似的抗压强度。无论是否含有 CNF，PR 在水浸泡后都不会发生降解，也没有发现 CNF 的加入会导致抗压强度出现显著差异。NEX 混合物的相对流动性随着 CNFs 含量的增加而降低，最高可达 1.0 w/v%。在各种牙科病例中应用掺入 CNF 的 MTA 是很有前景的，因为 CNF 可防止某些 MTA 水泥在混合后立即因水的浸入而塌陷。

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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%.