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. 2023 Dec 21;17(1):35.
doi: 10.3390/ma17010035.

In Vitro Comparison of Differences in Setting Time of Premixed Calcium Silicate-Based Mineral Trioxide Aggregate According to Moisture Content of Gypsum

Hyun-Jin Kim  1 , Jun-Seok Lee  1 , Dong-Hoon Gwak  1 , Yong-Seok Ko  1 , Chun-Il Lim  1 , Seung-Youl Lee  1
Affiliations

In Vitro Comparison of Differences in Setting Time of Premixed Calcium Silicate-Based Mineral Trioxide Aggregate According to Moisture Content of Gypsum

Hyun-Jin Kim et al. Materials (Basel). .

Abstract

Recently, a paste-type premixed calcium silicate-based mineral trioxide aggregate (MTA) product that quickly solidifies through a pozzolanic reaction was introduced to replace existing MTA, which has the disadvantage of a long setting time. In this study, we evaluated the effect of moisture content in the root canal on the setting time of premixed calcium silicate-based MTA in a simulated root canal environment using Endoseal MTA and Well-Root ST, among commercially available products. The setting time was measured according to ISO 6876/2012. A mold made using grades 2, 3, and 4 dental gypsum according to the classification of ISO 6873/2013 was used to reproduce the difference in moisture environment. Differences in moisture content were measured using micro-computed X-ray tomography (micro-CT). The micro-CT results showed that the moisture content was the highest and lowest in the grade 2 and 4 gypsum molds, respectively. Moreover, the setting time indicated by the manufacturer was the shortest for the grade 2 gypsum mold. Hence, the differences in moisture content significantly affect the setting time of MTA. This result can help set future experimental conditions and develop premixed calcium silicate-based MTA products.

Keywords: gypsum mold; micro-CT; moisture; premixed calcium silicate MTA; setting time.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
(a) Silicone mold for making gypsum casts; (b) gypsum cast made using silicone molds. Grade 2: dental plaster; Grade 3: dental stone; Grade 4: die stone.
Figure 2
Figure 2
Scanning electron micrograph showing particle size and shape of the set gypsum surface: (a,a-1) dental plaster; (b,b-1) dental stone; (c,c-1) die stone. Magnification: (a–c) 500× g; (a-1–c-1) 3000× g.
Figure 3
Figure 3
VOI of gypsum mold and volume rendering of the pore distribution (green) within the segments of each gypsum mold obtained through micro-CT analysis. (a,a-1) Dental plaster; (b,b-1) dental stone; (c,c-1) die stone.
Figure 4
Figure 4
Surface area and number distribution graph of gypsum pores measured by micro-CT.
See this image and copyright information in PMC

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