Effect of pH artificial saliva on the surface hardness of glass-hybrid restoration

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Abstract

This study aimed to determine the effect of the immersion period in artificial saliva with various pH on the surface hardness of glass-hybrid restorative material (EQUIA® FORTE Glass-Hybrid Restorative System, GC Corporation, Japan). There were 90 specimens (diameter 6mm, thickness 3mm) divided into nine treatment groups, immersed in artificial saliva with a pH of 4.5; 5.5; and 7 for 1 hour, 24 hours, and 72 hours at 37°C, respectively. Surface hardness was tested using Knoop hardness tester (Shimadzu HMV-G Micro Hardness Tester, Japan) with 50 grams load for 15 seconds, five indentations on each specimen. The results were analyzed statistically with One-way ANOVA (p <0.05). The results showed that there were significant differences between each group. The hardness values of the group immersed in artificial saliva pH 4.5 for 1 hour, 24 hours, and 72 hours were 69,48 ± 0.57 KHN, 54.76 ± 0.23 KHN, and 42.90 ± 0.41 KHN respectively. Meanwhile, the hardness values of the group immersed in artificial saliva pH 5.5 for 1 hour, 24 hours, and 72 hours were 75.34 ± 0.32 KHN, 57.45 ± 0.47 KHN, and 45.84 ± 0.27 KHN respectively. With artificial saliva pH 7 for 1 hour, 24 hours, and 72 hours, the hardness values were 82.89 ± 0.68 KHN, 62.49 ± 0.37 KHN, and 49.84 ± 0.14 KHN respectively. It can be concluded that the lower pH value of artificial saliva and prolonged immersion period can reduce the surface hardness value of glass-hybrid restorative materials.

Original languageEnglish
Title of host publication5th Biomedical Engineering''s Recent Progress in Biomaterials, Drugs Development, and Medical Devices
Subtitle of host publicationProceedings of the 5th International Symposium of Biomedical Engineering, ISBE 2020
EditorsKenny Lischer, Sugeng Supriadi, Siti Fauziyah Rahman, Yudan Whulanza
PublisherAmerican Institute of Physics Inc.
ISBN (Electronic)9780735440869
DOIs
Publication statusPublished - 23 Mar 2021
Event5th International Symposium of Biomedical Engineering, ISBE 2020 - Depok, Virtual, Indonesia
Duration: 28 Jul 202029 Jul 2020

Publication series

NameAIP Conference Proceedings
Volume2344
ISSN (Print)0094-243X
ISSN (Electronic)1551-7616

Conference

Conference5th International Symposium of Biomedical Engineering, ISBE 2020
Country/TerritoryIndonesia
CityDepok, Virtual
Period28/07/2029/07/20

Keywords

  • artificial saliva pH
  • glass-hybrid restorative material
  • immersion period
  • surface hardness

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