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63. Evaluation of Incipient Enamel Caries at Smooth Tooth Surfaces Using SS-OCT

Author

Shimada, Yasushi, primary, Sato, Takaaki, additional, Inoue, Go, additional, Nakagawa, Hisaichi, additional, Tabata, Tomoko, additional, Zhou, Yuan, additional, Hiraishi, Noriko, additional, Gondo, Tadamu, additional, Takano, Syunsuke, additional, Ushijima, Kei, additional, Iwabuchi, Hirotoshi, additional, Tsuji, Yukiko, additional, Alireza, Sadr, additional, Sumi, Yasunori, additional, and Tagami, Junji, additional

Published
2022
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74. Relationship between taste sensitivity and dental caries

Author

Arakawa, Makoto, Kaneko, Jun, Cruz de Jesus, Vivianne, Sonoda, Hidekazu, Yoshida, Naomi, and Tagami, Junji

Subjects
stomatognathic diseases, stomatognathic system, dental caries, taste sensation, taste perception, PROP(6-n-propylthiouracil)
Abstract

Dental caries is still one of the most common diseases to afflict mankind. It affects 34.1% of the global population. Some studies have reported that individuals with high sugar intake have higher dental caries rates. However, the physiological mechanisms underlying an individual’s craving for sweet substances were not well documented. It was also reported that taste sensitivity may be associated with the preference for or rejection of some foods. Sweet preference has been linked to bitter taste sensitivity to 6-n-propylthiouracil (PROP). The PROP impregnated paper strip is proved to be a useful tool in determining the inherent sensitivity levels (super-taster, medium-taster, and non-taster) to bitter and sweet tastes. The purpose of this study is to evaluate the relationship between taste sensitivity to PROP and dental caries. The results showed a significantly larger number of untreated dental caries lesions among non-tasters compared to super-tasters. However, there was no statistically significant difference in the DMFT index value among the three groups. These results suggest that taste sensitivity to PROP could be a useful screening tool to identify individuals with high dental caries risk.

Published
2021

83. Hydroxyapatite Affects the Physicochemical Properties of Contemporary One-Step Self-Etch Adhesives

Author

Motoyama, Yutaro, Yamauti, Monica, 1000050272604, Nakajima, Masatoshi, 1000020549927, Ikeda, Masaomi, 1000050171567, Tagami, Junji, 1000060282761, Shimada, Yasushi, 1000080451946, Hosaka, Keiichi, Motoyama, Yutaro, Yamauti, Monica, 1000050272604, Nakajima, Masatoshi, 1000020549927, Ikeda, Masaomi, 1000050171567, Tagami, Junji, 1000060282761, Shimada, Yasushi, 1000080451946, and Hosaka, Keiichi

Abstract

The study aimed to evaluate the influence of the manipulation surfaces on the physical properties of one-step self-etch adhesives (1-SEAs). Scotchbond Universal (SBU), Clearfil Universal Bond Quick ER (UBQ), and an experimental adhesive (UBQ(exp)) were manipulated on different surfaces: manufacturer's Teflon-based dispensing dish (TD) or hydroxyapatite plate (HA). After manipulation of the adhesives, the pH of each 1-SEA was measured. Samples of each adhesive/manipulation surface were prepared and subjected to water sorption (WS)/solubility (SL) and flexural strength tests. The modulus of elasticity (E) was measured in dry and wet conditions before and after 24 h water storage, and the percentage of variation of E (Delta E) was calculated. Results were analyzed using the t-test with Bonferroni corrections (alpha = 0.05). When adhesives were manipulated on the HA plate, there was a significant increase in the adhesives' pH. WS and SL of all 1-SEAs decreased when the HA was used. Only SBU showed higher flexural strength when manipulated on the HA compared to the manipulation on TD under dry and wet conditions. For each 1-SEA, the use of HA resulted in significantly higher E in dry and wet conditions. Delta E of all adhesives was smaller with the manipulation on HA than on TD. It was concluded that the manipulation of 1-SEA on a hydroxyapatite plate considerably affected the adhesives' properties.

Published
2022

84. Effect of Surface Pre-Reacted Glass Ionomer Containing Dental Sealant on the Inhibition of Enamel Demineralization

Author

Ogawa, Yuko, Sayed, Mahmoud; https://orcid.org/0000-0003-0219-4251, Hiraishi, Noriko; https://orcid.org/0000-0002-7957-2305, Al-Haj Husain, Nadin, Tagami, Junji, Özcan, Mutlu; https://orcid.org/0000-0002-9623-6098, Shimada, Yasushi; https://orcid.org/0000-0002-0751-4819, Ogawa, Yuko, Sayed, Mahmoud; https://orcid.org/0000-0003-0219-4251, Hiraishi, Noriko; https://orcid.org/0000-0002-7957-2305, Al-Haj Husain, Nadin, Tagami, Junji, Özcan, Mutlu; https://orcid.org/0000-0002-9623-6098, and Shimada, Yasushi; https://orcid.org/0000-0002-0751-4819

Abstract

The effect of a surface pre-reacted glass ionomer (S-PRG)-containing sealant on the demineralization inhibition and remineralization of intact enamel adjacent to the sealant material was investigated. BeautiSealant (BTS, S-PRG sealant, Shofu), Teeth Mate F-12.0 (TMF, fluoride-releasing sealant, Kuraray Noritake Dental), and an experimental silica-filler sealant were investigated. After pH cycling for 10 days, the enamel surface adjacent to the sealant material was observed using confocal laser microscopy and scanning electron microscopy. The polymerized sealant disks were immersed in a demineralized solution (pH: 4.3) to measure pH change. The enamel specimens with polymerized sealant disks were additionally immersed in demineralized solution, followed by energy-dispersive X-ray spectroscopy. The demineralized area of BTS was significantly smaller than that of TMF and SS (p < 0.05). The surfaces adjacent to the sealant of TMF and SS were demineralized, while the surface of BTS was comparatively intact. An increase in pH values were observed in the BTS and TMF groups. Enamel surfaces presented an inhibition of demineralization for BTS and TMF, but not for SS. Fluoride uptake from the polymerized sealant was greater for BTS than for TMF. The S-PRG-containing sealant showed a buffering ability, demineralization inhibition, promotion of remineralization, and it can be advised for clinical applications.

Published
2022

98. Morphological and elemental analysis of silver penetration into sound/demineralized dentin after SDF application

Author

Sayed, Mahmoud, Matsui, Naoko, Uo, Motohiro, Nikaido, Toru, Oikawa, Masakazu, F. Burrow, Michael, Tagami, Junji, and Masakazu, Oikawa

Subjects
stomatognathic diseases, stomatognathic system
Abstract

Objective The aim of this study was to evaluate the penetration depth of silver into sound and demineralized dentin after application of silver diamine fluoride (SDF). Methods Two hundred and eighty-eight dentin specimens were used. The specimens were divided into 3 groups: (1) sound dentin (control), (2) 30 min EDTA-treated dentin; and (3) 13 h EDTA-treated dentin. SDF was applied to all specimens. Each group was divided into 3 subgroups according to storage time into: 24 h, 2 weeks and 1-year storage time. Each subgroup was further divided into four subgroups (n = 8) according to different examinations as optical microscope (OM) observation, scanning electron microscopic (SEM) observation, elemental analysis with energy dispersive spectroscopy (EDS) and Micro-PIXE test. Results The OM showed discoloration in the superficial layer after 24 h and keep extending deeper after 2 weeks and 1-year. SEM showed silver crystals within dentinal tubules after 2 weeks and 1-year. EDS analysis can detect silver penetration only in the 1-year group reaching around 1200 μm inside dentin. Micro-PIXE test detected silver at all time intervals, confirming the EDS depth results. Significance It can be concluded that silver ions can completely infiltrate the demineralized dentin lesion with further penetration into the underlying mineralized dentin.

Published
2019

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