Optical Hardness Meter for Diagnosis of Dental Root Caries

Hazama, Hisanao

doi:https://doi.org/10.1117/12.3072178

Optical Hardness Meter for Diagnosis of Dental Root Caries

Hazama, Hisanao

Proceedings of SPIE - The International Society for Optical Engineering, 2025, 13702, 1370202

アクセス数:24件（2026-02-16 01:18 集計）

固定URL: https://hdl.handle.net/11094/103315

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タイトル	Optical Hardness Meter for Diagnosis of Dental Root Caries
著者	NRID 1000070437375 1000070437375 ORCID 0000-0003-3377-9383 0000-0003-3377-9383 researchmap permalink hisanao.hazama hisanao.hazama Scopus Author ID 16238518600 16238518600 著者名 Hazama, Hisanao
キーワード等	demineralization
	dentin
	hardness
	light-emitting diode
	root caries
	total internal reflection
内容	Hazama H. Optical Hardness Meter for Diagnosis of Dental Root Caries. Proceedings of SPIE - The International Society for Optical Engineering 13702, 1370202 (2025); https://doi.org/10.1117/12.3072178.
抄録	A method to quantitatively evaluate the progress of root caries in a clinical setting is strongly desired. The root caries could be diagnosed by measuring hardness because dentin becomes softer as the caries progresses. Vickers hardness, which has been customarily used as an indicator of tooth hardness, cannot be measured in vivo because the teeth must be polished and dried prior to measurement to make the indentation. A hardness meter using an indenter with light for tooth monitoring (HAMILTOM) is proposed to measure hardness of teeth in a wet condition. An area appearing black without a total internal reflection at an indenter of HAMILTOM increases as a dentin becomes softer. Bovine dentin samples with different hardnesses were used, and the correlation between the dark areas measured by HAMILTOM and the Vickers hardness measured by the Vickers hardness tester was evaluated. Twenty bovine dentins were demineralized by a lactic acid solution with different times and divided into groups 1 and 2 of 10 samples each. Group 1 was used to obtain a calibration curve to calculate Vickers hardness from the dark area. Group 2 was used to validate the calibration curve. The Vickers hardness of group 2 calculated by the dark areas of group 2 and the calibration curve obtained in group 1 and the Vickers hardness of group 2 measured by the Vickers hardness tester were strongly correlated with a determination coefficient of 0.99. The results demonstrate that HAMILTOM may be a suitable alternative to the conventional method.
会議情報	会議名 Biomedical Imaging and Sensing Conference 2025 開催期間 21–25 April 2025 開催地 Yokohama 開催国日本
出版者	SPIE
収録物名	Proceedings of SPIE - The International Society for Optical Engineering
巻(号)	13702
ページ	1370202
刊行年月	2025-07-23
言語	英語
ハンドルURL	https://hdl.handle.net/11094/103315
PISSN	0277786X
eISSN	1996756X
関連情報 (isVersionOf)	DOI (出版社版) https://doi.org/10.1117/12.3072178
アクセス権	open access
権利情報	© 2025 SPIE. All rights reserved.
出版タイプ	Accepted Manuscript
カテゴリ	会議発表論文 Conference Paper

資源タイプ	会議発表論文
ローカル資源タイプ	会議発表論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Proceedings of SPIE - The International Society for Optical Engineering. 2025, 13702, p. 1370202
DC.title	Optical Hardness Meter for Diagnosis of Dental Root Caries
DC.creator	Hazama, Hisanao
DC.publisher	SPIE
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-07-23
DC.identifier	https://doi.org/10.1117/12.3072178
DC.subject	demineralization
	dentin
	hardness
	light-emitting diode
	root caries
	total internal reflection
DC.description	Hazama H. Optical Hardness Meter for Diagnosis of Dental Root Caries. Proceedings of SPIE - The International Society for Optical Engineering 13702, 1370202 (2025); https://doi.org/10.1117/12.3072178.
DCTERMS.abstract	A method to quantitatively evaluate the progress of root caries in a clinical setting is strongly desired. The root caries could be diagnosed by measuring hardness because dentin becomes softer as the caries progresses. Vickers hardness, which has been customarily used as an indicator of tooth hardness, cannot be measured in vivo because the teeth must be polished and dried prior to measurement to make the indentation. A hardness meter using an indenter with light for tooth monitoring (HAMILTOM) is proposed to measure hardness of teeth in a wet condition. An area appearing black without a total internal reflection at an indenter of HAMILTOM increases as a dentin becomes softer. Bovine dentin samples with different hardnesses were used, and the correlation between the dark areas measured by HAMILTOM and the Vickers hardness measured by the Vickers hardness tester was evaluated. Twenty bovine dentins were demineralized by a lactic acid solution with different times and divided into groups 1 and 2 of 10 samples each. Group 1 was used to obtain a calibration curve to calculate Vickers hardness from the dark area. Group 2 was used to validate the calibration curve. The Vickers hardness of group 2 calculated by the dark areas of group 2 and the calibration curve obtained in group 1 and the Vickers hardness of group 2 measured by the Vickers hardness tester were strongly correlated with a determination coefficient of 0.99. The results demonstrate that HAMILTOM may be a suitable alternative to the conventional method.
DC.rights	© 2025 SPIE. All rights reserved.
DC.format	103315
citation_title	Optical Hardness Meter for Diagnosis of Dental Root Caries
citation_author	Hazama, Hisanao
citation_publisher	SPIE
citation_language	英語
citation_date	2025-07-23
citation_journal_title	Proceedings of SPIE - The International Society for Optical Engineering
citation_volume	13702
citation_firstpage	1370202
citation_doi	https://doi.org/10.1117/12.3072178
citation_public_url	https://hdl.handle.net/11094/103315

Optical Hardness Meter for Diagnosis of Dental Root Caries

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