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- Title
Newly developed hardness testing system, "Cariotester": Measurement principles and development of a program for measuring Knoop hardness of carious dentin.
- Authors
SHIMIZU, Akihiko; NAKASHIMA, Syozi; NIKAIDO, Toru; SUGAWARA, Toyotaro; YAMAMOTO, Takatsugu; MOMOI, Yasuko
- Abstract
We previously discovered that when a cone-shaped indenter coated with paint was pressed into an object, the paint disappeared in accordance with the depth of the indentation. Based on this fact, we developed the Cariotester, a portable system for measuring the Knoop hardness (KEN) of carious dentin. The Cariotester is composed of a handpiece with an indenter, a microscope, and a computer. In this system, the painted indenter is forced into the material with a 150-gf load, and the indentation depth (CT depth) is obtained from the paint disappearance. The CT depth by the Cariotester and the KEN by a microhardness tester were determined at 14 dentin regions. From the data, a program was created to convert the CT depth of the carious dentin into the KEN. As a result, if the CT depth is measured with this system, the KEN of carious dentin can be displayed in real time.
- Subjects
PAINT; PAINT factories; PAINT removal; HARDNESS testing; DENTIN anatomy
- Publication
Dental Materials Journal, 2013, Vol 32, Issue 4, p643
- ISSN
0287-4547
- Publication type
Article
- DOI
10.4012/dmj.2012-312