Newly developed hardness testing system, %26quot;Cariotester%26quot;: Measurement principles and development of a program for measuring Knoop hardness of carious dentin

作者：Shimizu Akihiko^*; Nakashima Syozi; Nikaido Toru; Sugawara Toyotaro; Yamamoto Takatsugu; Momoi Yasuko

来源：Dental Materials Journal, 2013, 32(4): 643-647.

DOI：10.4012/dmj.2012-312

• Carious dentin
• Knoop hardness
• Cariotester

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 (KHN) 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 KHN. As a result, if the CT depth is measured with this system, the KHN of carious dentin can be displayed in real time.

• 出版日期2013-8