Kabushiki Kaisha Matsutani Seisakusho

Matsutani Seisakusho Co., Ltd.

Satoshi Tezuka

Kanji Matsutani

Kaoru Ohgane

Masao Aono

Kohji Yamamoto

Diamond bur A has base metal 1 formed with cylindrical shank 1b on one side of diamond bur A, and cutting portion 1a formed on base metal 1 on the other side of diamond bur A extending over a given length from an end of diamond A. A mixture 2 of various abrasive grains with three different grain sizes are secured to cutting portion 1a. Since various abrasive grains with different grain sizes are secured to cutting portion 1a, with the increase of load applied on artificial tooth, the number of abrasive grains contributing to cutting increases, and the machinability is improved. This tendency is equal to the machinability of the diamond bur on the market for cutting human dentin, or dental enamel.

Practical cutting bur and method of training using same for the cutting

There is provided a rotary drilling instrument having uniform hardness, free from rust, and made of austenitic stainless steel possessing a hardness substantially the same as quenched steel or quenched martensitic stainless steel. The rotary drilling instrument is formed with a cutting section formed at one end of a body, a shank formed at the other end of the body, and a neck portion formed between the cutting section and the shank. The rotary drilling instrument is made of austenitic stainless steel having a fibriform organization elongated in a longitudinal direction and has a surface having a predetermined hardness.

Rotary drilling instrument

A dental diamond bar comprising a grinding section which has diamond abrasive grains electrodeposited on an outer peripheral surface of a forward end portion of a bar body. A paint-applied section has a colored paint applied to an outer peripheral surface of a part of the bar body. The paint-applied section is located adjacent a rearward edge of the grinding section. In a method of manufacturing the diamond bar, the colored paint is applied to the bar body to form the paint-applied section. Masking liquid is applied to the bar body to form a masking section. The masking section has a forward edge which is located between forward and rearward edges of the paint-applied section. The masking section extends from the paint-applied section toward a rearward end of the bar body. The masking section is removed after formation of the grinding section.

Growing community of inventors

Tochigi-ken, Japan

Satoshi Tezuka