- 著者
- KANNO Tama OGATA Miwako FOXTON Richard Mark NAKAJIMA Masatoshi TAGAMI Junji MIURA Hiroyuki
- 出版者
- 一般社団法人日本歯科理工学会
- 雑誌
- Dental materials journal (ISSN:02874547)
- 巻号頁・発行日
- vol.23, no.4, pp.550-556, 2004-12
- 被引用文献数
- 13 14
The purpose of this study was to measure the bond strength of dual-cure resin cement at different regions of root canal dentin using three kinds of curing method. Thirty-six extracted bovine teeth were used. Each root was sectioned vertically into halves. Their pulpal dentin walls were polished flat and then applied with two dual-cure resin cements (Bistite II, Panavia F), and divided into three curing strategy groups : multi-direction light, one-direction light and no-light. The bonded specimens were sectioned perpendicularly to the long axis of the root into approximately 0.7 mm thick slabs within two-third of the root from the coronal end, and prepared for microtensile bond strength (μTBS) test. Knoop hardness of the cements was also measured. Within each curing strategy for both dual-cure resin cements, there were no significant differences between the μTBS values at the coronal third and mid third regions. The effect of curing method on bond strength and KHN was found to be dependent on the material.
- 著者
- Nakano Hirokazu Yoshida Akihide Ogasawara Kazushi Sanjo Akira Tanaka Shigeru Kamegai Takuya Satoh Kazuro Miura Hiroyuki
- 出版者
- 日本矯正歯科学会
- 雑誌
- Orthodontic waves : journal of the Japanese Orthodontic Society : 日本矯正歯科学会雑誌 (ISSN:13440241)
- 巻号頁・発行日
- vol.60, no.6, pp.398-401, 2001
The purpose of this study was to clarify the surface roughness of 31 brands of titanium alloy orthodontic wires from 13 manufacturers using a confocal optical microscope. Cobalt-chrome and stainless steel wire were also examined as a reference of comparison. The following results were obtained ; (1) Mean Ra, as determined from the lengthway axis of titanium alloy wires, was 0.296μm, and that determined from the widthway axis was 0.440μm. The modulus of Ra was 0.368μm. (2) For titanium alloy orthodontic wires, the greatest amount of modulus of Ra was 1.244μm and the lowest was 0.135μm. (3) Modulus of Ra was 0.140μm for the cobalt-chrome wire and 0.154μm for the stainless steel wire, each lower tendency than titanium alloy. As a result of our findings, we consider it necessary to select the smoother wire possible when using a sliding mechanism, if the mechanical properties of available wires are nearly the same.