- 著者
- Bayarmaa Batzorig Kenjiro Nakano Kosei Murata Mayumi Maesako Kazuho Inoue Takafumi Kishimoto Shigetaka Tomoda Hatsuhiko Maeda Taku Horie Morioki Fujitani
- 出版者
- THE SOCIETY FOR HARD TISSUE REGENERATIVE BIOLOGY
- 雑誌
- Journal of Hard Tissue Biology (ISSN:13417649)
- 巻号頁・発行日
- vol.30, no.1, pp.19-26, 2021 (Released:2021-01-27)
- 参考文献数
- 29
In the treatment of dentin hypersensitivity accompanying tooth substance defects such as wedge-shape defects, hypoesthesia can be achieved by applying a desensitizing agent before carrying out restoration using resin composite. However, almost no research has investigated the adhesion of resin to dentin coated with the latest desensitizing agents. Therefore, this study investigated the effects of various desensitizing agents on the adhesion of resin to dentin in combination with a 1-step self-etch system by using a hypersensitive dentin model in which the dentinal tubules were opened without etching and there was almost no smear layer on the intertubular dentin. Specimens with a #4000 polished dentin flat surface were ultrasonically cleaned for 60 min (15 min × 4 times). Then, the bond strength, failure modes, and micromorphology of surfaces coated with desensitizing agent to which resin was bonded immediately afterward and surfaces coated with desensitizing agent to which the resin was bonded after storage for 7 days in water were compared against a control to which no desensitizing agent was applied. The desensitizing agents used in this research did not promote adhesion of the resin immediately after application, but rather suppressed or completely obstructed it. Although deposits of microparticles and thin film material, which were observed immediately after application, tended to disappear after 7 days of storage in water, some of the desensitizing agents exhibited the same bond strength as the control, whereas other desensitizing agents did not show recovery of adhesion strength. Therefore, care is required when performing resin restoration immediately after application of a desensitizing agent, depending on the agent used, and caution must be exercised in the selection of desensitizing agents in the clinical setting.
- 著者
- Anuudari Erkhembaatar Ryoko Kawai Seeta Kato Waka Yoshida Kei Kamiya Yoshitaka Nagaya Tomofumi Hattori Yoshihiko Sugita Katsutoshi Kubo Hatsuhiko Maeda
- 出版者
- 硬組織再生生物学会
- 雑誌
- Journal of Hard Tissue Biology (ISSN:13417649)
- 巻号頁・発行日
- vol.23, no.2, pp.149-154, 2014 (Released:2014-04-14)
- 参考文献数
- 28
- 被引用文献数
- 1 1
To date, more than 120 total types of HPV have been identified, and in a recent meta-analysis, HPV was confirmed as an independent risk factor for oral carcinoma. Some investigators have reported that HPV infection is related to certain factors, including the gender, age, alcohol consumption, smoking habit, sexual behavior and denture wearing. Denture wearing can lead to denture epulis, which is a hyperplasia of fibrous connective tissue caused by denture irritation. Recently, HPV infection was detected in the hyperplastic epithelium of denture fibroma, but it still has received little study. The objective of the present investigation, therefore, was to clarify the relationship between the hyperplastic epithelium of the denture epulis and HPV infection. DNA of 118 formalin-fixed, paraffin-embedded hyperplastic epithelium biopsies of epulis specimens was extracted. Firstly, HPV infection was detected by PCR using consensus primers. Secondary, PCR using HPV type-specific primers (low risk types 6 and 11; high risk types 16, 18 and 33) was done in positive PCR samples. HPV infection was also detected by in situ hybridization and immunohistochemical techniques. Eighteen (23.1 %) of the 78 cases of denture epulis were positive, and 2 (5.0 %) of the 40 cases of non-denture epulis were positive. The difference was statistically significant (p<0.05, using Fisher’s exact test). The most frequent type of HPV found in the 14 positive samples was HPV 16. It seems that the hyperplastic epithelium of denture epulis is easily infected with viruses because the epithelium is exposed daily to traumatic irritation from dentures. These results suggest that the hyperplastic epithelium of denture epulis might be an important reservoir for HPV infection of the oral region where later HPV-associated diseases, such as oral cancer and other oral lesions, may develop.