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Does gradual dehydration affect the mechanical properties and bonding outcome of adhesives to dentin?
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| Title: | Does gradual dehydration affect the mechanical properties and bonding outcome of adhesives to dentin? |
| Other Titles: | 乾燥処理時間は象牙質の物性と接着性能に影響を与えるか？ |
| Authors: | CHOWDHURY, ABU FAEM MOHAMMAD ALMAS Browse this author |
| Keywords: | Dehydration | | Two-step self-etch adhesive | | Microtensile bond strength | | Hardness | | Elastic modulus | | Weight loss | | Cohesive failure |
| Issue Date: | 22-Mar-2018 |
| Publisher: | Hokkaido University |
| Abstract: | Objectives To evaluate the effects of dehydration on the Hardness (H) and Elastic Modulus (E) of adhesives and dentin, and on the Microtensile Bond Strength (μTBS) of adhesives to dentin. Methods Flat, mid-coronal dentin surfaces of twenty human third molars were exposed and polished with 600-grit SiC paper. They were then randomly treated with Clearfil Mega Bond (MB) or Clearfil SE Bond 2 (SE2) and built-up with composite resin. After water-storage (37° C; 24 h), μTBS of wet (SE2W and MBW; tested at 5 min after removal from the storage) and dry (SE2D and MBD; tested at 10 min) specimens were obtained by subjecting resin/dentin beams (1 mm2) to a universal tester at a crosshead speed of 1 mm/min. Fracture modes were determined by scanning electron microscope. The changes in the H, E and weight of dehydrating dentin-only beams and adhesive discs were monitored over time. The μTBS data were analyzed by two-way ANOVA and Tukey’s test. The H, E and weight-loss data were analyzed by one-way repeated measures ANOVA and Bonferroni’s test (α = 0.05). Results Significant differences in bond strength were observed for adhesives (p < 0.05) and for conditions (dry vs. wet, p < 0.001). Dehydration caused significant gradual changes (p < 0.05) in the H, E and weight-loss of adhesives and dentin. However, the changes in dentin’s E were not significant (p > 0.05). Significance Gradual dehydration of μTBS testing specimens can cause significant changes in the test outcomes and should be avoided as a significant source of test variation. |
| Conffering University: | 北海道大学 |
| Degree Report Number: | 甲第13049号 |
| Degree Level: | 博士 |
| Degree Discipline: | 歯学 |
| Examination Committee Members: | (主査) 教授 佐野 英彦, 教授 吉田 靖弘, 教授 井上 哲 |
| Degree Affiliation: | 歯学研究科（口腔医学専攻） |
| Type: | theses (doctoral) |
| URI: | http://hdl.handle.net/2115/89185 |
| Appears in Collections: | 課程博士 (Doctorate by way of Advanced Course) > 歯学院(Graduate School of Dental Medicine)
学位論文 (Theses) > 博士 （歯学）
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