Effect of different intrapulpal pressure simulation on microtensile bond strength and hybrid layer thickness in primary incisors

ผลกระทบของแรงดันจำลองที่แตกต่างกันในโพรงในตัวฟันต่อกำลังแรงยึดของสารยึดติดและความหนาของชั้นไฮบริดในฟันตัดน้ำนม

Name: Tapanee Jariyanuwat

LCSH: Dental bonding

Classification :.DDC: 617.695

LCSH: Dentistry

Abstract: Objective: To evaluate effect of different intrapulpal pressure on microtensile bond strength, hybrid layer thickness and the length of resin tags in primary incisors in vitro. Material and methods: Sixty prolonged retention lower primary incisors were collected and tested within 24 hours after extraction. The root was cut off 1.0 mm below the CEJ. The tip of incisal edge was cut off to the level 1 mm deep into dentin. The samples were randomly divided into 0, +15, +30 cmH2O group (n=20 each). The preset hydrostatic pressure system was connected to the tooth specimen. The cut tooth surface and the composite rod surface were treated with acid etching and Single bond as recommended by manufacturer. Both surfaces were fixed with thin layer of flowable composite resin. After 24 hour storage in 37oC distilled water, half of each group was used for tensile bond strength testing in a Universal testing machine. The fracture surfaces were examined by Scanning Electron Microscope to investigate the mode of failure and the mean values of remaining dentin thickness in each group. Another half of each group was cut longitudinal and examined under Scanning Electron Microscope for measuring hybrid layer thickness and resin tags length. The data were analyzed by descriptive analysis and one way ANOVA. The p value less than 0.05 was considered as significant difference. Results: The mean±SD values of tensile bond strength of 0, +15 and +30 cmH2O groups were 11.20±1.41, 10.80±2.46 and 7.58±2.41 MPa respectively. There was no significant different among 0 and +15 cmH2O groups. The tensile bond strength of the +30 cmH2O group was significant lower than the other groups. The mode of failure of bond strength and the mean values of remaining dentin thickness were not statistically significant differences among 3 groups. The mean±SD values of hybrid layer thickness of 0, +15 and +30 cmH2O groups were 4.32±0.05, 3.73±0.10 and 2.94±0.07 μm, respectively and for the resin tags length were 8.74±1.55, 6.92±0.76 and 6.38±0.72 μm, respectively. The thickness of hybrid layer and resin tags length were significant different among 3 groups while the longest and the shortest groups were presented in 0 cmH2O and +30 cmH20 groups, consecutively. Conclusion: This study found that increasing of simulated intrapulpal pressure resulted in decreasing of tensile bond strength, hybrid layer thickness and the length of resin tags, which might affect the ability of dental adhesive.

Chiang Mai University Library

Address: Chiang Mai

Email: cmulibref@cmu.ac.th

Name: Noppakun Vongsavan

Role: Chairman

Name: Varisara Sirimaharaj

Role: Member

Name: Sitthichai Wanachantararak

Role: Member

Created: 2016

Modified: 2020-01-09

Issued: 2020-01-09

วิทยานิพนธ์/Thesis

application/pdf

Th 617.695 T172E

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Dentistry

Grantor: Chiang Mai University

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