Chulalongkorn University Dental Journal

Publication Date



Objective To study the effect of chlorhexidine (CHX) as a vehicle for sodium perborate (SP) on microleakage of resin composite by using glucose filtration. Materials and methods Thirty six single-rooted teeth were used. The specimens with cavity were prepared and divided into three groups: Group 1, SP mixed with 2% CHX; Group 2, SP mixed with distilled water; Group 3, SP mixed with 30% hydrogen peroxide. With a total conduction of three times, bleaching agent was applied in the cavities for 1 week and rinsed. The cavities were then filled with resin composite. The specimens were thermocycled for 500 cycles, followed by a microleakage determination (glucose filtration). The concentration of leaked glucose was analyzed by spectrophotometer. Dentin surfaces of each group were prepared and observed under SEM. Results Mean concentrations and standard deviations of leaked glucose (mM) were 1.001 ± 0.147, 1.005 ± 0.093, and 1.304 ± 0.406, in Groups 1, 2, and 3, respectively. Inter-group significant differences were found by a one-way ANOVA (p < 0.05). Using the post-hoc Tukey HSDûs test analysis, some significant differences were found between Groups 1 and 3, together with Groups 2 and 3 (p < 0.05). The morphology of dentin surfaces under SEM of Group 1 showed mild erosion similar to that of Group 2. Group 3 showed more eroded dentin. Conclusion Using CHX as a vehicle for SP in this study did not affect the microleakage of resin composite and dentin. Clinically, CHX may be a good vehicle for non-vital tooth bleaching.



First Page


Last Page


Included in

Dentistry Commons



To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.