AIM: The study aimed to compare teeth sensitivity and shade after bleaching protocol with descending different light intensities versus bleaching protocol with the same high light intensity. MATERIAL AND METHODS: Sample size was twenty-four patients. Each group consisted of twelve patients. Group, I patients received bleaching protocol of descending different light intensities. Group II patients received bleaching protocol with the same high light intensity; both groups used the same home bleaching gel kit for seven days according to manufacturer instructions and protocol. Baseline records were digital photographs, teeth sensitivity and teeth shade for 12 anterior teeth. Teeth sensitivity was assessed using five points verbal rating scale and Standardized 100 mm Visual analogue scale after 1 day, after 2 days and after 1 week. Teeth shades for twelve anterior teeth were recorded by VITA Easy Shade V (VITA Zahnfabrik H. Rauter GmbH & Co. KG, Germany) after 1 week by VITA Easy Shade V. Mann-Whitney test (non-parametric test, 2 independent samples) was used to compare teeth sensitivity between both bleaching protocols at each period. A paired t-test (parametric test, 2 related samples) was performed to compare the colour change in shade guide units (SGU) and ∆E values within high light intensity bleaching protocol. While Wilcoxon Signed-Rank test (non-parametric test, 2 related samples) was used to compare colour change light intensities bleaching protocol. Comparison of bleaching effectiveness (∆SGU and ∆Ediff) between both bleaching protocols was performed by the Mann-Whitney test. RESULTS: Descending light intensities protocol showed a lower teeth sensitivity than high light intensity protocol after 1 and 2 days. There was no teeth sensitivity reported at 1-week post-bleaching. Regarding the teeth shade, descending light intensities protocol had a little higher effect on colour change in shade guide units (SGU) than high light intensity protocol effect. Both bleaching protocols showed there was no significant difference in ∆SGU recorded after bleaching between high and descending light intensities protocols. CONCLUSION: Descending different light intensities protocol showed a lower teeth sensitivity than high same light intensity protocol. Descending light intensities protocol had a little higher effect on colour change in shade guide units (SGU) than high light intensity protocol effect.
Objective: To compare the remineralization outcome of CPP-ACP without or with fluoride "MI Paste" & "MI Paste Plus" on the re-mineralization of enamel caries-like lesions in bovine teeth.Material and methods: 21 clean sound bovine teeth were collected and prepared. All samples were mounted in acrylic molds. Randomization was done to divide them into 3 groups (n= 7 teeth); (GPI: Control Group no treatment; were not exposed to demineralization nor remineralizing agents only exposed to synthetic saliva, GPII: MI Paste and GPIII: MI Paste Plus. Each group was examined by (SEM) with magnifying range 6000,12000x and EDX analysis were taken place before demineralization, after 72 hrs of demineralization and after 21 days of remineralization. Data were analyzed by using Independent t-test to compare between different groups, while comparison between control, demineralization and remineralization was performed by using One Way ANOVA test followed by Tukey`s Post Hoc test for multiple comparisons.Results: Morphological changes of enamel surfaces of "MI Paste" and "MI Paste Plus" showed better appearance. For chemical analysis "MI Paste Plus" showed significantly better results than "MI Paste" with an increased amount of calcium & calcium/ Phosphate ratio. Conclusion:Results emphasize the positive effect of both pastes in enamel remineralization. Also, addition of fluoride in "MI Paste Plus" had a synergistically effect with the CPP-ACP and provided better remineralization.
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