Volume 14, Issue 1 (March- 2025)
Caspian J Dent Res 2025, 14(1): 39-48 |
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Bagheri M, Ghoreishi N, Mahmoodi E, Esmaeil B, Mokhtarpour F, Ahmadi G. Effect of Two Calcium-based Materials on Dentin Microhardness and Composite bond strength after Internal bleaching. Caspian J Dent Res 2025; 14 (1) :39-48
URL: http://cjdr.ir/article-1-500-en.html
URL: http://cjdr.ir/article-1-500-en.html
Mohamad Bagheri 
, Niloufar Ghoreishi , Elham Mahmoodi , Behnaz Esmaeil , Faraneh Mokhtarpour , Ghazaleh Ahmadi *
, Niloufar Ghoreishi , Elham Mahmoodi , Behnaz Esmaeil , Faraneh Mokhtarpour , Ghazaleh Ahmadi *
Oral Health Research Center, Health Research Institute, Babol University of Medical Sciences, Babol, Iran. , gazaleh_a@yahoo.com
Abstract: (85 Views)
Introduction: The primary aim of this study was evaluate and compare the effect of CPP-APC (Casein phosphopeptide–amorphous calcium phosphate), calcium hydroxide, and their combination on dentin microhardness follow internal bleaching with hydrogen peroxide, and to assess the influence of these interventions on the shear bond strength of composite resin to dentin.
Materials & Method: In this study, 24 sound extracted human premolare teeth were collected and sectioned buccolingually, yielding a total of 48 dentin specimens. baseline microhardnes was recorded in the designated area. Subsequently, internal bleaching was performed in the same region, and the specimens were incubated for 5 days. post-bleaching microhardness was recorded. The specimens were randomly divided into four group: control, calcium hydroxide, CPP-ACP, and a combination of CPP-ACP and calcium hydroxide. The samples were incubated for one week, after which final microhardness measurements were obtained. Composites resin was then bonded to the dentin surface using a cylindrical plastic mold with a standardized cross-sectional dimension and a height of 3 mm. Shear bond strength and failure modes were recorded by observation under a stereomicroscope.
Results: Internal bleaching with 35% hydrogen peroxide significantly decrease dentin microhardness in all specimen. Following application of the tested materials, statistically significant differences were observed among the group, with the control group showing the lowest microhardness values. Significant increases in microhardness were found in the CPP-ACP and CPP-ACP + calcium hydroxide groups, with the highest values recorded in the combination group. Although the combination groups had the highest mean shear bond strength, no statistically significant differences were found among the groups. All failures were adhesive in nature.
Conclusions: Within the limitations of this in vitro study, internal bleaching with 35% hydrogen peroxide reduces dentin microhardness. Application of CPP-ACP, either alone or combined with calcium hydroxide after bleaching, effectively restore dentin microhard without adversely affecting the shear bond strength of composite resin to dentin.
Materials & Method: In this study, 24 sound extracted human premolare teeth were collected and sectioned buccolingually, yielding a total of 48 dentin specimens. baseline microhardnes was recorded in the designated area. Subsequently, internal bleaching was performed in the same region, and the specimens were incubated for 5 days. post-bleaching microhardness was recorded. The specimens were randomly divided into four group: control, calcium hydroxide, CPP-ACP, and a combination of CPP-ACP and calcium hydroxide. The samples were incubated for one week, after which final microhardness measurements were obtained. Composites resin was then bonded to the dentin surface using a cylindrical plastic mold with a standardized cross-sectional dimension and a height of 3 mm. Shear bond strength and failure modes were recorded by observation under a stereomicroscope.
Results: Internal bleaching with 35% hydrogen peroxide significantly decrease dentin microhardness in all specimen. Following application of the tested materials, statistically significant differences were observed among the group, with the control group showing the lowest microhardness values. Significant increases in microhardness were found in the CPP-ACP and CPP-ACP + calcium hydroxide groups, with the highest values recorded in the combination group. Although the combination groups had the highest mean shear bond strength, no statistically significant differences were found among the groups. All failures were adhesive in nature.
Conclusions: Within the limitations of this in vitro study, internal bleaching with 35% hydrogen peroxide reduces dentin microhardness. Application of CPP-ACP, either alone or combined with calcium hydroxide after bleaching, effectively restore dentin microhard without adversely affecting the shear bond strength of composite resin to dentin.
Keywords: Calcium Phosphates, Casein, Dentin, Hydrogen Peroxides, Calcium Hydroxide, tooth Remineralization, Tooth bleaching
Type of Study: Research Paper |
Subject:
Restorative Dentistry
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