Effect Of Different Sodium Perborate Bleaching Agent Vehicles On Microhardness And Chemical Structure Of Human Dentin
Faten Mohamed Ahmed Ghonimy;
Abstract
The aim of this study was to evaluate the effect of sodium perborate bleaching agent mixed with different types of vehicles; distilled water, 30% hydrogen peroxide and 2% chlorohexidine gluconate gel on: Microhardness and chemical structure of human dentin.
A total of 90 human permanent anterior teeth randomly divided into two equal groups according to the methods of evaluation. Each group was further subdivided into three subgroups according to the vehicle being used with sodium perborate bleaching agent.
Samples were sectioned longitudinally mesiodestally and were horizontally embedded in auto-polymerized acrylic resin. One-half of each tooth was considered as an experimental half and the other half served as a control. The control halves were preoperatively evaluated for the microhardness and the inorganic chemical structure.
1. Evaluation of microhardness (Group I):
Coronal dentin microhardness was measured with Vicker’s Hardness Tester. The indentations were made on the mesial half of each sample after the first treatment period, and on the distal half after the second treatment period Measurements were taken at three different points for each sample on the coronal dentin and a mean was calculated to obtain one hardness value. Data was collected and statistically analysed.
2. Evaluation of inorganic chemical structure(Group II):
Samples were evaluated using a combined scanning electron microscope and energy dispersive X-ray spectrometry device. Area analysis was performed under vacuum on uncoated samples. Inorganic elements measurements were repeated, and the changes in mineral levels were recorded and scored qualitatively. Data was collected and statistically analyzed.
Results:
Results showed that sodium perborate increased the dentin microhardness when mixed with distlled water, 30% hydrogen peroxide and 2% chlorohexidine gluconate gel as a vehicle at the end of the last treatment period. No statistically significant difference was found between the three used vehicles. Oxygen, magnesium, Calcium and phosphorous weight percent showed no significant difference between the different used vehichles. However, Sodium weight percent increased significantly in distilled water group after the first treatment period. Sodium, Oxygen, Phosphorus and Calcium weight percent showed significant difference between the two treatment periods and the control group. While magnesium weight percent showed no significant difference at different treatment periods.
A total of 90 human permanent anterior teeth randomly divided into two equal groups according to the methods of evaluation. Each group was further subdivided into three subgroups according to the vehicle being used with sodium perborate bleaching agent.
Samples were sectioned longitudinally mesiodestally and were horizontally embedded in auto-polymerized acrylic resin. One-half of each tooth was considered as an experimental half and the other half served as a control. The control halves were preoperatively evaluated for the microhardness and the inorganic chemical structure.
1. Evaluation of microhardness (Group I):
Coronal dentin microhardness was measured with Vicker’s Hardness Tester. The indentations were made on the mesial half of each sample after the first treatment period, and on the distal half after the second treatment period Measurements were taken at three different points for each sample on the coronal dentin and a mean was calculated to obtain one hardness value. Data was collected and statistically analysed.
2. Evaluation of inorganic chemical structure(Group II):
Samples were evaluated using a combined scanning electron microscope and energy dispersive X-ray spectrometry device. Area analysis was performed under vacuum on uncoated samples. Inorganic elements measurements were repeated, and the changes in mineral levels were recorded and scored qualitatively. Data was collected and statistically analyzed.
Results:
Results showed that sodium perborate increased the dentin microhardness when mixed with distlled water, 30% hydrogen peroxide and 2% chlorohexidine gluconate gel as a vehicle at the end of the last treatment period. No statistically significant difference was found between the three used vehicles. Oxygen, magnesium, Calcium and phosphorous weight percent showed no significant difference between the different used vehichles. However, Sodium weight percent increased significantly in distilled water group after the first treatment period. Sodium, Oxygen, Phosphorus and Calcium weight percent showed significant difference between the two treatment periods and the control group. While magnesium weight percent showed no significant difference at different treatment periods.
Other data
| Title | Effect Of Different Sodium Perborate Bleaching Agent Vehicles On Microhardness And Chemical Structure Of Human Dentin | Other Titles | تأثيرالعوامل المحفزة المختلفة لبيربوراتي الصوديوم المبيضة على الصلابة والتركيب الكيميائي للعاج البشرى | Authors | Faten Mohamed Ahmed Ghonimy | Issue Date | 2015 |
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