SURFACE COMPOSITION AND NANO-MECHANICAL PROPERTIES OF HUMAN ENAMEL BRUSHED WITH TOOTHPASTE STANDARDIZED BY 10 WT % NANO-HYDROXYAPATITE
Abdel-Hamid, D., El-Dokky, N., El-Tawil, S. (2017). SURFACE COMPOSITION AND NANO-MECHANICAL PROPERTIES OF HUMAN ENAMEL BRUSHED WITH TOOTHPASTE STANDARDIZED BY 10 WT % NANO-HYDROXYAPATITE. EKB Journal Management System, 63(Issue 3 - July (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)), 2607-2617. doi: 10.21608/edj.2017.76212
Dalia M Abdel-Hamid; Norhan A El-Dokky; Sherif B El-Tawil. "SURFACE COMPOSITION AND NANO-MECHANICAL PROPERTIES OF HUMAN ENAMEL BRUSHED WITH TOOTHPASTE STANDARDIZED BY 10 WT % NANO-HYDROXYAPATITE". EKB Journal Management System, 63, Issue 3 - July (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), 2017, 2607-2617. doi: 10.21608/edj.2017.76212
Abdel-Hamid, D., El-Dokky, N., El-Tawil, S. (2017). 'SURFACE COMPOSITION AND NANO-MECHANICAL PROPERTIES OF HUMAN ENAMEL BRUSHED WITH TOOTHPASTE STANDARDIZED BY 10 WT % NANO-HYDROXYAPATITE', EKB Journal Management System, 63(Issue 3 - July (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)), pp. 2607-2617. doi: 10.21608/edj.2017.76212
Abdel-Hamid, D., El-Dokky, N., El-Tawil, S. SURFACE COMPOSITION AND NANO-MECHANICAL PROPERTIES OF HUMAN ENAMEL BRUSHED WITH TOOTHPASTE STANDARDIZED BY 10 WT % NANO-HYDROXYAPATITE. EKB Journal Management System, 2017; 63(Issue 3 - July (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics)): 2607-2617. doi: 10.21608/edj.2017.76212

SURFACE COMPOSITION AND NANO-MECHANICAL PROPERTIES OF HUMAN ENAMEL BRUSHED WITH TOOTHPASTE STANDARDIZED BY 10 WT % NANO-HYDROXYAPATITE

Egyptian Dental Journal
Article 17, Volume 63, Issue 3 - July (Fixed Prosthodontics, Dental Materials, Conservative Dentistry & Endodontics), July 2017, Page 2607-2617  XML PDF (1.59 MB)
Document Type: Original Article
DOI: 10.21608/edj.2017.76212
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Authors
Dalia M Abdel-Hamid1; Norhan A El-Dokky2; Sherif B El-Tawil2
1Assistant Professor of Dental Materials Science, Biomaterials Department, Faculty of Dentistry, Cairo University, Egypt.
2Assistant Professor of Pedodontics, Pediatric and Community Dentistry Department, Faculty of Dentistry, Cairo University, Egypt
Abstract
Purpose: Evaluation of the effect of simulated brushing with toothpaste standardized by 10 wt. % nano-hydroxyapatite (n-HAp) for one year on the surface composition and nano-mechanical properties (hardness and elastic modulus) of human enamel.
Study design: 20 sliced human enamel/dentin slabs were divided into: control group (brushed with a commercial toothpaste) and test group (brushed with the same toothpaste with 10 wt. % n-HAp ~20 nm). Brushing was performed for one hour/day for 24 days. The nano-hardness and elastic modulus were measured (GPa) by the nano-indenter. SEM and EDXA were performed to study the morphology, thickness and the chemical composition of enamel surface. The Ca/P ratio was calculated (at. %). The data were statistically analyzed.
Results: Insignificant difference (P = 0.070) between the nanohardness values of the 2 groups was obtained. However, the elastic modulus of the control group was significantly lower than that of the test group (P = 0.019). SEM of the test group revealed the precipitation of n-HAp layer (~5 µm thick). The Ca/P ratios and the other minerals of the two groups were not significantly different.
Conclusions: Using dental products containing ≥10 wt. % n-AHp should be restricted to patients susceptible to demineralization; to avoid their detrimental effect on the elastic modulus that could be negatively reflected clinically on the mechanical behavior of the teeth.
Keywords
Surface composition; Nano-mechanical; enamel; nano-hydroxyapatite; Brushing; Toothpaste
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