The Effect of Hydroxyapatite from Various Toothpastes on Tooth Enamel

The process of re-demineralisation is governed by the degree of mineral saturation of oral fluids. Due to positive changes in conditions, remineralisation can become the predominant process leading to the healing of injuries. To improve remineralisation, it is necessary to increase the concentration of calcium and fluoride in oral fluids. For this purpose, fluorides have traditionally been used in varied forms and concurrently, the cariostatic mechanism can be explained by increasing the force of fluorapatites. The aim of this paper was to demonstrate the importance of using toothpastes containing hydroxyapatite on tooth enamel and how to operate at microscopic level by sealing the enamel and enamel prism defects etched by acid. The specimens obtained from extracted teeth were treated with different types of toothpastes containing hydroxyapatite: Biorepair, Sensodyne Repair & Protect and Lacalut White & Repair. We treated the teeth with the aforementioned toothpastes, followed the study under SEM microscope. We compared the control sample with the treated sample, and then the treated samples were compared to each other. All three toothpastes used had the expected result, making a protective layer on the surface of the etched enamel, but in this study, the Sensodyne toothpaste seems to be the most effective.

Sea otter dental enamel is highly resistant to chipping due to its microstructure

Dental enamel is prone to damage by chipping with large hard objects at forces that depend on chip size and enamel toughness. Experiments on modern human teeth have suggested that some ante-mortem chips on fossil hominin enamel were produced by bite forces near physiological maxima. Here, we show that equivalent chips in sea otter enamel require even higher forces than human enamel. Increased fracture resistance correlates with more intense enamel prism decussation, often seen also in some fossil hominins. It is possible therefore that enamel chips in such hominins may have formed at even greater forces than currently envisaged.

Relationship between Fluor Concentration and Structure Pattern of Enamel Prism in Enamel Surface after Coffee and Black Tea Exposure

ABSTRACT Coffee and tea are often consumed by Indonesian and Aceh people. Based on previous research reported that concentration of fluor in coffee and tea affects pattern structure of enamel prism. Currently, little explanation about relationship between fluor concentrations and pattern structure of enamel prism in enamel surface after coffee and tea drinking water exposure. The purpose of this study is to explain relationship between fluor concentrations and pattern structure of enamel prism in enamel surface after coffee and tea drinking water exposure. Materials and methods Eight maxillary premolars were divided into control and treatment group. Positive control group exposure to NaCl 0.9%, negative control group exposure to sulfuric acid 50%, treatment groups are exposure to coffee and tea drinking water. This study conducted by scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX). Data analysis is descriptive qualitative. Results Fluor in tea increases the density of the enamel prism structure pattern. Surface enamel that exposed to tea has described better arrangement of enamel prism pattern than enamel surface that exposed to coffee. Conclusion Fluor concentration in drinking water has relationship with structure patterns of enamel prism. The structure patterns of enamel prism that exposed to tea have better arrangement than enamel that exposed to coffee. How to cite this article Nasution AI, Gani BA, Pospos RM. Relationship between Fluor Concentration and Structure Pattern of Enamel Prism in Enamel Surface after Coffee and Black Tea Exposure. World J Dent 2012;3(4):284-289.