Changes in surface content and crystal structure after fluoride gel or hydroxyapatite paste application on stripped enamel

Sang-Cheol Kim; Hyun-Sil Hong; Young-Cheol Hwang

doi:10.4041/kjod.2008.38.6.407

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Kim, Hong, and Hwang: Changes in surface content and crystal structure after fluoride gel or hydroxyapatite paste application on stripped enamel

Original Article

Korean Journal of Orthodontics

Korean Journal of Orthodontics 2008; 38(6): 407-415.

Published online: 31 December 2008

DOI: https://doi.org/10.4041/kjod.2008.38.6.407

Changes in surface content and crystal structure after fluoride gel or hydroxyapatite paste application on stripped enamel

Sang-Cheol Kim, DDS, MSD, PhD^a, Hyun-Sil Hong, DDS, MSD^b, Young-Cheol Hwang, DDS, MSD^b

^aProfessor, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.

^bGraduate student, Department of Orthodontics, School of Dentistry, Wonkwang University, Korea.

Corresponding author: Sang-Cheol Kim. Department of Orthodontics, School of Dentistry, Wonkwang University, 344-2, Shinyong-dong, Iksan 570-749, Korea. +82 63 859 2960; sangkim@wku.ac.kr

Received 4 February 2008 Revised 23 October 2008 Accepted 27 October 2008

Abstract

Objective

The aim of this study was to evaluate the remineralization of interdentally stripped teeth after fluoride gel or hydroxyapatite paste application.

Methods

After interdental stripping, 1.23% fluoride gel or 10% hydroxyapatite paste was applied three times a day, with a duration of four minutes, for a week. Scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS) were used to compare the change of surface contents and crystal structures before and after the application of fluoride gel or hydroxyapatite paste.

Results

EDS analysis indicated that calcium contents were increased after 10% HAp paste application on stripped enamel (p < 0.01). SEM view showed that enamel surfaces in groups of 1.23% APF gel or 10% HAp paste application were smoother than those of control group, which was regarded as filling of the pore structure. And pores between crystal structures in groups treated with 1.23% APF gel or 10% HAp paste were smaller than those of control group.

Conclusions

Application of APF or HAp on stripped enamel could positively influence on the surface contents or crystal structure.

Keywords: EDS, Enamel stripping, Remineralization, Surface contents of enamel, Crystal structure of enamel

Figures and Tables

Fig 1

Surface appearance change of stripped enamel 7 days after acidulated phosphate fluoride (APF) gel application (SEM micrograph, × 250). A, Stripped enamel; B, 7 days after 1.23% APF gel application.

Fig 2

Crystal structure change of stripped enamel 7 days after acidulated phosphate fluoride (APF) gel application (SEM micrograph, × 50 k). A, Stripped enamel; B, 7 days after 1.23% APF gel application.

Fig 3

Surface appearance change of stripped enamel 7 days after 10% hydroxy apatite (HAp) paste application (SEM micrograph, × 250). A, Stripped enamel; B, 7 days after 10% HAp paste application.

Fig 4

Crystal structure change of stripped enamel 7 days after 10% hydroxy apatite (HAp) paste application (SEM micrograph, × 50 k). A, Stripped enamel; B, 7 days after 10% HAp paste application.

Fig 5

Quantitative evaluation of the enamel surface by energy dispersive X-ray spectroscopy (EDS).

Table 1

Mineral content change (weight %) of stripped enamel 7 days after acidulated phosphate fluoride (APF) gel application

Table 2

Mineral content change (weight %) of stripped enamel 7 days after hydroxy apatite (HAp) paste application

Statistal significance by paired t-test (p < 0.01).

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