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Basic Research
- Elemental analysis of the fluoride varnish effects on root caries initiation
- Se-Eun Park, Keewook Yi, Hae-Young Kim, Ho-Hyun Son, Juhea Chang
- J Korean Acad Conserv Dent 2011;36(4):290-299. Published online July 31, 2011
- DOI: https://doi.org/10.5395/JKACD.2011.36.4.290
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Abstract
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ePub Objectives The usage of fluoride varnish for a moderate to low caries-risk group has not been well validated. This study aimed to evaluate the preventive and therapeutic efficacies of fluoride varnish on the initiated root caries.
Materials and Methods Ten premolars were sectioned into quarters, further divided into two windows, one of which was painted with Fluor Protector (1,000 ppm fluoride, Ivoclar Vivadent). An initial lesion with a well-preserved surface layer was produced by pH cycling. Scanned line analysis using energy dispersive spectrometry determined the weight percentages of Ca and P in the demineralized layer. Scanning Electron microscopy and confocal laser scanning microscopy (CLSM) evaluated the varnish-applied root surfaces.
Results The mean lesion depth (SD) was 12.3 (2.6) µm (single cycling) and 19.6 (3.8) µm (double cycling). Double cycling extended the lesion depth, but induced no more mineral loss than single cycling (
p < 0.05). The mean weight percentages of Ca and P between groups with and without varnish were not significantly different (p < 0.05). A CLSM showed varnish remained within 15 µm of the surface layer.Conclusions When a mild acid challenge initiated root tissue demineralization, the application of low-concentration fluoride varnish did not influence the lesion depth or the mineral composition of the subsurface lesion.
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Original Article
- A survey on the use of composite resin in Class II restoration in Korea
- Dong-Ho Shin, Se-Eun Park, In-Seok Yang, Juhea Chang, In-Bog Lee, Byeong-Hoon Cho, Ho-Hyun Son
- J Korean Acad Conserv Dent 2009;34(2):87-94. Published online March 31, 2009
- DOI: https://doi.org/10.5395/JKACD.2009.34.2.087
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Abstract
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The purpose of this study was to assess the current materials, methods and difficulties according to the year of licence and educational background of Korean dentists in Class II direct composite resin restorations.
Total 17 questions were included in the questionnaire. Questions were broadly divided into two parts; first, operator's information, and second, the materials and methods used in Class II posterior composite restoration. The questionnaire was sent to dentists enrolled in Korean Dental Association via e-mail. Total 12,193 e-mails were distributed to dentists, 2,612 e-mails were opened, and 840 mails (32.2%) were received from respondents. The data was statically analyzed by chi-square test using SPSS(v. 12.0.1, SPSS Inc, Chicago, IL, USA).
Male dentists among respondents was 79%. 60.3% of the respondents acquired their licences recently (1998-2007), and 77% practiced in private offices. 83.4% have acquired their knowledge through school lectures, conferences and seminars.
For the Class II restorations, gold inlays were preferred by 65.7% of respondents, while direct composite resin restorations were used by 12.1% amalgam users were only 4.4% of respondents.
For the restorative technique, 74.4% of respondents didn't use rubber dam as needed. For the matrix, mylar strip (53.4%), metal matrix (33.8%) and Palodent system (6.5%) were used. 99.6% of respondents restored the Class II cavity by incremental layering.
Obtaining of the tight interproximal contact was considered as the most difficult procedure (57.2%) followed by field isolation (21%).
Among various bonding systems, 22.6% of respondents preferred SE Bond and 20.2% used Single Bond. Z-250 was used most frequently among a variety of composite resins.
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