J Korean Acad Conserv Dent.  2002 Jul;27(4):403-410. 10.5395/JKACD.2002.27.4.403.

Microhardness and microleakage of composite resin cured by visible light with various band of wavelength

• Park SM
• Lee JY
• Han SR
• Ha SY
• Shin DH

• KMID: 1987296
• DOI: http://doi.org/10.5395/JKACD.2002.27.4.403

Abstract

Several ways of curing are being tried to improve material's properties and reduce marginal gap. However, all are considering about the pattern of light intensity. It was noted from the preliminary study the change of light wavelength from filter changing may give an impact on material's property and microleakage. The object of this study was to verify the effect of filters with various wavelength width on the microhardness and microleakage of composite resin; hybrid type of DenFil and submicron hybrid type of Esthet X. Composite resins were cured using 3 kinds of filter; narrow-banded(465-475 nm), mid-banded(430-470 nm), wide-banded(400-500 nm). After the estimation of microhardness, degree of dye penetration and the maximum gap from SEM evaluation were done between 4 groups that showed no difference in microhardness value of the lower surface. The results were as follows: 1. Adequate microhardness could not be gained with a narrow-banded filter irrespective of curing time. At the upper surface, DenFil should be polymerized with middle or wide-banded filter for 20 seconds at least, while Esthet X be cured with middle or wide-banded filter for 30 seconds at least to get similar hardness value to control group. 2. There was little dye penetration in enamel margin, but all dentin margins showed much more dye penetration irrespective of curing conditions. Although there was no statistical difference, groups cured with mid-banded filter for 40 seconds and with wide-width filter for 20 seconds showed relatively less dye penetration. 3. It was revealed from the SEM examination that group cured with wide-banded filter had the smallest gap without statistical significance. Spearman's rho test showed that the correlation between the results of dye penetration and SEM examination was very low. From these results, it could be concluded that curing with wide-width filter would be better than the other techniques, even though the curing technique using mid-width filter seems to have its own unique advantage.

Keyword

Microhardness; Microleakage; Wavelength width; Filter; Curing

MeSH Terms

Chimera
Composite Resins
Dental Enamel
Dentin
Hardness
Imidazoles
Light
Nitro Compounds
Polymers
Composite Resins
Imidazoles
Nitro Compounds
Polymers

Reference

References

1. Pradhan RD, Melikechi N, Eichmiller F. The effect of irradiation wavelength bandwidth and spot size on the scraping depth and temperature rise in composite exposed to an argon laser or a conventional quartz-tungsten-halogen source. Dent Mat. 2002 May; 18(3):221–226.

2. Cook WD. Spectral distribution of dental photopoly-merizing sources. J Dent Res. 1982; 61(12):1436–1438.

3. Davidson CL, de Gee AJ, Feilzer A. The competition between the composite-dentin bond strength and the polymerization contraction stress. J Dent Res. 1984; 63(12):1396–1399.

4. Davidson CL, de Gee AJ. Relaxation of polymerization contraction stresses by flow in dental composites. J Dent Res. 1984; 63:146–148.

5. Tarle Z, Meniga A, Ristic M, Sutalo J, Pichler G, Davidson CL. The effect of the polymerization method on the quality of composite resin samples. J Oral Rehabil. 1998; 25(6):436–442.

6. Lutz F, Kreejei I, Luescher B, Oldenburg TR. Improved proximal margin adaptation of Class II composite restorations by use of light-reflecting wedges. Quintessence Int. 1986; 17:659–670.

7. Chan KC, Boyer DB. Curing light activated composite resin through dentin. J Pros Dent. 1985; 54:643–645.

8. Mehl A, Hickel R, Kunzelmann KH. Physical properties and gap formation of light-cured composites with and without‘soft-start polymerization’. J Dent Res. 1997 May-Jul; 25(3-4):321–330.

9. Friedl KH, Schmalz G, Hiller KA, Markl A. Marginal adaption of Class V restorations with and without “soft-start polymerization”. Oper Dent. 2000 Jan-Feb; 25(1):26–32.

10. Goracci G, Mori G, Casa de’Martinis L. Curing light intensity and marginal leakage of resin composite restorations. Quint Int. 1996; 27:355–362.

11. Suh BI, Cripe CA, Yin R. Light intensity and exposure time effects on light cured composites. J Dent Res. 1998; 77:Special issue B:Abst, No. #73.

12. Dennison JB, Yaman P, Seir R, Hamilton JC. Effect of variable light intensity on composite shrinkage. J Pros Dent. 2000; 84(5):499–505.

13. Kim HC, Cho KM, Shin DH. Microhardness of esthetic restorative materials cured by 3 types of narrow-banded wavelength. J Korean Academy of Conservative Dentistry. 2001; 26(2):127–133.

14. Manhart J, Chen HY, Mehl A, Weber K, Hickel R. Marginal quality and microleakage of adhesive class V restorations. J Dent. 2001; 29:123–130.

15. Sakaguchi RL, Sasik CT, Bunczak MA, Douglas WH. Strain gauge method for measuring polymerization contraction of composite restoratives. J Dent. 1991 Oct; 19(5):312–326.

16. Ruggeberg FA. Effect of light-tip distance on polymerization of resin composite. Int J Prostho. 1993; 6:364–370.

17. Davidson CL, Feilzer AJ. Polymerization shrinkage and polymerization shrinkage stress in polymer-based restoratives. J Dent. 1997 Nov; 25(6):435–440.

18. Rueggeberg FA, Caughman WF, Curtis JW Jr, Davis HC. Factors affecting cure at depths within light-activated resin composites. Am J Dent. 1993; 6(2):91–95.

19. Bayne SC, Taylor DF. Dental materials. Sturdevant CM, Roberson TM, Heymann HO, Sturdevant Jr eds , editors. The art and sciences of operative dentistry. 1995. 3rd ed.St. Louis: Mosby;260.

20. Park SM, Shin DH. Microhardness and microleakage of composite resin according to the change of curing light intensity. J Korean Academy of Conservative Dentistry. 2001; 26(5):363–371.

21. Ruggeberg FA. Factors affecting light transmission of single use, plastic light-curing tips. Oper Dent. 1998 Jul; 23(4):145–152.

22. Goracci G, Mori G. Esthetic and functional reproduction of occlusal morphology with composite resins. Compend Contin Educ Dent. 1999 Jul; 20(7):643–648.

23. Burgess JO, DeGoes M, Walker R, Ripps AH. An evaluation of four light-curing units comparing soft and hard curing. Pract Periodont Aesthet Dent. 1999 Jan; 11(1):125–132.

24. Uno S, Asmussen E. Marginal adaptation of a restorative resin polymerized at reduced rate. Scand J of Dent Res. 1991; 99:440–444.

25. Unterbrink GL, Muessner R. Influence of light intensity on two restorative systems. J Dent. 1995 Jun; 23(3):183–189.

26. Manabe A, Debari K, Itoh K, Hisamitsu H, Wakumoto S. Effect of delayed light curing of a resin composite on marginal integrity in cylindrical dentine cavities. J Dent. 1993 Dec; 21(6):344–349.

27. Friedl KH, Schmalz G, Hiller KA, M rkl A. Marginal adaptation of class V restorations with and without “softstart-polymerization”. Oper Dent. 2000; 25:26–32.

28. Nomoto R. Effect of light wavelength on polymerization of light-cured resins. Dent Mater. 1997 Jun; 16(1):60–73.

29. Blankenau EK. Wavelength and intensity of systems for visible light-curing composite resins: a comparison study. JADA. 1983; 106(4):471–474.

30. Iwami Y, Yamamoto H, Ebisu S. A new electrical method for detecting marginal leakage of in vitro resin restorations. J Dent. 2000; 28:241–247.

31. Santini A, Plasschaert AJM, Mitchell S. Effect of composite resin placement techniques on the microleakage of two self-etching dentin-bonding agents. Am J of Dent. 2001; 14(3):132–136.