Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time

Soo-Kyung Cho; Dong-Jun Kim; Yun-Chan Hwang; Won-Mann Oh; In-Nam Hwang

doi:10.5395/JKACD.2005.30.2.128

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Original Article Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time: Soo-Kyung Cho, Dong-Jun Kim, Yun-Chan Hwang, Won-Mann Oh, In-Nam Hwang; Journal of Korean Academy of Conservative Dentistry 2005;30(2):128-137.
DOI: https://doi.org/10.5395/JKACD.2005.30.2.128
Published online: March 31, 2005

Department of Conservative Dentistry, College of Dentistry, DSRI, Chonnam National University, Korea.

Corresponding author: In-Nam Hwang. Department of Conservative Dentistry, College of Dentistry, Chonnam National University, 8 Hak-dong, Dong-gu, Gwangju, Korea, 501-757. Tel: 82-62-220-4443, Fax: 82-62-225-8387, hinso@jnu.ac.kr

• Received: September 6, 2004 • Revised: November 18, 2004 • Accepted: November 23, 2004

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Abstract
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Abstract

In this study we measured the amount of light energy that was projected through the tooth material and analyzed the degree of polymerization by measuring the surface hardness of composites. For polymerization, Optilux 501 (Demetron, USA) with two types of light guide was used: a 12 mm diameter light guide with 840 mW/cm² light intensity and a 7 mm diameter turbo light guide with 1100 mW/cm².

Specimens were divided into three groups according to thickness of penetrating tooth (1 mm, 2 mm, 0 mm). Each group was further divided into four subgroups according to type of light guide and curing time (20 seconds, 40 seconds). Vickers'hardness was measured by using a microhardness tester. In 0 mm and 1 mm penetrating tooth group, which were polymerized by a turbo light guide for 40 seconds, showed the highest hardness values. The specimens from 2 mm penetrating tooth group, which were polymerized for 20 seconds, demonstrated the lowest hardness regardless of the types of light guides (p < 0.05).

The results of this study suggest that, when projecting tooth material over a specified thickness, the increase of polymerization will be limited even if light intensity or curing time is increased.
Keywords: Polymerization rate; Vickers' hardness; Thickness of tooth structure

REFERENCES

1. Roh BD, Park SH, Lee CS. An experimental study of the degree of conversion and cytotoxicity of dual cure resin cements. J Korean Acad Conserv Dent. 1995;20: 33-54.
2. Ferracane JL. Correlation between hardness and degree of conversion during the setting reaction of unfilled dental restorative resins. Dent Mater. 1985;1: 11-14.Article PubMed
3. Peutzfeldt A, Asmussen E. Hardness of restorative resins: effect of camphoroquinone, amine, and inhibitor. Acta Odontol Scand. 1989;47: 229-231.PubMed
4. Asmussen E. Restorative resins: hardness and strength vs quantity of remaining double bonds. Scand J Dent Res. 1982;90: 484-489.Article PubMed
5. Pearson GJ, Longman CM. Water sorption and solubility of resin-based materials following inadequate polymerization by a visible-light curing system. J Oral Rehabil. 1989;16: 57-61.Article PubMed
6. Ruyter IE, Oysaed H. Compressive creep of light cured resin based restorative materials. Acta Odontol Scand. 1982;40: 319-324.Article PubMed
7. Bayne SC, Heymann HO, Swift EJ. Update on dental composite restorations. J Am Dent Assoc. 1994;125: 687-701.Article PubMed
8. Eakle WS. Fracture resistance of teeth restored with class II bonded composite resin. J Dent Res. 1986;65: 149-153.Article PubMed PDF
9. Fujisawa S, Imai Y, Kojima K, Masuhara E. Studies on hemolytic activity of bisphenol A diglycidyl methacrylate (Bis-GMA). J Dent Res. 1978;57: 98-102.Article PubMed PDF
10. Fujisawa S, Kadoma Y, Masuhara E. Action of drugs, detergents and monomers on liposomes. J Dent Res. 1982;61(10):1206-1210.Article PubMed PDF
11. Yang HS, Park YJ. The effect of composition on the mechanical properties of composite resin. J Korean Dent Assoc. 1989;27: 185-199.
12. Inoue K, Hayashi I. Residual monomer (Bis-GMA) of composite resins. J Oral Rehabil. 1982;9: 493-497.Article PubMed
13. Youngson CC, Glyn Jhones JC, Fox K, Smith IS, Wood DJ, Gale M. A fluid filtration and clearing technique to assess microleakage associated with three dentin bonding systems. J Dent. 1999;27: 223-233.PubMed
14. Tsunekawa M, Setcods JC, Usami Y, Iwaku M, Marshall SJ. A new light-activated adhesive composite: shear bond strength and microleakage. Dent Mater. 1992;8: 234-237.Article PubMed
15. Kim KH, Kwon OS, Kim HG, Baek KC, Um CM, Kwon HC. A study on the degree of conversion of light curing composite resin according to the depth of cure and light curing time. J Korean Acad Conserv Dent. 1997;22(1):35-55.
16. Asmussen E. Factors affecting the quantity of remaining double in restorative resin polymers. Scand J Dent Res. 1982;90: 490-496.PubMed
17. Ruyter IE, Oysaed H. Conversion in different depths of ultraviolet and visible light activated composite materials. Acta Odontol Scand. 1982;40: 179-192.Article PubMed
18. Cook WD. Spectral distributions of dental photopolymerization sources. J Dent Res. 1982;61: 1436-1438.Article PubMed PDF
19. Manga RK, Charlton DG, Wakefield CW. In vitro evaluation of a curing radiometer as a predictor of polymerization depth. Gen Dent. 1995;43: 241-243.PubMed
20. Rueggeberg FA, Caughman WF, Curtis JW. Effect of light intensity and exposure duration on cure of resin composite. Oper Dent. 1994;19: 26-32.PubMed
21. Swartz ML, Phillips RW, Rhodes B. Visible light-activated resins-Depth of cure. J Am Dent Assoc. 1983;106: 634-637.Article PubMed
22. Hwang KH, Jang IH, Lee SJ, Lee KW. A study on the degree of conversion of light curing composite resin according to the thickness of tooth structure penetrated by light and applied light curing time. J Korean Acad Conserv Dent. 2002;27: 16-23.Article
23. Jordan R. Esthetic composite bonding, technique and materials. 2nd ed. Mosby Year Book; 20.
24. Pires JA, Cvitko E, Denehy G, Swift EJ. Effects of curing tip distance on light intensity and composite resin microhardness. Quintessence Int. 1993;24: 517-521.PubMed
25. Vankerckhoven H, Lambrechts P, Beylen MV, Davidson CL, Vanherle G. Unreacted methacrylate groups on the surfaces of composite resins. J Dent Res. 1982;61(6):791-795.Article PubMed PDF
26. Davidson-Kaban SS, Davidson CL, Feilzer AJ, De gee AJ, Erdilek N. The effect of curing light variations on bulk curing and wall-to-wall quality of two types and various shades of resin composites. Dent Mater. 1997;13: 344-352.Article PubMed
27. Vargas NA, Cobb DS, Schmit JL. Polymerization of composite resins: Argon laser vs conventional light. Oper Dent. 1998;23: 87-93.PubMed
28. Tanoue N, Matsumura H, Atsuta M. Curing depth of prosthetic composite materials polymerized with their proprietary photo-curing units. J Oral Rehabil. 1999;26: 594-599.Article PubMed
29. Kawaguchi M, Fukushima T, Miyazaki K. The relationship between cure depth and transmission coeffecient of visible-light-activated resin composites. J Dent Res. 1994;73(2):516-521.Article PubMed PDF
30. Chung KH. The relationship between composition and properties of posterior resin composites. J Dent Res. 1990;69(3):852-856.Article PubMed PDF
31. Pilo R, Cardash HS. Post-irradiation Polymerization of different anterior and posterior visible light-activated resin composites. Dent Mater. 1992;8: 299-304.Article PubMed
32. Wassell RW, McCsbe JF, Walls AW. Subsurface deformation associated with hardness measurements of composites. Dent Mater. 1992;8: 218-223.Article PubMed
33. Jandt KD, Mills RW, Blackwel GB, Ashworth SH. Depth of cure and compressive strength of dental composites cured with blue light emitting diodes(LEDs). Dent Mater. 2000;16: 41-47.Article PubMed
34. Harrington E, Wilson HJ. Depth of cure of radiation-activated materials. Effect of mould material and cavity size. J Dent. 1993;21: 305-311.Article PubMed
35. Curing Radiometer operating instructions. 1990;Danbury, CT: Demetron Research.
36. An MK, Jung TS, Kim S. A study on the changes in polymerization of light-activated composite resin with various exposure time and distance. J Korean Acad Pediatr Dent. 2001;28: 293-297.
37. Price RB, Murphy DG, Derand T. Light energy transmission through cured resin composite and human dentin. Quintessence Int. 2000;31: 659-667.PubMed
38. Vogel K, Salz U. Influence of trans-tooth curing on physical properties of composites [abstract(3)]. J Dent Res. 1997;76: 1111.
39. Nomoto R, Uchida K, Hirasawa T. Effect of light intensity on polymerization of light-cured composite resins. Dent Mater J. 1994;13: 198-205.Article PubMed
40. Rueggeberg FA, Craig RG. Correlation of parameters used to estimate monomer conversion in a light-cured composite. J Dent Res. 1988;67: 932-937.Article PubMed PDF
41. Prati C, Chersoni S, Montebugnoli L, Montanari G. Effect of air, dentin and resin-based composite thickness on light intensity reduction. Am J Dent. 1999;12: 231-234.PubMed
42. Chan KC, Boyer DB. Curing light-activated composite resins through dentin. J Prosthet Dent. 1985;54(5):643-645.Article PubMed
43. Uno S, Asmussen E. Effect on bonding of curing through dentin. Acta odontol Scand. 1991;49: 317-320.Article PubMed
44. Ruyter IE, Vanherle G, Smith DC. Monomer systems and polymerization In posterior composite resin dental restorative materials. 1985;Peter Szulc Publishing Co.; 109-126.
45. Grassie N. Chemistry of high polymer degradation process. 1956;Butter worth pub; 255.
46. Choi KK, Min BS. Quantitative analysis of residual monomers in visible light-cured resins. J Korean Acad Conserv Dent. 1992;17: 181-189.
47. Antonucci JM. New monomers for use in dentistry. Biomedical and dental application of dental polymers. 357-371.Article
48. Rueggeberg FA, Margeson DS. The effect of oxygen inhibition on an unfilled/filled composite system. J Dent Res. 1990;69: 1652-1658.Article PubMed PDF
49. Shortall AC, Wilson HJ, Harrington E. Depth of cure of radiation-activated composite restorations-influence of shade and opacity. J Oral Rehabil. 1995;22: 337-342.PubMed

Figure 1

Schematic drawing of specimen fabrication.

Figure 2

Vickers' hardness number of all specimens.

Figure 3

Vickers' hardness of resin composites cured by Turbo-light guide.

Figure 4

Vickers' hardness of resin composites cured by 12 mm diameter light guide.

Figure 5

Ratio of Vickers' hardness by thickness of tooth structure.

Table 1

Groups were divided according to the thickness of tooth specimen, used light guide, curing time.

Table 2

Vickers' hardness of the tested resin composites

Tables & Figures

REFERENCES

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Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time

J Korean Acad Conserv Dent. 2005;30(2):128-137. Published online March 31, 2005

DOI: https://doi.org/10.5395/JKACD.2005.30.2.128

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Figure

Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time

Figure 1 Schematic drawing of specimen fabrication.

Figure 2 Vickers' hardness number of all specimens.

Figure 3 Vickers' hardness of resin composites cured by Turbo-light guide.

Figure 4 Vickers' hardness of resin composites cured by 12 mm diameter light guide.

Figure 5 Ratio of Vickers' hardness by thickness of tooth structure.

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Surface hardness of the dental composite cured by light that penetrate tooth structure according to thickness of tooth structure, light intensity and curing time

Table 1

Groups were divided according to the thickness of tooth specimen, used light guide, curing time.

Table 2

Vickers' hardness of the tested resin composites

Table 1 Groups were divided according to the thickness of tooth specimen, used light guide, curing time.

Table 2 Vickers' hardness of the tested resin composites