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CC BY-NC-ND 4.0 · Eur J Dent 2010; 04(04): 440-446
DOI: 10.1055/s-0039-1697864
Original Article
European Journal of Dentistry

The Effect of Irradiation Distance on Microhardness of Resin Composites Cured with Different Light Curing Units

Isil Cekic-Nagas
a   Dental School of Technology, Hacettepe University, Ankara, Turkey
,
Ferhan Egilmez
b   Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey
,
Gulfem Ergun
c   Department of Prosthodontics, Faculty of Dentistry, Gazi University, Ankara, Turkey
› Author Affiliations
Further Information

Publication History

Publication Date:
30 September 2019 (online)

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Objectives: The aim of this study was to compare the microhardness of five different resin composites at different irradiation distances (2 mm and 9 mm) by using three light curing units (quartz tungsten halogen, light emitting diodes and plasma arc).

Methods: A total of 210 disc-shaped samples (2 mm height and 6 mm diameter) were prepared from different resin composites (Simile, Aelite Aesthetic Enamel, Clearfil AP-X, Grandio caps and Filtek Z250). Photoactivation was performed by using quartz tungsten halogen, light emitting diode and plasma arc curing units at two irradiation distances (2 mm and 9 mm). Then the samples (n=7/ per group) were stored dry in dark at 37°C for 24 h. The Vickers hardness test was performed on the resin composite layer with a microhardness tester (Shimadzu HMV). Data were statistically analyzed using nonparametric Kruskal Wallis and Mann-Whitney U tests.

Results: Statistical analysis revealed that the resin composite groups, the type of the light curing units and the irradiation distances have significant effects on the microhardness values (P<.05).

Conclusions: Light curing unit and irradiation distance are important factors to be considered for obtaining adequate microhardness of different resin composite groups. (Eur J Dent 2010;4:440-446)

Keywords

Irradiation distance - Light curing units - Microhardness - Resin composites
 

  • REFERENCES

  • 1 Aguiar FH, Braceiro AT, Ambrosano GM, Lovadino JR. Hardness and diametral tensile strength of a hybrid composite resin polymerized with different modes and immersed in ethanol or distilled water media. Dent Mater 2005; 21: 1098-1103
    CrossrefPubMedGoogle Scholar
  • 2 Neumann MG, Miranda JrWG, Schmitt CC, Rueggeberg FA, Correa IC. Molar extinction coefficients and the photon absorption efficiency of dental photoinitiators and light curing units. J Dent 2005; 33: 525-532
    CrossrefPubMedGoogle Scholar
  • 3 Silva ALF e, Pereira GD, Dias CT, Sartini LAPaulillo. Effect of the composite photoactivation mode on microtensile bond strength and Knoop microhardness. Dent Mater 2006; 22: 203-210
    CrossrefPubMedGoogle Scholar
  • 4 Papadogiannis DY, Lakes RS, Papadogiannis Y, Palaghias G. Helvatjoglu-Antoniades M. The effect of temperature on the viscoelastic properties of nano-hybrid composites. Dent Mater 2008; 24: 257-266
    CrossrefPubMedGoogle Scholar
  • 5 Peutzfeldt A. Resin composites in dentistry: the monomer systems. Eur J Oral Sci 1997; 105: 97-116
    CrossrefPubMedGoogle Scholar
  • 6 Beun S, Glorieux T, Devaux J, Vreven J, Leloup G. Characterization of nanofilled compared to universal and microfilled composites. Dent Mater 2007; 23: 51-59
    CrossrefPubMedGoogle Scholar
  • 7 Kim Y, Kim CK, Cho BH, Son HH, Um CM, Kim OY. A new resin matrix for dental composite having low volumetric shrinkage. J Biomed Mater Res B Appl Biomater 2004; 70: 82-90
    Google Scholar
  • 8 de RRMoraes, Ribeiro SDdos, Klumb MM, Brandt WC, Correr-Sobrinho L, Bueno M. In vitro toothbrushing abrasion of dental resin composites: packable, microhybrid, nanohybrid and microfilled materials. Braz Oral Res 2008; 22: 112-118
    CrossrefPubMedGoogle Scholar
  • 9 Aravamudhan K, Rakowski D, Fan PL. Variation of depth of cure and intensity with distance using LED curing lights. Dent Mater 2006; 22: 988-994
    CrossrefPubMedGoogle Scholar
  • 10 Santos JrGC, El-Mowafy O, Rubo JH, Santos MJ. Hardening of dual-cure resin cements and a resin composite restorative cured with QTH and LED curing units. J Can Dent Assoc 2004; 70: 323-328
    PubMedGoogle Scholar
  • 11 Jung H, Friedl KH, Hiller KA, Furch H, Bernhart S, Schmalz G. Polymerization efficiency of different photocuring units through ceramic discs. Oper Dent 2006; 31: 68-77
    CrossrefPubMedGoogle Scholar
  • 12 Leonard DL, Charlton DG, Roberts HW, Cohen ME. Polymerization efficiency of LED curing lights. J Esthet Restor Dent 2002; 14: 286-295
    CrossrefPubMedGoogle Scholar
  • 13 Fleming GJ, Khan S, Afzal O, Palin WM, Burke FJ. Investigation of polymerization shrinkage strain, associated cuspal movement and microleakage of MOD cavities restored incrementally with resin-based composite using an LED light curing unit. J Dent 2007; 35: 97-103
    CrossrefPubMedGoogle Scholar
  • 14 Jain P, Pershing A. Depth of cure and microleakage with high-intensity and ramped resin-based composite curing lights. J Am Dent Assoc 2003; 134: 1215-1223
    CrossrefPubMedGoogle Scholar
  • 15 Soares LE, Liporoni PC, Martin AA. The effect of soft-start polymerization by second generation LEDs on the degree of conversion of resin composite. Oper Dent 2007; 32: 160-165
    CrossrefPubMedGoogle Scholar
  • 16 Miranda CB, Pagani C, Bottino MC, Benetti AR. A comparison of microhardness of indirect composite restorative materials. J Appl Oral Sci 2003; 11: 157-161
    CrossrefPubMedGoogle Scholar
  • 17 Ceballos L, Fuentes VM, Tafalla H, Martínez A, Flores J, Rodríguez J. Curing effectiveness of resin composites at different exposure times using LED and halogen units. Med Oral Patol Oral Cir Bucal 2009; 14: E51-E56
    PubMedGoogle Scholar
  • 18 Rueggeberg FA, Caughman WF, Curtis Jr JW. Effect of light intensity and exposure duration on cure of resin composite. Oper Dent 1994; 19: 26-32
    PubMedGoogle Scholar
  • 19 Yazici AR, Müftü A, Kugel G. Temperature rise produced by different light-curing units through dentin. J Contemp Dent Pract 2007; 8: 21-28
    PubMedGoogle Scholar
  • 20 Thomé T, Steagall JrW, Tachibana A, Braga SR, Turbino ML. Influence of the distance of the curing light source and composite shade on hardness of two composites. J Appl Oral Sci 2007; 15: 486-491
    CrossrefPubMedGoogle Scholar
  • 21 Price RB, Felix CA, Andreou P. Effects of resin composite composition and irradiation distance on the performance of curing lights. Biomaterials 2004; 25: 4465-4477
    CrossrefPubMedGoogle Scholar
  • 22 David JR, Gomes OM, Gomes JC, Loguercio AD, Reis A. Effect of exposure time on curing efficiency of polymerizing units equipped with light-emitting diodes. J Oral Sci 2007; 49: 19-24
    CrossrefPubMedGoogle Scholar
  • 23 Bouschlicher MR, Rueggeberg FA, Wilson BM. Correlation of bottom-to-top surface microhardness and conversion ratios for a variety of resin composite compositions. Oper Dent 2004; 29: 698-704
    PubMedGoogle Scholar
  • 24 Reges RV, Moraes RR, Correr AB, Sinhoreti MA, Correr-Sobrinho L, Piva E, Nouer RP. In-depth polymerization of dual-cured resin cement assessed by hardness. J Biomater Appl 2008; 23: 85-96
    CrossrefPubMedGoogle Scholar
  • 25 Sinhoreti MA, Manetta IP, Tango RN, Iriyama NT, Consani RL, Correr-Sobrinho L. Effect of light-curing methods on resin cement Knoop hardness at different depths. Braz Dent J 2007; 18: 305-308
    PubMedGoogle Scholar
  • 26 Santos GB, Medeiros IS, Fellows CE, Muench A, Braga RR. Composite depth of cure obtained with QTH and LED units assessed by microhardness and micro-Raman spectroscopy. Oper Dent 2007; 32: 79-83
    CrossrefPubMedGoogle Scholar
  • 27 Kurachi C, Tuboy AM, Magalhães DV, Bagnato VS. Hardness evaluation of a dental composite polymerized with experimental LED-based devices. Dent Mater 2001; 17: 309-315
    CrossrefPubMedGoogle Scholar
  • 28 Oberholzer TG, Du ICPreez, Kidd M. Effect of LED curing on the microleakage, shear bond strength and surface hardness of a resin-based composite restoration. Biomaterials 2005; 26: 3981-3986
    CrossrefPubMedGoogle Scholar
  • 29 Bennett AW, Watts DC. Performance of two blue lightemitting-diode dental light curing units with distance and irradiation-time. Dent Mater 2004; 20: 72-79
    CrossrefPubMedGoogle Scholar
  • 30 Lohbauer U, Rahiotis C, Krämer N, Petschelt A, Eliades G. The effect of different light-curing units on fatigue behavior and degree of conversion of a resin composite. Dent Mater 2005; 2: 608-615
    Google Scholar
  • 31 Cekic I, Ergun G, Lassila LV, Vallittu PK. Ceramic-dentin bonding: effect of adhesive systems and light curing units. J Adhes Dent 2007; 9: 17-23
    PubMedGoogle Scholar
  • 32 Mobarak E, Elsayad I, Ibrahim M, El-Badrawy W. Effect of LED light-curing on the relative hardness of tooth-colored restorative materials. Oper Dent 2009; 34: 65-71
    CrossrefPubMedGoogle Scholar
  • 33 Peris AR, Mitsui FH, Amaral CM, Ambrosano GM, Pimenta LA. The effect of composite type on microhardness when using quartz-tungsten-halogen (QTH) or LED lights. Oper Dent 2005; 30: 649-654
    PubMedGoogle Scholar
  • 34 Mills RW, Uhl A, Blackwell GB, Jandt KD. High power light emitting diode (LED) arrays versus halogen light polymerization of oral biomaterials: Barcol hardness, compressive strength and radiometric properties. Biomaterials 2002; 23: 2955-2963
    CrossrefPubMedGoogle Scholar
  • 35 Alves EB, Alonso RC, Correr GM, Correr AB, de RRMoraes, Sinhoreti MA, Correr-Sobrinho L. Transdental photoactivation technique: hardness and marginal adaptation of composite restorations using different light sources. Oper Dent 2008; 33: 421-425
    CrossrefPubMedGoogle Scholar
  • 36 Sfondrini MF, Cacciafesta V, Scribante A, Boehme A, Jost-Brinkmann PG. Effect of light-tip distance on the shear bond strengths of resin-modified glass ionomer cured with high-intensity halogen light-emitting diode and plasma arc lights. Am J Orthod Dentofacial Orthop 2006; 129: 541-546
    CrossrefPubMedGoogle Scholar
  • 37 Caldas DB, de JBAlmeida, Correr-Sobrinho L, Sinhoreti MA, Consani S. Influence of curing tip distance on resin composite Knoop hardness number, using three different light curing units. Oper Dent 2003; 28: 315-320
    PubMedGoogle Scholar
  • 38 Mota EG, Oshima HM, Burnett JrLH, Pires LA, Rosa RS. Evaluation of diametral tensile strength and Knoop microhardness of five nanofilled composites in dentin and enamel shades. Stomatologija 2006; 8: 67-69
    PubMedGoogle Scholar
  • 39 Xu HH. Dental composite resins containing silica-fused ceramic single-crystalline whiskers with various filler levels. J Dent Res 1999; 78: 1304-1311
    Google Scholar