EFFECT OF LIGHT CURING MODES ON POLYMERISATION SHRINKAGE AND MARGINAL INTEGRITY OF DIFFERENT FLOWABLE BULK-FILL COMPOSITES (IN VITRO STUDY)

Document Type : Original Article

Authors

1 Instructor at Restorative Dentistry Department, Faculty of Dentistry, Pharos University in Alexandria, Egypt.

2 Professor of Conservative Dentistry, Faculty of Dentistry, Alexandria University, Egypt.

3 Professor of Dental Biomaterials, Faculty of Dentistry, Alexandria University, Egypt.

Abstract

Introduction: Bulk-Fill flowable composites are low viscosity materials with reduced percentage of inorganic fillers, leading to more shrinkage but with minimal stress contraction, maintaining the marginal seal of the restoration.
Objectives: To evaluate the polymerization shrinkage and marginal integrity of two flowable bulk-fill composites cured by different light curing modes at different curing distances.
Materials and methods: Two types of flowable bulk-fill composites (Tetric EvoFlow, CLEARFIL AP-X Flow) were tested. For shrinkage test, 30 cylindrical specimens (5 mm diameter x 2 mm thickness) were prepared from each type of composite. For marginal integrity evaluation, 30 class II occluso-mesial cavities (3 mm width x 2.5 mm depth at the occlusal box and 3 mm width x 1.5 mm depth x 1 mm occluso-cervical height of the proximal box) were prepared and restored from each type of composite. The composites were cured using three LED light curing modes for 10 seconds (high mode at 1200 mW/cm2, low mode at 650 mW/cm2andsoft-start mode at 650 up to 1200 mW/cm2  for 5 seconds then at 1200 mW/cm2 for 5 seconds) at two curing distances (0 mm, 3 mm). Strain gauge was used to measure the shrinkage. Stereomicroscope was used to evaluate the microleakage and scanning electron microscope was used to measure the gap width. Data was analyzed using Mann-Whitney U, Kruskal-Wallis and Pearson’s Chi square tests.
Results: Tetric EvoFlow showed less marginal gap values than CLEARFIL AP-X Flow. Soft-start and high modes showed less microleakage and gap than low mode.0 mm distance showed less shrinkage and microleakage in soft-start and high modes than low mode. 3 mm distance showed less gap proximally in soft-start and low modes than high mode.
Conclusions: Different LED light curing modes and distances showed comparable results of shrinkage, microleakage and gap values for both composites tested.

Keywords

Main Subjects

References

1. Leprince JG, Palin WM, Vanacker J, Sabbagh J, Devaux J, Leloup G. Physicomechanical characteristics of commercially available bulk-fill composites. J Dent. 2014;42:993-1000. 
2. Shafiei F, Akbarian S. Microleakage of nanofilled resin modified glassionomer/silorane or methacrylate based composite sandwich Class II restoration: effect of simultaneous bonding. Oper Dent. 2014;39:22-30. 
3. Alvim HH, Alecio AC, Vasconcellos WA, Furlan M, de Oliveira JE, Saad JR. Analysis of camphorquinone in composite resins as a function of shade. Dent Mater. 2007;23:1245-9.
4. Watts D, Amer O, Combe E. Characteristics of visible light activated composite systems. Br Dent J. 1984;156:209-15. 
5. Hofman N, Hugo B, Klaiber B. Effect of irradiation type (LED or QTH) on photoactivated composite shrinkage strain, kinetics, temperature rise and hardness. Eur J Oral Sci. 2002;110:471-9. 
6. Alomari Q, Omar R, Akpata E. Effect of LED curing modes on postoperative sensitivity after Class II resin composite restorations. J Adhes Dent. 2007;9:477-81. 
7. Asmussen E, Peutzfeldt A. Two-step curing on conversion and softening of a dental polymer. Dent Mater. 2003;19:466-70. 
8. Thomé T, Steagall W Jr, 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;15:486–91. 
9. Dunne WJ, Bush AC. A comparison of polymerization by light-emitting diode and halogen-based light-curing units. J Am Dent Assoc. 2002;133:335-41. 
10. Soares CJ, Faria E-Silva AL, Rodrigues MP, Vilela ABF, Pfeifer CS, Tantbirojn D, et al. Polymerization shrinkage stress of composite resins and resin cements-What do we need to know? Braz Oral Res. 2017;31:62. 
11. Poggio C, Chiesa M, Scribante A, Mekler J, Colombo M. Microleakage in Class II composite restorations with margins below the CEJ: In vitro evaluation of different restorative techniques. Med Oral Patol Oral Cir Bucal. 2013;18:783-98. 
12. Sawani S, Arora V, Jaiswal S, Nikhil V. Comparative evaluation of microleakage in Class II restorations using open vs. closed centripetal build-up techniques with different lining materials. J Conserv Dent. 2014;17:344-8.
13. John NK, Manoj KV, Joseph B, Kuruvilla A, Faizal N, Babu BS. A comparative evaluation of the internal adaptation of various lining materials to dentin under light cure composite restorations: A scanning electron microscope study. J Int Oral Health. 2017;9:6-11. 
14. Weinmann W, Thalacker C, Guggenberger R. Siloranes in dental composites. Dent Mater. 2005;21:68-74. 
15. Gan JK, Yap AU, Cheong JW, Arista N, Tan C. Bulk-fill composites: effectiveness of cure with poly- and monowave curing lights and modes. J Oper Dent. 2018;43:136-43. 
16. Han B, Dong YM, Wang XY, Gao XJ. Effects of light-curing modes on the polymerization shrinkage and surface hardness of composite resins. Beijing Da Xue Xue Bao Yi Xue Ban. 2011;43:770-3. 
17. Oliveira KM, Lancellotti AC, Ccahuana-Vásquez RA, Consani S. Shrinkage stress and degree of conversion of a dental composite submitted to different activation protocols. Acta Odontol Latinoam. 2012;25:115-22. 
18. Chye CH, Yap AU, Laim YC, Soh MS. Post-gel polymerization shrinkage associated with different light curing regimens. Oper Dent. 2005;30:474-80. 
19. Ilie N, Keßler A, Durner J. Influence of various irradiation processes on the mechanical properties and polymerization kinetics of bulk-fill resin based composites. J Dent. 2013;41:695-702. 
20. Orłowski M, Tarczydło B, Chałas R. Evaluation of marginal integrity of four bulk-fill dental composite materials: In vitro study. ScientificWorldJournal. 2015;2015:701262. 
21. Davari A, Daneshkazemi A, Taghizadeh T. Effect of Three Light Curing Protocols and Load Cycling on Microleakage of Class V Composite Restorations. J Dent School. 2014;32:71-9
22. Santos AJ, Lisso MT, Aguair FH. Effect of stepped exposure of quantitative in vitro marginal microleakage. J Esthet Restor Dent. 2005;17:236-42. 
23. Zhu S, Platt JA. Curing efficiency of three different curing lights at different distances for a hybrid composite. Am J Dent. 2009;22:381-6. 
24. Rueggeberg FA, Jordan DM. Effect of light-tip distance on polymerization of resin composite. Int J Prosthodont. 1993;6:364-70. 
25. Moszner N, Fischer UK, Ganster B, Liska R, Rheinberger V. Benzoyl germanium derivatives as novel visible light photoinitiators for dental materials. Dent Mater. 2008;24:901-7. 
26. Friedl K, Schmalz G, Hiller K, Markl A. Marginal adaptation of class V restorations with and without soft-start polymerization. Oper Dent. 2000;25:26-32. 
27. Junior S, Brandt WC, Hirata R, Sinhoreti MA. Curing influences the adaptation, physical and mechanical properties of composite resin material. Dent Mater. 2011;27:28-30. 
28. Feilzer AJ, Dooren LH, De Gee AJ, Davidson CL. Influence of light intensity on polymerization shrinkage and integrity of restoration‐cavity interface. EUR J ORAL SCI. 1995;103:322-326. 
29. Ernst CP, Brand N, Frommator U, Rippin G, Willershausen B. Reduction of polymerization shrinkage stress and marginal microleakage using soft-start polymerization. J Esthet Restor Dent. 2003;15:93-104. 
30. de Camargo EJ, Moreschi E, Baseggio W, Cury JA, Pascotto RC.-Composite depth of cure using four polymerization techniques. J Appl Oral Sci. 2009;17:446-50. 
31. Prati C, Chersoni S, Montebugnoli L, Montanari G. Effect of air, dentin and resin-based composite thickness on light intensity reduction. ADJ. 1999;12:231-4.
32. Subbiya A, Mary NS, Suresh M, Vivekanandhan P, Dhakshinamoorthy M, Sukumaran VG. Comparison of variation in the light curing cycle with a time gap and its effect on polymerization shrinkage, degree of conversion and microhardness of a nanohybrid composite. JCD. 2015;18:154. 
33. Rode KM, Kawano Y, Turbino ML. Evaluation of curing light distance on resin composite microhardness and polymerization. Oper Dent. 2007;32:571-8.
Alexandria Dental Journal
Volume 46, Issue 2
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
August 2021
Pages 76-83

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