• Syeda Mahvash Hussain Aga Khan University Hospital
  • Farhan Raza Khan Aga Khan University Hospital Karachi


Background: When a light cure composite resin is used to restore a class V lesion, certain stresses are generated at the tooth-restoration interface. If these stresses exceed the bond strength of the restorative material, microscopic gaps are formed which eventually cause micro-leakage at the tooth-restoration interface. The objective of the present study was to compare the micro-leakage values at the tooth-restoration interface using dye penetration method between a Nano filled and a Micro hybrid light cured composite resin in class V cavities using the self-etch technique. Methods: Sixty class V cavities were made coronal to the cemento-enamel junction in the extracted premolars. These were then randomly divided into two study groups. Group A: Self-etch; filled with P-60 (micro-hybrid) n=30. Group B: Self-etch; filled with Z-350 (nano-filled) n=30. Specimens were subjected to thermo-cycling at 5–55 °C±2 °C with a 30 seconds dwell time. After which they were stained with 2% methylene blue. Later, sectioned bucco-lingually and examined using a stereo microscope (magnification X4) at the occlusal, axial and gingival surfaces. Micro-leakage around the tooth-restoration interface was assessed by using the degree of dye penetration in millimetres. Results: There was 100% micro leakage seen at both the occlusal and gingival surfaces when using the P-60 composite. With the Z-350 composite 84% occlusal and 88% of the gingival surfaces exhibited micro-leakage. Conclusions: With respect to micro-leakage in class V cavities, Z-350 was found to be a superior restorative material compared to P-60 on the occlusal surface. Overall, there is no statistically significant difference in the micro-leakage exhibited by the two restorative materials in class V preparations subjected to self-etch protocol.Keywords: Class V lesions; self-etch; nanocomposite and micro-hybrid composite


Ritter AV. Posterior composites revisited. J Esthet Restor Dent 2008;20(1):57–67.

Toledano M, Osorio E, Osorio R, Garcia-Godoy F. Micro-leakage of Class V resin-modified glass ionomer and compomer restorations. J Prosthet Dent 1999;81(5):610–5.

de Almeida JB, Platt JA, Oshida Y, Moore BK, Cochran MA, Eckert GJ. Three different methods to evaluate micro-leakage of packable composites in Class II restorations. Oper Dent 2002;28(4):453–60.

Feilzer AJ, De Gee AJ, Davidson CL. Curing contraction of composites and glass-ionomer cements. J Prosthet Dent 1988;59(3):297–300.

Suliman AH, Boyer DB, Lakes RS. Polymerization shrinkage of composite resins: comparison with tooth deformation. J Prosthet Dent 1994;71(1):7–12.

Neiva IF, de Andrada MA, Baratieri LN, Monteiro Junior S, Ritter AV. An in vitro study of the effect of restorative technique on marginal leakage in posterior composites. Oper Dent 1998;23(6):282–9.

Bagis YH, Baltacioglu IH, Kahyaogullari S. Comparing micro-leakage and the layering methods of silorane-based resin composite in wide Class II MOD cavities. Oper Dent 2009;34(5):578–85.

HF A. Resin polymerization. In: HF A, editor. Tooth coloured restoratives principles and techniques. 9th ed. Hamilton, Ontario Canada: BC Decker Inc; 2002. p. 81–110.

Mahapatra A. Comparison of shear bond strength, micro-leakage and flexural strenth of a micro-hybrid, hybrid and a nanocomposite in primary teeth-an in vitro study. 2006.

Majeed A. An in vitro study of micro-leakage and surface microhardness of nanocomposite restorative materials. Bellville Univ West Cape. 2005.

Leinfelder KF, Kurdziolek SM. Self-etching bonding agents. Compend Contin Educ Dent 2003;24(6):447–54.

Hegde MN, Vyapaka P, Shetty S. A comparative evaluation of micro-leakage of three different newer direct composite resins using a self-etching primer in class V cavities: An in vitro study. J Conserv Dent 2009;12(4):160–3.

Awliya WY, El-Sahn AM. Leakage pathway of Class V cavities restored with different flowable resin composite restorations. Oper Dent 2008;33(1):31–6.

Umer F, Naz F, Khan FR. An in vitro evaluation of micro-leakage in class V preparations restored with Hybrid versus Silorane composites. J Conserv Dent 2011;14(2):103–7.

Sharma RD, Sharma J, Rani A. Comparative evaluation of marginal adaptation between nanocomposites and micro-hybrid composites exposed to two light cure units. Indian J Dent Res 2011;22(3):495.

Ernst CP, Galler P, Willershausen B, Haller B. Marginal integrity of class V restorations: SEM versus dye penetration. Dent Mater 2008;24(3):319–27.

Takahashi H, Finger WJ, Wegner K, Utterodt A, Komatsu M, Wostmann B, et al. Factors influencing marginal cavity adaptation of nanofiller containing resin composite restorations. Dent Mater 2010;26(12):1166–75.

Nguyen C. A new in vitro method for the study of micro-leakage of dental restorative materials. 2007.

Gallato A, Angnes G, Reis A, Loguercio AD. Long-term monitoring of micro-leakage of different amalgams with different liners. J Prosthet Dent 2005;93(6):571–6.

Perdigão J, Dutra-Corrêa M, Saraceni CH, Ciaramicoli MT, Kiyan VH, Queiroz CS. Randomized clinical trial of four adhesion strategies: 18-month results. Oper Dent 2012;37(1):3–11.

Owens BM, Johnson WW. Effect of single step adhesives on the marginal permeability of Class V resin composites. Oper Dent 2007;32(1):67–72.

Brackett WW, Haisch LD, Pearce MG, Brackett MG. Micro-leakage of Class V resin composite restorations placed with self-etching adhesives. J Prosthet Dent 2004;91(1):42–5.

Ghasemi A, Torabzadeh H, Mahdian M, Afkar M, Fazeli A, Akbarzadeh Baghban A. Effect of bonding application time on the micro-leakage of Class V sandwich restorations. Aust Dent J 2012;57(3):334–8.

Nagpal R, Manuja N, Tyagi SP, Singh UP. In vitro bonding effectiveness of self-etch adhesives with different application techniques: A micro-leakage and scanning electron microscopic study. J Conserv Dent 2011;14(3):258–63.

Usha H, Kumari A, Mehta D, Kaiwar A, Jain N. Comparing micro-leakage and layering methods of silorane-based resin composite in class V cavities using confocal microscopy: An in vitro study. J Conserv Dent 2011;14(2):164–8.

Unal M, Hubbezoglu I, Zan R, Kapdan A, Hurmuzlu F. Effect of acid etching and different Er: YAG laser procedures on micro-leakage of three different fissure sealants in primary teeth after aging. Dent Mater J 2013;32(4):557–63.

Gunjal S, Nagesh L, Raju H. Comparative evaluation of marginal integrity of glass ionomer and resin based fissure sealants using invasive and non-invasive techniques: An in vitro study. Indian J Dent Res 2012;23(3):320–5.

Tulunoglu O, Uctasli MB, Ozdemir S. Coronal micro-leakage of temporary restorations in previously restored teeth with amalgam and composite. Oper Dent 2005;30(3):331–7.



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