BACKGROUNDThe use of composite restorations in dentistry is increasing. Due to this interest in the longevity and reliability of composite fillings, it is also increasing1. One problem that can occur with composite restorations is microleakage. This is when micro-gaps at the tooth-restoration interface allow fluids and bacteria to enter the restoration2. These spaces form when the material is polymerized and shrinks, causing the material to move away from the margins of the preparation2. Problems that may result from microleaks are secondary carriage, hypersensitivity, pulp stimulation and marginal discoloration3. This is why dentists are trying to find ways to reduce microleaks from composite restorations. RESEARCH There are many different areas that can be examined to try to find ways to reduce microleaks from composite fillings. modified glass ionomers (RMGI), flowable composite coatings and no coating, it was found that applying an RMGI coating before placing the composite reduced the extent of micro-leakage3. By doing this, the microleak occurred as far as possible toward the cervical wall, whereas with composite inserts and without an insert, there was leakage toward the cervical wall and into the axial wall3. The reason for this difference could be attributed to the bonding between the glass ionomer and the composite. This bond is weak and can be considered as an unlimited wall, resulting in less shrinkage stress on the bonds between the composite and dentin3.DesensitizersIf desensitizers are used before adhesives, this adds a new layer to the restoration and there could be have a difference with marginal sealing. . On enamel, there is no effect of reducing or increasing micro-leakage, however when...... middle of paper...... Bamide peroxide In Vitro. Operative dentistry 2010; 35(6): 634-40.6. Khosravi K, Ataei E, Mousavi M et al. Effect of phosphoric acid etching of enamel margins on microleakage of a simplified, self-etching all-in-one adhesive system. Operative dentistry 2009; 34(5):531-36.7. Bagis Y, Baltacioglu I, Kahyaogullari S. Comparison of microleakage and lamination methods of silorane-based resin composite in large MOD class II cavities. Operative dentistry 2009; 34(5):578-85.8. Karaman E and Ozgunaltay G. Polymerization removal of different types of composite resins and microleaks with and without coating in class II cavities. Operative dentistry 2014; 39(2):00-00.9. Afshar H, Jafari A, Khami M et al. Evaluation of microleaks in composite-composite and amalgam-composite interfaces in teeth with preventive resin restoration. Journal of Dentistry 2012; 9(2):128-34.