title: Effect of different placement techniques on marginal microleakage of deep class-II cavities restored with two composite resin formulations.
abstract: OBJECTIVE
  The study aims to evaluate and compare marginal microleakage in deep class II cavities restored with various techniques using different composites.
  
  
  METHODS
  Sixty freshly extracted teeth were divided into six groups of 10 teeth each. Standardized class II cavities were made and were restored using composites of different consistencies with different placement techniques. Group 1 with Microhybrid composite, Group 2 with Packable composite, Group 3 Microhybrid composite with a flowable composite liner, Group 4 Packable composite with a flowable composite liner, Group 5 Microhybrid composite with precured composite insert in second increment and Group 6 Packable composite with precured insert in second increment. Specimens then were stored in distilled water, thermocycled and immersed in 50% silver nitrate solution. These specimens were sectioned and evaluated for microleakage at the occlusal and cervical walls separately using stereomicroscope.
  
  
  RESULTS
  The results demonstrated that in the occlusal wall, packable composite, showed significantly more marginal microleakage than the other groups. In the cervical wall, teeth restored with a flowable composite liner showed less marginal microleakage when compared to all other groups.
  
  
  CONCLUSIONS
  Based on the results of this study, the use of flowable composite as the first increment is recommended in deep class II cavities.
authors.affiliation: Department of Conservative Dentistry and Endodontics, Sri Sai College of Dental Surgery, Vikarabad, India.
authors.forename: Radhika
authors.initials: R
authors.lastname: M
authors.forename: Girija S
authors.initials: GS
authors.lastname: Sajjan
authors.forename: Kumaraswamy
authors.initials: K
authors.lastname: B N
authors.forename: Neetu
authors.initials: N
authors.lastname: Mittal