title: Evaluation of cervical marginal and internal adaptation using newer bulk fill composites: An in vitro study.
abstract: OBJECTIVE
  To evaluate the cervical marginal and internal adaptation of posterior bulk fill resin composites of different viscosities, before and after thermo-cycling (TMC).
  
  
  METHODS
  Eighty box-only class II cavities were prepared in 40 extracted human premolars with the distal proximal box beneath the enamel-cementum junction (CEJ). The teeth in the experimental groups were restored with bulk fill resin composite restorations (Gr. I- Sonic Fill, Gr. II- SDR, Gr. III- Tetric N Ceram Bulk Fill or a conventional composite designed for 2-mm increments (Gr. IV- Tetric N Flow along with Tetric N Ceram). Before and after thermal cycling, the gap-free marginal length was analyzed using SEM of epoxy resin replicas. After thermal cycling, specimens were cut longitudinally in order to investigate internal dentine adaptation by epoxy replicas under SEM (500 × magnification).
  
  
  RESULTS
  Statistical analysis was performed using the ANOVA and Tukey Post Hoc tests (P < 0.05). In enamel, high percentages of gap-free margins were initially identified for all the groups, which declined after thermal cycling. However, no significant differences were identified among any of the groups (P > 0.05). In dentine, bulk fill groups performed at par with the incremental placement; for both marginal and internal adaptation (P < 0.05), for all materials except Tetric N Ceram Bulk Fill.
  
  
  CONCLUSIONS
  Viscosity of the bulk fill restorative material influenced the proportion of gap-free marginal interface and the internal adaptation in dentin.
authors: Department of Conservative Dentistry, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.
authors: Rolly Shrivastav
authors: RS
authors: Agarwal
authors: Department of Conservative Dentistry, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.
authors: Hemlatha
authors: H
authors: Hiremath
authors: Department of Prosthodontics, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.
authors: Jatin
authors: J
authors: Agarwal
authors: Department of Orthodontics, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India.
authors: Ashish
authors: A
authors: Garg
keywords: Bulk fill; composites; flowables; margin adaptation
references: Oper Dent. 2012 May-Jun;37(3):316-23
references: 22313277
references: J Dent. 2011 Oct;39(10):643-7
references: 21801799
references: J Adhes Dent. 2013 Apr;15(2):115-21
references: 23534015
references: Dent Mater. 2010 May;26(5):443-8
references: 20170946
references: J Am Dent Assoc. 2002 Oct;133(10):1387-98
references: 12403542
references: Dent Mater. 2011 Apr;27(4):348-55
references: 21194743
references: Oper Dent. 2010 Jul-Aug;35(4):441-7
references: 20672729
references: Dent Mater. 2013 Mar;29(3):269-77
references: 23228335
references: J Am Dent Assoc. 2006 Jan;137(1):71-80
references: 16457002
references: Dent Mater. 2011 Jan;27(1):29-38
references: 21093034
references: Dent Mater. 2012 Jul;28(7):801-9
references: 22575738
references: J Dent Res. 2011 May;90(5):596-601
references: 21282725
references: Dent Update. 2010 Mar;37(2):115-8, 120-2, 124-5
references: 20415012
references: J Dent. 2014 Apr;42(4):439-49
references: 24480086
references: Dent Mater. 2010 Nov;26(11):1113-8
references: 20800270
references: Eur J Dent. 2014 Jan;8(1):1-8
references: 24966739
references: J Conserv Dent. 2010 Jan;13(1):9-15
references: 20582213
references: J Am Dent Assoc. 2003 Jun;134(6):721-8
references: 12839408
references: J Adhes Dent. 2007;9 Suppl 1:117-20
references: 18341238
references: J Contemp Dent Pract. 2008 Nov 01;9(7):65-72
references: 18997918
references: Dent Mater. 2011 Feb;27(2):150-6
references: 20952051
references: J Dent Biomech. 2010;2010:null
references: 20948573
references: J Dent. 2012 Jun;40(6):500-5
references: 22390980
references: J Am Dent Assoc. 1991 Apr;122(4):65-70
references: 2022790