title: Evaluation of the microleakage at the proximal walls of Class II cavities restored using resin composite and precured composite inserts.
abstract: OBJECTIVE
  This in vitro study compared the microleakage of resin composite restorations placed in Class II cavity preparations using an incremental placement technique with and without the addition of precured resin composite inserts.
  
  
  METHODS
  Sixty standardized mesio-occlusal and disto-occlusal cavities were prepared in 30 recently extracted molar teeth. Twenty cavities were restored by employing the incremental placement technique (group I), and 40 cavities were restored using the incremental placement in the presence of precured composite inserts of two sizes: 1 x 3 mm (group II) and 1.25 x 3 mm (group III). The restored teeth were thermocycled for 250 cycles in water baths set at temperatures of 5 degrees C and 50 degrees C using a 30-second dwell time, stained, and sectioned horizontally at the middle of the restoration. Following sectioning, each specimen was microscopically examined at x 4 magnification. The extent of dye penetration at the tooth/restoration interface was scored for each test group, and the scores obtained were subjected to one-way analysis of variance (ANOVA) and Tukey's pairwise comparison at a 95% significance level.
  
  
  RESULTS
  The current investigation showed statistically significant differences in dye penetration between the three test groups.
  
  
  CONCLUSIONS
  The use of precured resin composite inserts with the incremental placement technique in the restoration of Class II cavity preparations seems to improve the marginal seal of the proximal walls of finished restorations.
authors: Department of Conservative Dentistry and Prosthodontics, Faculty of Dentistry, The University of Jordan, Amman, Jordan. fouadk@ju.edu.jo
authors: Fouad Kadim
authors: FK
authors: Wahab
authors: Firas Jiries
authors: FJ
authors: Shaini
mesh_terms: D000704:Analysis of Variance; D004396:Coloring Agents; D003188:Composite Resins; D003763:Dental Leakage / Q000175:diagnosis / Q000209:etiology; D003793:Dental Restoration, Permanent / Q000009:adverse effects / Q000379:methods*; D017220:Dentin-Bonding Agents; D006801:Humans; D008963:Molar; D010316:Particle Size; D019279:Resin Cements; D012822:Silicon Dioxide; D018709:Statistics, Nonparametric; D015040:Zirconium
chemical_list: D004396:Coloring Agents; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium