title: Resin composite polyethylene fiber reinforcement: effect on fracture resistance of weakened marginal ridges.
abstract: OBJECTIVE
  To investigate the in vitro effect of polyethylene woven fiber reinforcement of resin composite on the fracture resistance of weakened marginal ridges in molar teeth.
  
  
  METHODS
  50 sound extracted human mandibular molars were used. Specimens were divided into five groups (n = 10). Group 1: served as a control for comparison; Group 2: Class I cavity preparation with resin composite (Prodigy); Group 3: Class I cavity preparation with polyethylene ribbon fiber (Ribbond) and resin composite. Group 4: Class II cavity preparation with resin composite restoration; Group 5: Class II cavity preparation with polyethylene woven fiber and resin composite. Specimens were stored in 100% humidity at 37 degrees C for 7 days. Compressive loading of the teeth was performed with a universal testing machine at a cross-head speed of 0.5 mm/minute until failure. The data were analyzed with 1-way ANOVA followed by the Ryan-Einot-Gabriel-Welsch Multiple Range Test (alpha = 0.05).
  
  
  RESULTS
  Reinforcement with polyethylene fiber resulted in significant differences for fracture resistance (P < 0.001). Mean fracture resistance (SD) was [1737.4 (84.8) N] for control group. Among the experimental groups, the highest mean fracture resistance (SD) [1543.8 (71.1) N] was associated with Class I cavity preparation with polyethylene fiber and resin composite. The lowest mean fracture resistance (SD) [869.2 (91.7) N] was recorded for Class II cavity preparation with conventional resin composite.
authors: Section of Restorative Dentistry, Prosthodontics and Endodontics, College of Dentistry, University of Tanta, Egypt. ayadmf@hotmail.com
authors: Mohamed F
authors: MF
authors: Ayad
authors: Abdulhamaid A
authors: AA
authors: Maghrabi
authors: Franklin
authors: F
authors: García-Godoy
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D003737:Dental Cavity Preparation / Q000009:adverse effects*; D003743:Dental Enamel; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D008963:Molar; D011095:Polyethylenes; D014082:Tooth Fractures / Q000209:etiology / Q000517:prevention & control*
chemical_list: D003188:Composite Resins; D011095:Polyethylenes; C084063:RIBBOND