title: Effect of storage time on microtensile strength of polyacid-modified resin composites.
abstract: OBJECTIVE
  The purpose of this study was to determine the cohesive microtensile strength of four polyacid-modified resin composites (PAMRC: Dyract, Dyract AP, Freedom and F2000) after 24h and 6 months of storage in water using the microtensile technique.
  
  
  METHODS
  Blocks measuring 1.5 cm x 1.5 cm x 1.0 cm were constructed incrementally for each material using a silicone matrix. The blocks were stored in distilled water at 37 degrees C for 24 h and were then serially sectioned in both x and y directions to obtain several beams measuring 1.0 cm x 1.0 mm x 1.0 mm. Each beam was gently trimmed from two sides with ultra-fine diamond burs to reduce the cross-sectional area to a 'neck' of approximately 0.4mm(2) located in the middle of their length. The beams (18-22 per material) were randomly divided and tested in tension either after 24 h or after 6 months of storage in water at 37 degrees C in a Vitrodyne testing machine at 0.6 mm/min.
  
  
  RESULTS
  Mean microtensile strengths (MPa) at 24 h were: 48.7+/-13.8 for Dyract AP; 36.5+/-14.1 for Dyract; 38.2+/-14.5 for Freedom and 48.6+/-7.2 for F2000. There was no statistically significant difference among the materials (p>0.05). At 6 months, only Dyract AP showed significant increase in microtensile strength (p<0.05) while the other materials showed no differences in microtensile strength with time (p>0.05).
  
  
  CONCLUSIONS
  The results indicate that storage in water for 6 months caused no reduction of the microtensile strength of PAMRC materials.
authors.affiliation: Bauru School of Dentistry, USP, Department of Operative Dentistry, Al Dr Octavio Pinheiro Brisolla 9-75, CEP 17012-901, Bauru, SP, Brazil.
authors.forename: J S
authors.initials: JS
authors.lastname: Mendonça
authors.forename: M H S
authors.initials: MH
authors.lastname: Souza
authors.forename: R M
authors.initials: RM
authors.lastname: Carvalho
mesh_terms: D000704:Analysis of Variance; D020770:Compomers / Q000737:chemistry*; D003793:Dental Restoration, Permanent; D003799:Dental Stress Analysis; D004356:Drug Storage; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D013314:Stress, Mechanical; D013718:Tensile Strength; D013997:Time Factors; D014867:Water
chemical_list: D020770:Compomers; C088486:Dyract; C118368:F2000 cement; C477332:Freedom Compomer; D005899:Glass Ionomer Cements; D014867:Water