title: Influence of a simulated oral environment on dentin bond strength of two adhesive systems.
abstract: OBJECTIVE
  To evaluate in vitro the influence of different clinical conditions (temperature, relative humidity) on dentin bond strength.
  
  
  METHODS
  Two different bonding systems were studied, ScotchBond Multi-Purpose Plus (SBMP) and Clearfil SE Bond (SE Bond). In the first part of the study, the different environmental conditions were: ambient conditions, i.e. 20 degrees C/30% relative humidity (RH), 30 degrees C/50% RH, 30 degrees C/65% RH, 33 degrees C/80% RH and 35 degrees C/95% RH. In the second part, the different interfaces (dentin/primer, primer/adhesive and adhesive/composite for SBMP and primer/adhesive, adhesive/composite for SE Bond) were also studied in order to explain the results obtained in the first part of the study. After the bonding procedure, a composite cylinder (Z100) was bonded to the surface using a Teflon mold (diameter: 3 mm/height: 5 mm). The different specimens were tested in a shear bond mode after a 24-hour storage in distilled water at 37 degrees C.
  
  
  RESULTS
  For SBMP, the shear bond strengths decreased when temperature/RH increased. The average values were very low when the 35 degrees C/95% RH conditions were simulated. A study of the interfaces showed that the primer/adhesive interface was the most sensitive to the environmental conditions simulated. For SE Bond, a decrease occurred but only at the highest temperature/humidity conditions. The interface study did not provide an explanation of the results obtained in the first part of the study.
authors.affiliation: Biomaterials Research Group, Faculty of Dentistry, University Paris V, Montrouge, France. cath.besnault@wanadoo.fr
authors.forename: C
authors.initials: C
authors.lastname: Besnault
authors.forename: J P
authors.initials: JP
authors.lastname: Attal
mesh_terms: D000704:Analysis of Variance; D003188:Composite Resins; D001840:Dental Bonding; D003804:Dentin; D003806:Dentin Permeability; D017220:Dentin-Bonding Agents; D006801:Humans; D006813:Humidity; D008422:Materials Testing; D009055:Mouth; D011897:Random Allocation; D019279:Resin Cements; D012822:Silicon Dioxide; D013314:Stress, Mechanical; D013696:Temperature; D013718:Tensile Strength; D015040:Zirconium
chemical_list: C438313:Clearfil SE Bond; D003188:Composite Resins; D017220:Dentin-Bonding Agents; D019279:Resin Cements; C425844:Scotchbond Multi-Purpose Plus; C083568:Z100 composite resin; D012822:Silicon Dioxide; D015040:Zirconium