title: [Hardness development of self-adhesive resin cement in simulated root canal].
abstract: OBJECTIVE
  To compare the hardness development of dual-cured self-adhesive and universal resin cement in simulated root canal.
  
  
  METHODS
  The light-proof half-cylinder steel slot with one end open were syringed and filled respectively by self-adhesive A (RelyX Unicem), B (BisCem) and universal C (DUOLINK) resin cements, then the open end of slot was irradiated directly by a light unit for 20 s. Specimens were stored in a light-proof box for 0.5 h, Knoop microhardness was measured along the vertical surfaces of specimens from 1 mm to 10mm depth at 1 mm intervals. The same measurements were taken at 24 h and 120 h after irradiation. Data were analyzed by One-way ANOVA.
  
  
  RESULTS
  Hardness of each group decreased with the increase of simulated canal depth (P<0.001), however hardness showed no significant change between 5 mm and more depth of group A, between 4 mm and more depth of group B and C. The increase of hardness for each group was more rapid within 0.5 h after irradiation, thereafter the hardness increased gradually to maximum at 24 h. At 120 h after irradiation, hardness of group C was greater than that of other two groups at more than 1 mm depth (P<0.001).
  
  
  CONCLUSIONS
  Under dual-cured condition, hardness has significant difference between self-adhesive and universal resin cements, however their hardness development is similar.
authors: Dept. of Prosthodontics, School of Stomatology, Nanjing University & Nanjing Stomatological Hospital, Nanjing 210008, China.
authors: Hong
authors: H
authors: Ding
authors: Weidong
authors: W
authors: Lan
authors: Xiangfeng
authors: X
authors: Meng
mesh_terms: D000269:Adhesives; D003786:Dental Pulp Cavity; D006244:Hardness; D006801:Humans; D008422:Materials Testing; D019279:Resin Cements; D012390:Root Canal Therapy
chemical_list: D000269:Adhesives; D019279:Resin Cements; C095998:Adhesive cement