title: [Study on the properties of self-adhering flowable composite].
abstract: OBJECTIVE
  This study was designed to investigate the properties of self-adhering flowable composite by comparison with self-etching adhesive and  traditional composite. Moreover, the effect of additional etching process on the bond strength of dentin was investigated.
  
  
  METHODS
  Totally 90 bovine  incisors were prepared to expose the dentin, and then divided into three groups (Group A, Group B and Group C). A, B and C were treated with flowable  composite, flowable composite and self-etching adhesive, traditional composite and self-etching adhesive respectively. These groups were further  divided into two subgroups, without additional etching process(i.e. A1, B1 and C1) and with additional etching process (i.e. A2, B2 and C2). The bond  strength of those samples was measured and the results were analyzed with a one-way ANOVA.
  
  
  RESULTS
  The shear bond strength of A1 [(3.39±1.71 ) MPa] was lower than B1 [(21.58±4.50) MPa],and there is significant difference (P<0.05) between them. There is no significant difference (P>0.05)  between B1 and C1 [(19.31±6.79) MPa]. After additional etching process, the shear bond strength of A2 [(6.75±3.54) MPa] was higher than A1. As for  self-etching adhesive, the shear bond strength of B2 [(16.56±7.39) MPa] was lower than B1 (P<0.05) and C2 [(11.31±5.54) MPa] was lower than C1  (P<0.05).
  
  
  CONCLUSIONS
  The bond strength of self-adhering flowable composite was lower than that of flowable composite with self-etching adhesive.  There was no significant difference between bond strength of flowable composite with self-etching adhesive and traditional composite with self-etching  adhesive. However, the additional etching process would decrease bond strength of self-etching adhesive and increase the coefficient of variation of  measured results.
authors.affiliation: Department of Dental Materials, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Yong-xiang
authors.initials: YX
authors.lastname: Xu
authors.forename: Jian-min
authors.initials: JM
authors.lastname: Han
authors.forename: Hong
authors.initials: H
authors.lastname: Lin
mesh_terms: D000134:Acid Etching, Dental; D000818:Animals; D002417:Cattle; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003738:Dental Cements / Q000737:chemistry*; D003793:Dental Restoration, Permanent / Q000145:classification / Q000379:methods; D003799:Dental Stress Analysis; D017220:Dentin-Bonding Agents / Q000737:chemistry; D007180:Incisor; D033081:Shear Strength
chemical_list: D003188:Composite Resins; D003738:Dental Cements; D017220:Dentin-Bonding Agents