title: [Experimental study on microleakage between a new nano-hydroxyapatite composite and tooth].
abstract: OBJECTIVE
  To evaluate the marginal adaptation between the new nano-hydroxyapatite composite resin and tooth.
  
  
  METHODS
  Thirty extracted healthy premolars were randomly assigned to three groups according to the material employed: New nano-hydroxyapatite composite resin (Group A), Karisma composite resin (Group B), and glass ionomer cement (Group C). After the thermal cycling, the teeth were immersed in 2% methylene blue dye, and the depth of microleakage between the composite and tooth structure were observed.
  
  
  RESULTS
  The microleakage depth of group A, B and C were (1.20+/-0.81), (1.94+/-0.70), and (1.73+/-0.54) mm, respectively. No statistically significant differences were found among the three groups (P>0.05). There was no significant difference in the degree of microleakage (P>0.05).
  
  
  CONCLUSIONS
  As a new dental restorative material, new nano-hydroxyapatite composite resin has good bonding performance to the tooth structure.
authors.affiliation: Dept. of Oral Medicine, The Affiliated Hospital of Binzhou Medical College, Binzhou 256600, China.
authors.forename: Meng-meng
authors.initials: MM
authors.lastname: Zhao
authors.forename: Qingshan
authors.initials: Q
authors.lastname: Wang
authors.forename: Shuang
authors.initials: S
authors.lastname: Wang
authors.forename: Rui
authors.initials: R
authors.lastname: Li
mesh_terms: D003188:Composite Resins; D003763:Dental Leakage; D003793:Dental Restoration, Permanent; D017886:Durapatite; D005899:Glass Ionomer Cements; D006801:Humans; D019279:Resin Cements
chemical_list: D003188:Composite Resins; D005899:Glass Ionomer Cements; D019279:Resin Cements; D017886:Durapatite