title: [Comparison of the shear bond strength by using nano silica sol to zirconia basement and veneer porcelain].
abstract: OBJECTIVE
  To investigate the feasibility of using sol gel technique to produce thin layer nano silicon dioxide on zirconia ceramic surface and the effect of improving shear bond strength between zirconia and veneer porcelain.
  
  
  METHODS
  The presintered zirconia specimen was cut into a rectangle block piece (15 mm×10 mm×2.5 mm), a total of 40 pieces were obtained and divided into 4 groups, each group had 10 pieces. Four different treatments were used in each group respectively. Pieces in group A (control group) were only sintered at 1450°C to crystallization; pieces in group B underwent 30% nano silica sol infiltration first and then were sintered at 1450°C to crystallization; piece in group C underwent crystallization first at 1450°C, then 30% nano silica sol infiltration and were sintered at 1450°C again; pieces in group D was coated by nano silica sol and then sintered at 1450°C to crystallization; ten rectangle block pieces (12 mm×8 mm×2 mm) in group E were made. Cylinder veneers 5 mm in diameter and 4 mm in height were produced in each group and the shear bond strength was tested. Data were statistically analyzed by SPSS 19.0 software package.
  
  
  RESULTS
  The shear bond strength of the 5 group specimens were: (28.12±2.95) MPa in group A, (31.09±3.94) MPa in group B, (25.60±2.45) MPa in group C, (31.75±4.90) MPa in group D, (28.67±3.95) MPa in group E, respectively. Significant differences existed between the 5 groups, and group C had significant difference compared with group B and D. CONCLUSIONS：① Use of nano silicon sol gel on presintered zirconia surface to make thin layer of nano silicon dioxide can improve the shear bond strength between zirconia and veneer; ②Using nano silicon sol gel on crystallization zirconia surface to make thin layer of nano silicon dioxide will decrease the shear bond strength between zirconia and veneer; ③ Zirconia veneer bilayer ceramic has the same shear bond strength with porcelain fused to Ni Cr alloy; ④Use of sol gel technique to produce thin layer nano silicon dioxide on zirconia ceramic surface is feasible and can improve shear bond strength between zirconia and veneer porcelain.
authors.affiliation: Department of Prosthodontic, Stomatology Hospital of Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China. E-mail:WSQ982004@163.com.
authors.forename: Si-qian
authors.initials: SQ
authors.lastname: Wang
authors.affiliation: Department of Prosthodontic, Stomatology Hospital of Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China.
authors.forename: Da-feng
authors.initials: DF
authors.lastname: Zhang
authors.affiliation: Department of Prosthodontic, Stomatology Hospital of Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China.
authors.forename: Tie-li
authors.initials: TL
authors.lastname: Zhen
authors.affiliation: Department of Prosthodontic, Stomatology Hospital of Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China.
authors.forename: Jing-yuan
authors.initials: JY
authors.lastname: Yang
authors.affiliation: Department of Prosthodontic, Stomatology Hospital of Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China.
authors.forename: Ting-ting
authors.initials: TT
authors.lastname: Lin
authors.affiliation: Department of Prosthodontic, Stomatology Hospital of Wenzhou Medical University. Wenzhou 325027, Zhejiang Province, China.
authors.forename: Jian-feng
authors.initials: JF
authors.lastname: Ma
mesh_terms: D000537:Aluminum Oxide; D002516:Ceramics; D001840:Dental Bonding; D003764:Dental Materials; D003776:Dental Porcelain / Q000737:chemistry*; D003801:Dental Veneers; D006801:Humans; D008422:Materials Testing; D019904:Polymethyl Methacrylate; D033081:Shear Strength; D012822:Silicon Dioxide; D013314:Stress, Mechanical; D013499:Surface Properties; D015040:Zirconium
chemical_list: D003764:Dental Materials; D003776:Dental Porcelain; D012822:Silicon Dioxide; D019904:Polymethyl Methacrylate; D015040:Zirconium; D000537:Aluminum Oxide; C028541:zirconium oxide