title: [Clinical evaluation of wedge-shaped defect restored by gingival retraction technique].
abstract: OBJECTIVE
  To evaluate the periodontal conditions after the wedge-shaped defect was restored by gingival retraction technique.
  
  
  METHODS
  A total of 138 mandibular premolars with wedge-shaped defect were selected and divided into A, B groups. Group A was restored with Dyract after using retraction cord. Group B was directly restored with Dyract. Clinical parameters including plaque index (PLI), gingival index (GI), sulcus bleeding index (SBI), probing depth (PD), volumes of gingival crevicular fluid (GCF) and levels of aspartate aminotransferases (AST) of gingival crevicular fluid were measured at baseline, 1 week, 1 month, 3 months and 6 months after operation.
  
  
  RESULTS
  There was no difference in PLI, GI, SBI, PD between group A and B during 6 months after operation, while the difference of GCF and AST was significant between group A and B at 3 months and 6 months after operation (P < 0.05, P < 0.01).
  
  
  CONCLUSIONS
  Gingival retraction technique applied in wedge-shaped defect restoration can reduce the damage to the periodontal tissue.
authors: Center of Stomatology, Taizhou Hospital, Zhejiang Province, Linhai Zhejiang 317000, China. weijiangyang@sohu.com
authors: Wei-jiang
authors: WJ
authors: Yang
authors: Geng-sheng
authors: GS
authors: Shi
authors: Li-rong
authors: LR
authors: Liang
authors: Fang-chao
authors: FC
authors: Ruan
authors: Hui-juan
authors: HJ
authors: Gao
authors: Yong-qing
authors: YQ
authors: Tong
mesh_terms: D000293:Adolescent; D000328:Adult; D001219:Aspartate Aminotransferases / Q000032:analysis; D003774:Dental Plaque Index; D003793:Dental Restoration, Permanent / Q000379:methods*; D005260:Female; D005883:Gingival Crevicular Fluid / Q000201:enzymology; D006801:Humans; D008297:Male; D010512:Periodontal Index; D055815:Young Adult
chemical_list: D001219:Aspartate Aminotransferases