title: [Effects of three different root canal preparation techniques on endodontic interappointment pain among the elderly].
abstract: OBJECTIVE
  To study the clinical effects of three different root canal preparations on endodontic interappointment pain (EIAP) among the elderly.
  
  
  METHODS
  In this study, 292 teeth with acute or chronic pulpitis or apical periodontitis were collected from 265 individuals. The samples were divided randomly into three groups. Three root canal preparations were utilized for groups M, G, and H. Modified single length technique with Mtwo instrument was utilized in group M. Modified step-back technique with Gates-Glidden bur was employed in group G, and step-back technique with stainless steel H-files was employed in group H. The EIAP rates were observed and compared.
  
  
  RESULTS
  The rates of EIAP for groups M, G, and H were 5.81%, 6.38%, and 19.64%, respectively. A significant difference was observed between groups M and H (P < 0.012 5) as well as between groups G and H. However, no significant differences were observed between groups M and G (P > 0.012 5).
  
  
  CONCLUSIONS
  Modified single length technique with Mtwo instrument and modified step-back technique with Gates-Glidden bur can reduce EIAP in the elderly.
authors.affiliation: Dept. of Health Care, Qingdao Stomatological Hospital, Qingdao 266001, China.
authors.forename: Zhongliang
authors.initials: Z
authors.lastname: Tang
authors.forename: Fang
authors.initials: F
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Mei
mesh_terms: D000368:Aged; D003786:Dental Pulp Cavity; D006801:Humans; D010146:Pain; D018915:Root Canal Preparation; D013193:Stainless Steel
chemical_list: D013193:Stainless Steel