title: [The occurrence of the endodontic interappointment emergencies after root canal preparation by step back or step down technique].
authors.forename: Ren-fei
authors.initials: RF
authors.lastname: Wang
authors.forename: Mei
authors.initials: M
authors.lastname: Xu
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004630:Emergencies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010149:Postoperative Pain / Q000209:etiology*; D018915:Root Canal Preparation / Q000009:adverse effects* / Q000379:methods*; D014098:Toothache / Q000209:etiology*