title: Survival rate of endodontically treated teeth in relation to conservative vs post insertion techniques -- a retrospective study.
abstract: OBJECTIVE
  The purpose of this retrospective, non-randomised cohort study was to evaluate the success rate of 775 endodontically treated teeth depending on the restoration type. A total of 508 patients with 775 endodontically treated teeth were examined during at least 12 months. The radiographic controls, time span between root canal filling and definitive restoration, restoration material type, inserted post system type and the occurrence of possible endodontically as well as restorative post-operative complications were recorded.
  
  
  RESULTS
  18.3% of the 775 investigated teeth were incisors and canines, 33.5% were premolars and 48.2% molars. Pre-fabricated and casted metal post systems were used only in 15.6% of the endodontically treated teeth (18.4% incisors and canines, 44.8% premolars, 36.8% molars). 6.6% of the teeth had endodontically related symptoms or severe complications, whereas in 13.2% of the teeth restored with metal posts showed complications, such as root or crown fractures. The Cox-Regression analysis showed that teeth restored with a post system had a statistically significant higher failure rate (p = 0.044) than those which had been restored without posts.
  
  
  CONCLUSIONS
  The results showed a high success rate for endodontically treated teeth when the final restoration was placed within a short period of time (two weeks). A higher tooth loss was observed when metal post systems were employed suggesting that precaution is recommended when these types of posts are inserted.
authors.affiliation: Department for Operative Dentistry, Johannes Gutenberg University Mainz, Augustusplatz 2, D-55131 Mainz, Germany. willersh@uni-mainz.de
authors.forename: B
authors.initials: B
authors.lastname: Willershausen
authors.forename: H
authors.initials: H
authors.lastname: Tekyatan
authors.forename: F
authors.initials: F
authors.lastname: Krummenauer
authors.forename: B
authors.initials: B
authors.lastname: Briseño Marroquin
mesh_terms: D000180:Acrylic Resins; D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D003188:Composite Resins; D003776:Dental Porcelain; D019232:Dental Restoration Failure; D005260:Female; D006046:Gold; D006801:Humans; D008297:Male; D008875:Middle Aged; D011140:Polyurethanes; D011176:Post and Core Technique; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D016388:Tooth Loss / Q000517:prevention & control*; D019553:Tooth, Nonvital
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; D003776:Dental Porcelain; D006046:Gold