title: Long-term results in placement of screw-type implants in the pterygomaxillary-pyramidal region.
abstract: OBJECTIVE
  To present the long-term results for screw-type implants consecutively placed in the pterygomaxillary-pyramidal region in the treatment of patients with posterior maxillary edentulism.
  
  
  METHODS
  One hundred fifty-two implants were inserted in 92 partially edentulous patients using cylindric osteotomes as bone-site formers, thus minimizing the use of drills in the bone preparation.
  
  
  RESULTS
  The 152 implants placed were loaded for an average of 89.7+/-30.7 months. There were a total of 8 failures; 6 took place between implant placement and prosthesis delivery (early failures), and 2 failed in following functional loading. The overall survival rate was 94.7%.
  
  
  CONCLUSIONS
  Cylindric osteotomes allow the surgeon to accurately place implants. The use of surgical drilling was minimized, resulting in lowered surgical risk and diminished bone loss.
  
  
  CONCLUSIONS
  Implant placement in the posterior pterygomaxillary region using cylindric osteotomes for osteotomy preparation resulted in an implant survival rate of 94.7%.
authors.affiliation: jfernandez@dbbf.ulpgc.es
authors.forename: Jesús Fernández
authors.initials: JF
authors.lastname: Valerón
authors.forename: Pilar F
authors.initials: PF
authors.lastname: Valerón
mesh_terms: D000328:Adult; D000368:Aged; D001641:Bicuspid; D003758:Dental Implantation, Endosseous / Q000295:instrumentation / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007576:Jaw, Edentulous, Partially / Q000534:rehabilitation*; D053208:Kaplan-Meier Estimate; D008137:Longitudinal Studies; D008297:Male; D008437:Maxilla / Q000601:surgery*; D008875:Middle Aged; D008963:Molar; D010027:Osteotomy / Q000295:instrumentation; D016016:Proportional Hazards Models; D013100:Sphenoid Bone / Q000601:surgery*
chemical_list: D015921:Dental Implants