title: Evaluation of Ultrashort and Longer Implants with Microrough Surfaces: Results of a 24- to 36-Month Prospective Study.
abstract: OBJECTIVE
  The aim of this prospective study was to establish if ultrashort implants are a reliable therapeutic solution by evaluating their effect on mean crestal bone loss and assessing their survival and success rates.
  
  
  METHODS
  Patients were treated using 6-, 9-, and 11-mm-long implants with sandblasted and acid-etched surfaces and fitted with fixed partial prostheses. Clinical and radiographic examinations were scheduled yearly. Data collected included the implant positioning site, implant length and diameter, peri-implant bone loss (PBL), and clinical and anatomical C/I ratios.
  
  
  RESULTS
  One hundred eleven implants (6-mm-long, 30.6%) were positioned; two implants were lost before loading. During the 36-month followup, no other implants were lost (98.2% survival rate, 100% from loading), but four implants did not meet the criteria for success, due to excessive crestal bone loss, resulting in a 94.6% success rate, 96.3% from loading. Success rates and peri-implant bone loss were not significantly different among implants with different lengths. No correlation was observed between implant length and bone resorption.
  
  
  CONCLUSIONS
  Six-millimeter-long implants did not show different results in comparison with 9- and 11-mm-long implants. They can be considered a reliable solution for implant prosthetic rehabilitation and a dependable and minimally invasive therapeutic option in areas showing severe bone resorption.
authors.forename: Luciano
authors.initials: L
authors.lastname: Malchiodi
authors.forename: Riccardo
authors.initials: R
authors.lastname: Caricasulo
authors.forename: Alessandro
authors.initials: A
authors.lastname: Cucchi
authors.forename: Raffaele
authors.initials: R
authors.lastname: Vinci
authors.forename: Enrico
authors.initials: E
authors.lastname: Agliardi
authors.forename: Enrico
authors.initials: E
authors.lastname: Gherlone
mesh_terms: D000328:Adult; D000368:Aged; D016301:Alveolar Bone Loss / Q000473:pathology; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants / Q000706:statistics & numerical data*; D017267:Dental Prosthesis Design / Q000706:statistics & numerical data*; D019094:Dental Prosthesis, Implant-Supported / Q000379:methods; D019232:Dental Restoration Failure / Q000706:statistics & numerical data; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007575:Jaw, Edentulous / Q000601:surgery; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D013499:Surface Properties; D016019:Survival Analysis; D016896:Treatment Outcome
chemical_list: D015921:Dental Implants