title: Dental Implant Thread Design and the Consequences on Long-Term Marginal Bone Loss.
abstract: OBJECTIVE
  The aim of this study was to present the implant macrostructure effect on marginal bone loss using 3 dental implant thread designs with differences in thread pitch, lead, and helix angle. All implants used were sourced from the same company and had the same microstructured surface.
  
  
  METHODS
  This is a nonrandomized, retrospective, double-blind study. Data were collected by an independent Tel Aviv University group from a general practitioner's private practice patient records. In total, 1361 implants met the inclusion criteria representing the 3 types of implants macrostructure.
  
  
  RESULTS
  Overall survival rate was 96.3% with 50 implants failing (3.7%) out of a total of 1361 implants. Survival rates for the 3 groups were: group A 96.6%, group B 95.9%, and in group C 100%. Average bone loss for groups A, B, and C were 2.02 (±1.70) mm, 2.10 (±1.73) mm, and 1.90 (±1.40) mm, respectively. Pairwise comparisons revealed that less bone loss occurred in group A compared with group B (P = 0.036).
  
  
  CONCLUSIONS
  Favorable long-term bone loss results were found in implants with a larger pitch, deeper apical threads, and a narrower implant core. One-piece V-thread design implants demonstrated 100% survival rate.
authors.affiliation: *Senior Lecturer, Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel. †Clinical Instructor, Department of Oral Rehabilitation, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel Aviv, Israel. ‡Private Office, Tel Aviv, Israel.
authors.forename: Zeev
authors.initials: Z
authors.lastname: Ormianer
authors.forename: Shlomo
authors.initials: S
authors.lastname: Matalon
authors.forename: Jonathan
authors.initials: J
authors.lastname: Block
authors.forename: Jerry
authors.initials: J
authors.lastname: Kohen
mesh_terms: D000328:Adult; D016301:Alveolar Bone Loss / Q000209:etiology*; D003758:Dental Implantation, Endosseous / Q000009:adverse effects / Q000295:instrumentation / Q000379:methods; D015921:Dental Implants / Q000009:adverse effects*; D017268:Dental Prosthesis Retention / Q000379:methods; D006801:Humans; D009910:Oral Hygiene; D012189:Retrospective Studies; D013997:Time Factors
chemical_list: D015921:Dental Implants