A Comparative Five-Year Study of Two vs. One-Stage Screw Type Titanium Implant in Human Clinical Trials

Norman H.K. Kwan, MS, DDS 206 King Street, St. Catharines,Ontario, Canada, L2R 3J7

Abstract:

Placement of 382 screw-type aluminum oxide blasted and acid etched surface titanium implants using conventional two-stage technique were compared with 408 identical implant placed one-stage with a pre-attached 3 mm titanium hexagonal abutment. The presence of the 3 mm hexagonal abutment specifically designed to protruded above the oral mucosal or gingiva during the three to six month healing period, no second stage surgery was required. A total of 172 consecutive patients over a period of 60 months were evaluated.

Clinical parameters such as pocket depth, gingival health, attached epithelium, plaque index, bone loss, calculus index, mobility & pain were evaluated in both techniques. Age, gender, implant length, jaw locations, bone density or type were also analyzed.

Five years life table (Kaplan-Meier) analysis indicated no significant difference in survival between the two-stage (91.6%) and the one-stage (89.7%) P>0.05.

(1) Buser D, Wever HP, Lang: Tissue Integrated on Non-Submerged Implants. One Year Results of a Prospective Study with 100 ITI Hollow-Screw and Hollow Cylinder Implants. Clin Oral Implants Res 1990; 1:33-40.

(2) Bernard J-P, Belser UC, Martinet JP, Borgis SA.: Osseointegration of Branemark Fixtures Using a Single-step Operating Technique. A Preliminary Prospective One-year Study in the Edentulous Mandible. Clin Oral Implants Res 1995;6:122-129.

This research is self-supported.

Presented at:

American Academy of Implant Dentistry 45th Annual Meeting, November 11-14, 1996, Las Vegas (3 year clinical study)
Academy of Osseointegration Twelfth Annual Meeting, March 6-8, 1997, San Francisco, CA (3 year clinical study)
Academy of Osseointegration Fourteenth Annual Meeting, March 4-6, 1999, Palm Springs, CA (5 year clinical study)