Related Experiment Video
Updated: Aug 2, 2026
An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
Published on: February 10, 2014
A 3 to 4 year study of single tooth hydroxylapatite coated endosseous dental implants
C J Watson1, D Tinsley, A R Ogden
1Division of Restorative Dentistry, Leeds Dental Institute.
Objective:
To evaluate the clinical effectiveness, common complications and maintenance associated with hydroxylapatite (HA) coated cylindrical implants when used to support single crowns.
Design:
A prospective medium term clinical study of the Calcitek HA-coated implant.
Setting:
Implant placement, crown fabrication and follow-up procedures were carried out at the Leeds Dental Institute, between 1990 and 1998.
Subjects And Method:
26 patients (33 implants) participated in the trial. They were referred from general dental practitioners because of their suitability for single tooth implant placement.
Main Outcome Measures:
The implants were assessed using recognised clinical review procedures e.g. radiographs and soft tissue assessments.
Results:
At exposure there was 100% implant integration. The cumulative survival rate over 4 years was 100%. In five implants there was cervical bone loss of more than 4 mm and these were classified as failing. This gave an overall cumulative success rate of 58% by year 4.
Conclusion:
The Calcitek HA-coated single tooth implant shows exceptionally high initial integration however, the longer term results suggest that the cervical bone level adjacent to the implant failed to establish a steady state. Doubts remain regarding the long-term prognosis of these cylindrical HA-coated implants.
