Postmortem histologic evaluation of mandibular titanium and maxillary hydroxyapatite-coated implants from 1 patient

Area of Science:

• Biomaterials Science
• Dental Implantology
• Histology

Background:

• Evaluating endosseous implant surfaces requires postmortem examination of human specimens.
• Understanding the bone-implant interface is crucial for assessing long-term implant success.
• Commercially pure titanium and hydroxyapatite (HA)-coated implants are commonly used in dental applications.

Purpose of the Study:

• To compare the bone-implant interface characteristics of titanium and HA-coated endosseous implants.
• To evaluate the long-term compatibility and success of different implant surface materials.
• To assess the structural integrity of HA coatings after prolonged clinical service.

Main Methods:

• Postmortem examination of human mandibular and maxillary specimens.
• Analysis of 5 commercially pure titanium screw-type implants (85 months in service).
• Analysis of 2 hydroxyapatite (HA)-coated implants (38 months in service).

Main Results:

• All examined implants were stable at the time of death.
• Mandibular titanium implants exhibited an average of 65% bone contact.
• Maxillary HA-coated implants showed an average of 47% bone contact.
• HA coating delamination was observed in some maxillary implants.
• Delaminated HA coating was found in connective tissue or surrounded by epithelium.
• Distinct differences in bone contact patterns were noted between titanium and HA-coated surfaces.

Conclusions:

• Significant differences exist in bone integration patterns between titanium and HA-coated endosseous implants.
• Hydroxyapatite coating delamination may compromise implant-bone contact and long-term stability.
• Further research is needed to optimize HA coating adhesion and clinical performance.