Correlation Between Histopathological Findings and Clinical Causes of Dental Implant Failure

Abstract

Background
Dental implant failure is a multifactorial clinical problem involving biological, mechanical, and prosthetic factors. Histopathological examination of failed implants may provide important information regarding the tissue changes underlying implant failure and may help distinguish biologically mediated from mechanically related complications.
Aim
To evaluate the clinical causes and histopathological characteristics of dental implant failure and to identify clinical and histopathological factors independently associated with biologically mediated implant failure.
Materials and Methods
This study evaluated 100 patients with dental implant failure. Demographic and clinical characteristics, including age, gender, smoking status, diabetes mellitus, history of periodontal disease, and implant location, were recorded. The clinical causes of implant failure were categorized as peri-implantitis, lack of osseointegration, mechanical overload, implant fracture, prosthetic complications, infection/abscess, and other causes. Histopathological examination assessed inflammatory infiltrates, fibrous connective tissue formation, bone resorption, necrotic tissue, foreign-body giant cells, and reduced or absent osseointegration. Associations between clinical causes and histopathological findings were evaluated using the Chi-square test or Fisher’s exact test. Spearman’s correlation analysis assessed relationships between histopathological characteristics and clinical severity. Multivariable logistic regression was performed to identify independent predictors of biologically mediated implant failure. Statistical significance was established at p < 0.05.
Results
Peri-implantitis was the most frequent clinical cause of implant failure (32.0%), followed by lack of osseointegration (24.0%) and mechanical overload (16.0%). Chronic inflammatory infiltrate was the most common histopathological finding (62.0%), followed by bone resorption (53.0%) and lymphoplasmacytic infiltration (48.0%). A significant association was observed between clinical failure causes and histopathological findings (probability (p) = 0.044). Reduced osseointegration demonstrated the strongest correlation with clinical severity Spearman’s rank correlation coefficient (r) = 0.61, p < 0.001), followed by bone resorption (r = 0.58, p < 0.001) and chronic inflammatory infiltrate (r = 0.52, p < 0.001). In multivariable analysis, reduced osseointegration (adjusted Odds Ratio (OR) = 4.76, p < 0.001), bone resorption (adjusted OR = 4.12, p < 0.001), chronic inflammatory infiltrate (adjusted OR = 3.26, p = 0.003), history of periodontal disease (adjusted OR = 2.74, p = 0.005), and smoking (adjusted OR = 2.18, p = 0.030) were significant independent predictors of biologically mediated implant failure.
Conclusion
Dental implant failure was predominantly associated with peri-implantitis and impaired osseointegration. Histopathological evidence of inflammation, bone resorption, and reduced osseointegration was strongly associated with clinical severity. Periodontal disease history and smoking were also significant clinical predictors of biologically mediated failure, emphasizing the importance of periodontal and risk-factor assessment in implant therapy.