Prior Tooth Mobility and Furcation Involvement Are Associated With Higher Dental Implant Failure Rates: A...

Area of Science:

• Dental Implantology
• Periodontology
• Oral Surgery

Background:

• Severe tooth mobility and advanced furcation involvement are clinical indicators of compromised periodontal support.
• The long-term impact of these pre-existing conditions on dental implant survival is not fully elucidated.

Purpose of the Study:

• To compare the long-term survival rates of dental implants placed in compromised sites versus control sites.
• To assess the association between pre-operative severe tooth mobility or advanced furcation involvement and implant failure.

Main Methods:

• Retrospective cohort study analyzing multi-university dental implant patient records.
• Categorization of implants based on pre-extraction site history: Mobility Class (M2, M3) and Furcation Grade (G3, G4).
• Propensity score matching (1:4 ratio) to balance baseline covariates between risk and control groups.

Main Results:

• Analysis of 3925 matched implants (785 risk, 3140 control) over 10 years.
• Significantly lower implant survival in all risk groups compared to the 98.9% control group survival.
• Adjusted hazard ratios for failure ranged from 2.3 (M2) to 4.5 (G4), indicating increased risk in compromised sites.

Conclusions:

• Pre-extraction history of severe tooth mobility or advanced furcation involvement is a significant predictor of long-term dental implant failure.
• These clinical signs likely represent markers for severe localized bone loss and heightened periodontitis susceptibility.
• Careful risk assessment and treatment planning are crucial for implants in sites with these historical indicators.