Retrospective Cohort Study: Five-Thread Guideline for Predicting Dental Implant Stability in Fresh Extraction Sites

Predicting primary implant stability in fresh extraction sites remains a challenge for clinicians. Accurate forecasting is vital to guide treatment decisions and build strong doctor-patient relationships by clearly communicating success probabilities. This retrospective cohort study evaluates the 5-thread guideline (5-TG), which posits that engaging at least 5 implant threads in native bone ensures high primary stability. Among 150 cases analyzed, the 5-TG demonstrated significant predictive accuracy (p < .0000207), suggesting a reliable framework for assessing stability probabilities: none, low, moderate, or high. The 5-TG is a valuable tool for planning dental implants in newly extracted sites.