Influence of Various Implant-Abutment Connection Designs on Microleakage and Bacterial Penetration

Objectives: The connection between implant and abutment establishes essential conditions for lasting success of dental implant therapy. Bacterial colonization at the implant-abutment connection causes microleakage which subsequently leads to peri-implant diseases as well as eventual implant failure. The Morse taper together with internal hexagon and external hexagon represent three implant-abutment connection designs which seek to decrease bacterial penetration. The present study examines how variations in implant-abutment connections affect both microleakage and bacterial infiltration between components. Methods: This in vitro research examined 60 titanium dental implants through three distinct connection design categories consisting of Morse taper with 20 units and internal hexagon with 20 units and external hexagon with 20 units. A bacterial exposure with Streptococcus mutans occurred on each implant-abutment unit before placing them in a 37°C environment during a seven-day period. Laboratory examination of bacterial penetration included RT-PCR tests and evaluation of bacterial cultures. A spectrophotometric analysis of dye penetration technique was employed to measure microleakage between groups. The statistical analysis employed one-way ANOVA for data assessment while post-hoc Tukey’s test provided supplemental evaluations at a p value below 0.05. Results: The Morse taper connection group demonstrated better microleakage resistance through its 0.25±0.05 mm readings when compared to the 0.67±0.08 mm readings from internal hexagon and 1.12±0.10 mm readings from external hexagon groups (p<0.05). Bacterial penetration occurred in 10% of Morse taper implants whereas 45% of internal hexagon implants presented bacterial penetration and 75% of external hexagon implants showed bacterial penetration. The Morse taper connection provided advanced sealing ability that reduced both microleakage and bacterial passage through the connection. Conclusion: Design specifications for implant-abutment connections determine how well bacterial agents and fluid can pass through the connection. Morse taper connections show enhanced sealing capabilities which lowers the chance of bacterial infections during the procedure. Clinical application of Morse taper implants should be favored because research shows they help extend implant life and decrease peri-implant bacterial infections. The research demonstrates that Morse taper connections decrease peri-implant diseases effectively because they block bacterial penetration. The clinical use of Morse taper implants should be considered when sustaining implant longevity together with controlling infection rate is essential.