Purpose: To evaluate the adherence of three types of bacteria [Staphylococcus (S) aureus,

Escherichia (E) coli, Pseudomonas (Ps) aeruginosa] and the size of the microgap of three

different implant systems (JD, ORA, and Ankylos) under four different screw torque values.

Materials and Methods: Ten samples for each tested implant system were used under different

torques to determine the width of the gaps. The abutments were connected to the fixtures using a

universal digital wrench. A torque value of 10 N/cm was applied for all samples. After the

assessment of the microgap, the fixture was repositioned into the Bench Vice, and the torque was

increased to 20, 30, and, finally, 40 N/cm. The microgap assessment was done using a Scanning

Electron Microscope. Before the torque increased to 40, eleven samples for each tested implant

system were used under 30 N/cm torque to determine the leakage in the tested implants for S.

aureus, E. coli, and Ps. aeruginosa. Data were analyzed with multiple one-way ANOVA, Post

Hoc, and chi-square tests. Results: The Ankylos system showed the widest gap under all torques

(p < 0.005), whereas the JD system demonstrated the lowest (p < 0.005). Regarding the bacteria

leakage, JD showed the highest adherence to the bacteria, and the adherence was mainly to the

Ps. Aeruginosa, while the Ankylos system showed the lowest (p < 0.005). Conclusion: Within

limits, the higher torque provides a higher fit to the IAI, offering more stability. Ankylos implant

showed the widest gap, while JD showed the narrowest. Regarding the bacteria leakage, JD

showed the highest adherence to Ps. Aeruginosa, while the ORA system showed the highest

adherence to E. coli.