Methods: The current experimental research was implemented using photo elastic method with wide variety of implant width including 3.3,3.7,5,6, 3.5 mm and similar length equal to 10 mm. Plexiglass block with the same length and height of 33.5 and 35 mm and different width of implant were prepared so as there would be 1.5 mm width around each implant. They were placed under the force of 157 and 65 N in 90 and 30 degree angles respectively by photo elastic device. The obtained images were assimilated using Photoshop 650 x 760 and evaluated by image.
Results: Using the image J software colored analyzed images were obtained. The analysis procedure was based on three color (red –white –blue) separation technique. Three color separations resulted in a more investigation of spots which later categorized into stress focused, stress free and modest stress groups. The highest amount of stress focus was associated to 6 mm depth, 30 degree angle and under 100 N force with partial fraction of ¼ or 25/100 and the lowest amount of stress focus was associated with 3.7 mm depth, 90 degree angle and under the N force.
Conclusions: With the increase of implant depth from 3.2 to 5 mm, the stress amount of adjacent bone decreased and with increase in stress occurred. In the case of using higher depth, the optimum depth seems to be 5 mm.