Retention and stress distribution induced in mandibular implant-retained complete overdenture with different interimplant distance (An In-Vitro study).

Objective: The loss of retention or adjustment of overdentures was the most commonly reported complication type in the dental office. So, this study was aimed to evaluate the retention and stress distribution induced in implant-retained overdenture with different inter- implant distance in vitro study. Materials and Methods: Six implant-retained overdenture models were fabricated on acrylic models with two screwed implants at three-different interimplant distances (19 mm, 23 mm, and 29 mm) to measure the overdenture retention using digital force gauge as well as to the stress distribution around the dental implant using strain gauge with unilateral load application at the second premolar, first molar, and the second molar sites. Results: The results of the retention test, revealed no statistically significant difference among the tested groups. While the strain results showed a statistically significant difference between all tested groups. Conclusion: The smaller interimplant distance could improve the retention of the overdenture as well as it could allow better stress distribution around the dental implants.