Aim: This study aimed to evaluate the effect of different definitive impression techniques for the resorbed mandibular ridge on the retention of lower complete dentures. Materials and methods: Ten completely edentulous male patients with severe atrophic mandibular ridge were selected from the Prosthodontic Department's outpatient clinic, Faculty of Dentistry, Sinai University (Kantara branch). Each patient received four dentures. Dentures were divided into four groups according to the type of final impression, Group I: Conventional impression techniques (open mouth technique), Group II: Cocktail impression techniques, Group III: Modified functional impression technique, and Group IV: Wire impression technique. Each denture was used for one month and at the end of the month the retention test was carried out and the results were tabulated and statistically analyzed. Results: There is a statistically significant difference between the groups. The results also showed that the highest mean value was in group IV, whereas the lowest mean value of retention was in group I. Conclusion: Wire impressions produce lower dentures with higher retention, whereas conventional impressions produce lower dentures with the lowest retention, so it is considered to be more advantageous. Clinical significance: The wire impression technique is superior in the management of resorbed ridges as compared with other techniques.