Purpose of the study: our study was to assess the clinical outcome of both Silastic and Medpor as chin alloplastic augmentation procedures. Material and Methods: This randomized clinical study was performed on ten patients with retruded chin with a mean age of 25 years, out of whom 6 received silastic chin implant and 4 received Medpor chin implant. The primary clinical outcome variable was patient satisfaction after application of silastic or medpor chin graft depending on Genioplasty Outcome Evaluation (GOE). Other variables in this study were surgical time, postoperative pain score, and postoperative chin edema. Results: ten patients underwent the protocol of the study .They were 5 males and 5 females. 6 patients received a Silastic Chin graft and 4 patients received a Medpor Chin graft The Overall patient satisfaction outcome and GOE, data were recorded pre-surgical and at 6 months with the postoperative follow-up. The presurgical GOE score for all patients who received silastic chin graft 35.19±8.7and medpor chin graft were 33.17±9.0 . GOE after 6 months were 74.56±7.2 for patients who received silastic chin graft . and 76.66±8.2 for patients who received medpor chin graft(P-value = 0.0001).Conclusions: Both Silastic and Medpor alloplastic chin implants can be used as a simple technique of chin augmentation in moderate chin retrusion .All the patients in the study showed significant improvement in chin profile with a high degree of satisfaction according to Genioplasty Outcome Evaluation.