الفهرس 
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Abstract
The study was carried to evaluate and compare the effect of immediate socket shield insertion technique and delayed implant placement technique on the supporting structures of two conventional implants retaining lower complete overdenture.
Twelve patients with completely edentulous maxillary arch while mandibular arch was either edentulous (for six patients) or had bilateral standing canines indicated for extraction (for six patients). six of them have only lower canines indicated for extraction were selected from the outpatient clinic, removable prosthodontics department, Faculty of Dentistry, Ain Shams University to participate in this study.
Patients were precisely selected and thoroughly examined in an attempt to reduce human variables and eliminate any factor that might adversely affect the results of this study.
Patients were rehabilitated by mucosa supported maxillary complete denture and two implant retained mandibular overdenture following the two stage surgical technique. According to the presence of or absence of the bilateral canines and technique of implant placement,the patients were divided into two equal groups.
group one:: Patients of this group were rehabilitated by implant retained mandibular overdenture with two immediate implants following the socket shielding technique for the bilateral canines.
group two: Patients of this group were be rehabilitated by implant retained mandibular over denture with two delayed placed implants in the interforaminal region.
Standard clinical and laboratory techniques were followed for denture construction for all patients. Patients were frequently recalled for inspection and post insertion adjustments. Follow up visits were scheduled at time of implant loading, six, and twelve months after loading for making radiographic records required to evaluate the implant marginal bone height changes.Marginal bone height change around the implants was evaluated using the linear measurement system supplied by the CBCT.
Results obtained from this study showed statistically significant decrease in peri-implant bone height for the two studied groups at the end of the one year follow up period.
group (two) patients (delayed implant placement technique) scored a significant decrease of crestal bone height at the interval from zero to twelve months follow up period.