Introduction: The success of implant therapy depends primarily on appropriate treatment planning and properly performed implant placement surgery.Guided implant surgery (template based guided cavity preparation and guided implant insertion) is effective to guide the implant placement.This can be achieved by means of a surgical guide Stent.Stents are designed in conventional methods or stereolithography which allows the fabrication of surgical guides from 3D computer generated models for precise placement of the implants.
Objectives: Assess the accuracy of stereolithographic surgical stent to orientate implant insertion in mandibular free-end saddle areas.
Materials and methods: A total of 12 implants will be placed in patients having mandibular free end- saddle areas selected from the outpatient section of the department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Alexandria University, after virtual implant planning with implant studio software, the implants will be inserted using stereolithographical  design of surgical stent then measuring the deviation between the planned implant position before the surgery and the actual position of placed implant after surgical procedure.
Results:Evaluation of the accuracy of placement was done by measuring the overall deviations between virtually planned and surgically placed dental implants.The mean of total angular difference in implant with stereolithographic stent were 10.9 ± 9.4°.While The Mean of total coronal differences in stereolithographic guided implant were 0.96 mm ± 0.7 mm.The Mean of total apical differences in stereolithographic guided implant were 1.8 ± 1.3 mm
Conclusions: The stereolithographic surgical template was sufficiently accurate in transferring the planned implant position to the surgical field relative to the implant angulation and point of entrance.