 Purpose: The goal of guided bone augmentation is to provide an alveolar ridge of sufficient dimension to permit dental implant placement. While a wide variety of bone graft and barrier membrane products are commercially available, limited evidence exists supporting the use of one technique over another. The purpose of this study is to radiographically define the dimensional bone changes following horizontal bone augmentation using a synthetic GUIDOR Sunstar, Inc. membrane. Secondary outcome measurements will include the assessment of inflammation, infection, or other wound healing complications. 