Inclusion Criteria:  Be at least 21 years of age Be missing 1 to 2 back teeth in the lower jaw for at least three months Need horizontal bone ridge augmentation (gain width of the bone) prior to implant placement, determined clinically and radiographically Have enough bone height at the site  Exclusion Criteria:  Currently smoke more than 10 cigarettes a day (self-reported) Have any medical conditions or jaw pathology that we decide might influence the outcome of the study Are pregnant or are lactating (self-reported) Have unstable periodontal disease or other dental infection Have poor oral hygiene Have any clinical conditions that make the subject unsuitable for bone graft surgery