Photographs and standardized reproducible intraoral digital radiographs were obtained from each operated site. The film holder was modified by placing a registration material (Optosil®) on the bite blocks to index the dentition. A paralleling cone technique (7mA-60kV/20ms) was used. A radiopaque millimeter grid was positioned over the radiograph to assess the radiographic measurements. Both the occlusal stent and the radiographic bite blocks with the millimeter grid provided a well-defined and reproducible measurement at each defect and at each examination time point