Cone Beam Computerized Tomography-based Dental Imaging for Implant Planning and Surgical Guidance, Part 1: Single Implant in the Mandibular Molar Region
Computerized tomography (CT)-based dental imaging for implant planning and surgical guidance carries both restorative information for implant positioning, as far as trajectory and distribution, and radiographic information, as far as depth and proximity to critical anatomic landmarks such as the mandibular canal, maxillary sinus, and adjacent teeth. This case report describes a systematic approach to the planning and surgical placement of a single implant-supported crown, utilizing CT-based dental imaging for implant planning and surgical guidance. The simple steps result in the accurate transfer of critical radiographic information to the surgical site.Abstract

A panoramic radiograph revealed a missing lower-right second molar and impacted upper- and lower-right third molars. Figure 2. A Cone Beam CT study was performed while the patient was wearing an imaging guide with radiopaque restorative pins seen in the panoramic slice (A) and cross-section (B). These pins represent optimal prosthetically-driven access holes and trajectory for tooth No. 31. Residual bone trajectory and the mandibular canal were also used as guiding basics for implant trajectory, depth/length, and diameter. A 3-dimensional reconstruction of a patient's anatomy was achieved, and a surgical guidance template (C) was designed and computer-manufactured with a precise drilling-hole location and trajectory. Figure 3. The primary sleeve from the metal guiding sleeves system was inserted into a predetermined hole and secured by means of an adhesive to the template. Figure 4. An osteotomy and subsequent implant drilling procedure was performed utilizing the personalized template. Figure 5. The Zimmer implant, 5.7 mm in diameter and 11.5 mm long, was placed in the optimal position, considering the surrounding anatomic landmarks and the patient's occlusion. Figure 6. The final lower-right second molar porcelain fused to metal implant–supported restoration that was cemented in place.
Contributor Notes
Dov M. Almog, DMD, is in private practice limited to prosthodontics in Rochester, NY, and is a clinical associate professor in the Department of Oral Diagnostic Sciences at the University of Buffalo, School of Dental Medicine in Buffalo, NY. Address correspondence to Dr Almog at the Dental Implants and Reconstruction Center, 1960 Clinton Avenue South, Rochester, NY 14618.
James LaMar, DMD, and Frank LaMar, DDS, are in private practice limited to dental implants in Rochester, NY.
Frank R. LaMar, DDS, is in private practice limited to prosthodontics in Rochester, NY, and is a clinical assistant professor in the Division of Prosthodontics at the University of Rochester Eastman Dental Center, Rochester, NY.