title: [Computer-assisted implant restoration of free-end partially edentulous mandible with severe vertical bone deficiency].
abstract: OBJECTIVE
  To evaluate the applicability, accuracy and clinical outcome of the computer assisted design and computer assisted manufacture (CAD & CAM) tooth-supported implant surgical guide in the mandibular free-end partially edentulous patients with insufficient vertical bone height.
  
  
  METHODS
  According to the inclusion criteria, 3 patients (2 women, and 1 man) with the mean age of 45 years (from 44 to 46 years) with 10 implant sites were involved in this study. With the help of Computer-assisted-design software to plan and simulate the surgical strategies, the implant surgical guides were fabricated via the rapid prototyping technique, then the guided implant placement was implemented, finally the post-surgical evaluations were accomplished by the clinical and radiographic examinations.
  
  
  RESULTS
  Ten implants were placed in 3 mandibles via the surgical guides, and the implant supported non-split restorations were in place. All the implant restorations revealed good clinical function until the last review. No inferior alveolar nerve injury was detected by the clinical neurosensory test. The immediate post surgical CBCT was performed to confirm a safe distance of 1.5 to 3.0 mm between the implant apical and the nerve canal. The deviations between the planed and the actually placed implant were: coronal deviation (0.84±0.30) mm (0.31-1.24 mm); apical deviation (1.42±0.52) mm (0.52-2.36 mm); angular deviation 7.65°±1.84° (4.43°-9.81°).
  
  
  CONCLUSIONS
  In case of distal free-end partially edentulous with insufficient vertical bone height in the posterior mandibular region, computer assisted surgical design and guided surgery can offer a treatment option with minimal invasiveness and a shorter treatment period, and avoid the complicated bone augmentation procedure and the high risk of nerve transposition. This technique is clinically and technically feasible, but the cases using this technique should be strictly selected according to the indication.
authors.affiliation: Center of Dental Implantology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Xi
authors.initials: X
authors.lastname: Jiang
authors.affiliation: Center of Dental Implantology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Ye
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Center of Dental Implantology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Xiu-lian
authors.initials: XL
authors.lastname: Hu
authors.affiliation: Center of Dental Implantology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Ping
authors.initials: P
authors.lastname: Di
authors.affiliation: Center of Dental Implantology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Luo
authors.affiliation: Center of Dental Implantology, Peking University School and Hospital of Stomatology, Beijing 100081, China.
authors.forename: Jian-hui
authors.initials: JH
authors.lastname: Li
mesh_terms: D000328:Adult; D017076:Computer-Aided Design; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D005260:Female; D006801:Humans; D007575:Jaw, Edentulous; D008297:Male; D008334:Mandible; D008875:Middle Aged; D012984:Software; D025321:Surgery, Computer-Assisted; D016388:Tooth Loss
chemical_list: D015921:Dental Implants