Using oral implantology software and transferring the preoperative planning into a stereolithographic model, prosthodontists can produce the related surgical guide. This procedure has some disadvantages: bonesupported stent invasiveness, lack of references due to scattering and nonnegligible stereolithography cost. An alternative solution is presented that provides an ideal surgical stent (not invasive, precise, and cheap) as a result. This work focuses on the third phase of a fully 3D approach to oral implant planning, that starts by CT scanning a patient who wears a markers-equipped radiological stent, continues exploiting preoperative planning software, and finishes producing the ideal surgical template. A 5-axes bur-equipped robot has been designed able to reproduce the milling vectors planned by the software. Software–robot interfacing has been achieved properly matching the stent reference frame and the software and robot coordinate systems. Invasiveness has been avoided achieving the surgical stent from the mucosa-supported radiological mask wax-up. Scattering is ignored because of the surgical stent independency from the bone structure radiography. Production cost has been strongly reduced by avoiding the stereolithographic model. Finally, software–robot interfacing precision has been validated comparing digitally a multi-marker base and its planning transfer. Average position and orientation errors (respectively 0.283mm ± 0.073mm and 1.798° ± 0.496°) were significantly better than those achieved using methods based on stereolithography (respectively, 1.45mm ± 1.42mm and 7.25° ± 2.67°, with a general best maximum translation discrepancy of about 1.1 mm). This paper describes the last step of a fully 3D approach in which implant planning can be done in a 3D environment, and the correct position, orientation and depth of the planned implants are easily computed and transferred to the surgical phase.
From Implant Planning to Surgical Execution: an Integrated Approach for Surgery in Oral Implantology
CHIARELLI, Tommaso;LAMMA, Evelina;SANSONI, Tommaso
2012
Abstract
Using oral implantology software and transferring the preoperative planning into a stereolithographic model, prosthodontists can produce the related surgical guide. This procedure has some disadvantages: bonesupported stent invasiveness, lack of references due to scattering and nonnegligible stereolithography cost. An alternative solution is presented that provides an ideal surgical stent (not invasive, precise, and cheap) as a result. This work focuses on the third phase of a fully 3D approach to oral implant planning, that starts by CT scanning a patient who wears a markers-equipped radiological stent, continues exploiting preoperative planning software, and finishes producing the ideal surgical template. A 5-axes bur-equipped robot has been designed able to reproduce the milling vectors planned by the software. Software–robot interfacing has been achieved properly matching the stent reference frame and the software and robot coordinate systems. Invasiveness has been avoided achieving the surgical stent from the mucosa-supported radiological mask wax-up. Scattering is ignored because of the surgical stent independency from the bone structure radiography. Production cost has been strongly reduced by avoiding the stereolithographic model. Finally, software–robot interfacing precision has been validated comparing digitally a multi-marker base and its planning transfer. Average position and orientation errors (respectively 0.283mm ± 0.073mm and 1.798° ± 0.496°) were significantly better than those achieved using methods based on stereolithography (respectively, 1.45mm ± 1.42mm and 7.25° ± 2.67°, with a general best maximum translation discrepancy of about 1.1 mm). This paper describes the last step of a fully 3D approach in which implant planning can be done in a 3D environment, and the correct position, orientation and depth of the planned implants are easily computed and transferred to the surgical phase.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
