Quantitation of mandibular symphysis volume as a source of bone grafting.
BACKGROUND
Autogenous intramembranous bone graft present several advantages such as minimal resorption and high concentration of bone morphogenetic proteins. A method for measuring the amount of bone that can be harvested from the symphysis area has not been reported in real patients.


OBJECTIVE
The aim of the present study was to intrasurgically quantitate the volume of the symphysis bone graft that can be safely harvested in live patients and compare it with AutoCAD (version 16.0, Autodesk, Inc., San Rafael, CA, USA) tomographic calculations.


METHODS
AutoCAD software program quantitated symphysis bone graft in 40 patients using computerized tomographies. Direct intrasurgical measurements were recorded thereafter and compared with AutoCAD data. The bone volume was measured at the recipient sites of a subgroup of 10 patients, 6 months post sinus augmentation.


RESULTS
The volume of bone graft measured by AutoCAD averaged 1.4 mL (SD 0.6 mL, range: 0.5-2.7 mL). The volume of bone graft measured intrasurgically averaged 2.3 mL (SD 0.4 mL, range 1.7-2.8 mL). The statistical difference between the two measurement methods was significant. The bone volume measured at the recipient sites 6 months post sinus augmentation averaged 1.9 mL (SD 0.3 mL, range 1.3-2.6 mL) with a mean loss of 0.4 mL.


CONCLUSIONS
AutoCAD did not overestimate the volume of bone that can be safely harvested from the mandibular symphysis. The use of the design software program may improve surgical treatment planning prior to sinus augmentation.
Verdugo
Fernando
F
fverdugo@perio.org
Simonian
Krikor
K
Smith McDonald
Roberto
R
Nowzari
Hessam
H
D019412:Anatomy, Cross-Sectional; D015519:Bone Density; D016025:Bone Transplantation / Q000379:methods*; D002508:Cephalometry / Q000379:methods; D002680:Chin / Q000033:anatomy & histology* / Q000000981:diagnostic imaging / Q000601:surgery; D017076:Computer-Aided Design; D006801:Humans; D007430:Intraoperative Care; D008443:Maxillary Sinus / Q000601:surgery*; D013516:Oral Surgical Procedures, Preprosthetic; D010347:Patient Care Planning; D012984:Software; D020858:Tissue and Organ Harvesting; D014057:Tomography, X-Ray Computed