Research Paper
Imaging
Simulation of sinus floor augmentation with symphysis bone graft using three-dimensional computerized tomography

https://doi.org/10.1016/j.ijom.2010.04.005Get rights and content

Abstract

The objective of this study was to evaluate the maximum amount of harvestable bone graft in the mandibular symphysis and the augmentation volume needed for different sinus lift levels (from 10 to 18 mm), in addition to calculating which sinus lift level can be acquired using the individual's symphysis bone graft volume with three-dimensional computerized tomography (3D CT) and software. Data from 15 CT scans was obtained from 15 adult patients (10 males, five females). The CT data, in DICOM format, was read into Mimics software from Materialize (Leuven, Belgium), with a slice thickness of 0.5 mm. The mandibular symphysis bone graft volumes and different levels of sinus lift augmentation volumes were calculated on the 3D images using Mimics software. It was determined that the average symphysis bone volume (3491.08 ± 772.12 mm3) could provide approximately 14 mm of sinus lift height (3167.84 ± 1067.65). 3D CT techniques and software can be used to calculate the required graft volume for sinus floor augmentation and symphysis bone graft volume, and the mandibular symphysis region can provide adequate bone volume for sinus lift augmentation.

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Material and methods

Data from 15 head and neck CT scans acquired from 15 adult patients (10 males, five females) taken for various reasons was used in this study. Patients who had maxillary sinus or mandibular symphysis pathology that could prevent size and volume calculations were excluded from the study. CT was performed with a 16-detector-row CT scanner (Aquillon; Toshiba Medical Systems, Tokyo, Japan) during one breath hold (16–24 s). Scans were obtained with 16 × 0.5-mm collimation, 0.5-mm slice thickness, 120 kV

Results

The average bone volume calculated from the mandibular symphysis was 3491.08 ± 772.12 mm3. The average calculated augmentation volume for an augmentation height of 10 mm was 1665.49 ± 657.18 mm3; for an augmentation height of 18 mm, the average volume required was 5057.73 ± 1619.36 mm3. It was determined that the amount of bone volume that can be harvested from each patient's symphysis could be enough to raise the sinus floor height 12 mm in one patient, 13 mm in five patients, 14 mm in two patients, 15 mm in

Discussion

Maxillary sinus enlargement and insufficient residual bone often require augmentation procedures before dental implant placement. After the sinus lift operation was introduced in 1980, the technique became widely accepted as a routine method to increase bone volume before implant placement12. It should be taken into account that the grafted volumes may adapt considerably in shape and volume due to repneumatisation of the maxillary sinuses12.

Although allogenic, xenogenic and alloplastic

Competing interests

None declared.

Funding

None.

Ethical approval

Not required.

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