[Evaluation of three-dimensional changes after sinus floor augmentation with DBBM].

PURPOSE: The objective of present study was to assess the dimensional stability of the grafting material DBBM (Bio-oss) after maxillary sinus floor augmentation with spiral computed tomography (SCT) scans and 3D reconstruction.

METHODS

Two postoperative SCT scans were available from 12 patients who had undergone maxillary sinus lift procedures. CT scan was taken at 2 week after surgical intervention and 6 months later, respectively. A total of 12 maxillary sinuses were augmented with 100% DBBM before implant insertion by lateral antrostomy in a staged approach. The augmentation volume was calculated using the SurgiCase CMF5.0 software. Data were calculated by Stata10 software package.

RESULTS

The mean volume of the graft was reduced by 19.40%. Specifically, the reduction reached 0.29% in the buccal-palatal direction, 5.87% in the mesial-distal dimension, and 14.32% in vertical dimension.

CONCLUSIONS

This study confirmed that the volume of DBBM has a certain amount of reduction within 6 months after sinus floor augmentation. The reduction in vertical direction is most severe.