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3D Volumetric Analysis of Post-extraction Maxillary Sinus Floor Pneumatization: A Retrospective Analysis
Thursday, March 1 / 6:40 - 6:50 pm / Monitor 1

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3D Volumetric analysis of post-extraction maxillary sinus floor pneumatization: A Retrospective Analysis

Sara Elhusseini BDS, Neema Bakhshalian DDS, PhD2, Homayoun H. Zadeh DDS, PhD 

1 Advanced Periodontology Resident, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA

2 Laboratory for Immunoregulation and Tissue Engineering, Herman Ostrow School of Dentistry, University of Southern California, Los Angeles, CA, USA

Introduction :

Dimensional changes of the alveolar ridge crest following tooth extraction have been extensively studied. However, post extraction changes in the maxillary sinus floor have not been investigated. The aim of the present retrospective study was to explore changes to the maxillary sinus floor using 3D volumetric analysis

Materials and Methods : 

24 Pre- and post-operative CBCTs of 24 individuals who had maxillary molar tooth extraction at USC Ostrow school of Dentistry were included in this study. The CBCT images were imported into 3D software Called AMIRA . Pre- and post-operative CBCTS studies were segmented so that discreet volumes of the maxillary sinus and the alveolar ridge were created. The volumes of the pre-op and post-op sinus and alveolar ridge were oriented and superimposed. Cross sections were made perpendicular to the curvature of the maxillary arch in the center of each extracted tooth. These super-imposed pre-op and post-op images were utilized for two-dimensional analysis of the sinus floor changes.

 

Results : 

Examination of representative superimposed pre-op and post-op CBCT images revealed very little change in the position of the maxillary sinus floor following tooth extraction and significant dimensional changes in the alveolar ridge. This is consistent with linear measurements from 2D images reported by Hameed, et al., who have observed that the mean sinus floor vertical height changes were 0.62, 0.37, 0.4mm and the mean crestal bone height changes were 3.07, 3.33 and 2.99 in the sites of MB, DB and P maxillary molar roots, respectively. Linear measurements of superimposed pre-op and post-op CBCT 3D volumes is currently in progress.

 

Conclusions: 

•Proof of principle pilot analysis demonstrated feasibility of superimposing pre- and post-extraction alveolar  crest and maxillary sinus
•Maxillary sinus floor position at pre- and post-extraction exhibited very little positional change
•Alveolar crest exhibited severe horizontal and vertical  atrophy
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