This research aims to investigate the influence of alveolar ridge preservation, after extraction of maxillary posterior teeth, on the potential need of sinus floor augmentation procedures (that include lateral or crestal sinus augmentations). From peri-apical radiographs, maxillary posterior teeth will be divided into 4 groups according to the relationship of their apexes with the sinus. Then, the patients will be divided into 2 sub-groups: unassisted socket healing (only extraction) and ARP group (extraction + ARP) and their CBCT scans before implant placement will be collected. The CBCT scans should be at least 4 months post-extraction and ARP. Depending on the residual bone height, patients will be divided into 3 categories, according to the ABC classification:
1. In need of lateral sinus floor augmentation 2. In need of crestal sinus floor augmentation 3. No need for sinus floor augmentation, therefore, implant placement.
These divisions will be conducted, according to:
\- The residual bone height (RBH) which is the height in mm from the alveolar ridge crest to the lowest point of the maxillary sinus floor.
The results of the proposed hypothesis are verified and interpreted after statistical analysis.
• Patients aged ≥18 years.
Patients who underwent alveolar ridge preservation after extraction of maxillary posterior teeth, as a test group.
Patients who underwent extraction of maxillary posterior teeth with unassisted socket healing without alveolar ridge preservation as a control group.
• The presence of a clinically symptomatic periapical radiolucency, acute abscesses, or chronic sinus tract, that may falsify the classification of posterior maxillary teeth on 2D radiographs.
Patients who underwent extraction of posterior maxillary molars at the Saint Joseph University of Beirut's dental center, having underwent alveolar ridge preservation or not.
Cohort
Other
Alveolar ridge preservation using bony biomaterials
Procedure/SurgeryAfter extraction of posterior maxillary molars, teeth who underwent alveolar ridge preservation are included. This includes the extraction, curettage of the socket with a curette to eliminate any granulation tissue, and then the grafting of a bone material into the socket
6
Treatment groupsSee each treatment group below.
Mid-ridge height in mm
on CBCT scans taken 4-12 months after extraction (with alveolar ridge preservation or not), mid ridge height will be measured in mm according to the ideal implant position; that will be planned on BlueSky Bio software
need for either lateral sinus floor elevation, transcrestal sinus floor elevation or simple implant placement.
according to the residual bone height, the needed procedure will be divided into 3 types following the ABC classification by Wang et al. 2008
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