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The Effect of Time Elapsed after Posterior Tooth Extraction on Maxillary Sinus Floor Pneumatization: A CBCT Study
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N Anbiaee    , Sh Reyhani Shirvan , SS Raeiszadeh Langrodi , F Goudarzi * |
| 2.Department of Oral and Maxillofacial Radiology, School of Dentistry, Hormozgan University of Medical Sciences, Bandar Abbas, I.R.Iran. , dr.f.godarzi@gmail.com |
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Abstract: (29 Views) |
Background and Objective: The posterior maxilla is considered one of the most challenging regions for dental implant placement. Sinus pneumatization following the extraction of posterior maxillary teeth is a significant contributor to this challenge. This study aimed to evaluate the effect of the time elapsed since posterior maxillary tooth extraction on the degree of maxillary sinus floor pneumatization, using cone-beam computed tomography (CBCT) images.
Methods: This longitudinal quantitative study included all patients who had two CBCT scans obtained over a four-year interval and who had at least one posterior maxillary tooth extracted between the scans. A total of 39 teeth were evaluated. In both baseline and follow-up CBCT images, the vertical distance between a tangent line drawn along the nasal floor and the lowest point of the maxillary sinus floor was measured at precisely corresponding locations to assess the extent of sinus pneumatization. Measurements were categorized according to tooth region (second premolar, first molar, second molar) and the presence or absence of sinus proximity on pre-extraction images. Based on the time elapsed since tooth extraction, patients were classified into three groups: less than 4 months, less than 8 months, and more than 8 months. Changes in sinus pneumatization were compared among these groups. Intra-observer reliability was assessed by re-evaluating the images at least 15 days after the initial evaluation.
Findings: The results demonstrated a statistically significant increase in sinus pneumatization after tooth extraction, with a mean increase of 0.34±0.33 mm (p<0.001). The mean increase in sinus pneumatization was 0.25 mm within the first 4 months, 0.32 mm within 8 months, and 0.46 mm after more than 8 months following extraction. Greater pneumatization was observed in the second molar region (0.44±0.41 mm compared with 0.28±0.30 mm; p=0.660) and in teeth with closer proximity to the maxillary sinus (0.38±0.30 mm compared with 0.31±0.36 mm; p=0.303); however, these differences were not statistically significant.
Conclusion: According to this of this study indicate that maxillary sinus pneumatization increases significantly after tooth extraction relative to pre-extraction values, particularly in the early months after extraction, and subsequently continues at a slower rate over time. The mean increase in sinus pneumatization was greater in teeth whose roots were in close contact with the maxillary sinus. |
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| Keywords: Maxillary Sinus, Cone-Beam Computed Tomography, Tooth Extraction, Dental Implants. |
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Type of Study: Dicscriptive |
Subject:
Dentistry (Radiology)
Received: 2024/08/30 | Accepted: 2025/01/25
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