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The Effect of Time Elapsed after Posterior Teeth Extraction on Maxillary Sinus Floor Pneumatization Using CBCT Images
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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: (290 Views) |
Background and Objective: The posterior maxilla is one of the most challenging areas for implant placement, and sinus pneumatization following the extraction of posterior maxillary teeth is a primary cause of this difficulty. The objective of this study is to evaluate the effect of time elapsed after posterior teeth extraction on maxillary sinus floor pneumatization using Cone Beam Computed Tomography (CBCT) images.
Methods: In this longitudinal quantitative study, data related to all patients who had two CBCT images taken approximately 4 years apart, with at least one posterior tooth extracted between the two CBCT scans, were collected. In total, 39 teeth were examined. In the initial and secondary radiographs, the vertical distance from the line tangent to the nasal floor to the lowest point of the sinus was measured at exactly the same points to assess the degree of pneumatization. These measurements were reported based on the dental region (second premolar, first molar, second molar) and connection or lack of connection to the sinus in the pre-extraction images. Based on the time elapsed after tooth extraction, patients were classified into three categories: less than four months, less than eight months, and more than eight months, and pneumatization changes were compared among them. Intra-observer reliability was calculated by re-scoring the patients after a minimum of 15 days.
Findings: The results showed that after tooth extraction, the degree of pneumatization significantly increased with a mean value of 0.34±0.33 mm (p<0.001). The mean level of increase in pneumatization was 0.25 mm over 4 months post-extraction, 0.32 mm over 8 months, and 0.46 mm after more than 8 months. The mean increase in pneumatization was greater in the region of the second molar tooth (0.44±0.41 mm compared to 0.28±0.30 mm, p=0.660) and in the region of teeth closer to the sinus (0.38±0.30 mm compared to 0.31±0.36 mm, p=0.303); however, these differences were not statistically significant.
Conclusion: Based on the results of this study, post-extraction sinus pneumatization showed a significant difference in the initial months compared to pre-extraction, continuing at a slower rate thereafter. The mean increase was greater in teeth with roots contacting the sinus. |
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| Keywords: Maxillary Sinus, CBCT, Tooth Extraction, Dental Implant. |
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Full-Text [PDF 560 kb]
(41 Downloads)
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Type of Study: Dicscriptive |
Subject:
Dentistry (Radiology)
Received: 2024/08/30 | Accepted: 2025/01/25 | Published: 2026/04/18
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