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KMID : 0602720130170040246
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Implantology
2013 Volume.17 No. 4 p.246 ~ p.257
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Height and Width of Edentulous Maxillary Posterior Alveolar Ridge
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Kim Ha-Young
Ku Young
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Abstract
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Purpose: The objective of this study is to analyze the cone-beam computed tomography (CBCT) scanned images for preoperative assessment of implantations in edentulous maxillary posterior alveolar ridge and to identify the relationships of performed surgical procedures.
Materials and Methods: The patients are respectively selected among those examined by CBCT in Seoul National University Dental Hospital between October 2012 and August 2013. A total of 117 patients are being included in this study: 67 males and 50 females. The average age of males is 50.4±10 and of females, 53.1±12.3. The specific cross sectional view that displays the center of planned implantation is selected as a section of interest (SOI). For each SOI, the height is being measured parallel to the long axis of the alveolar ridge from the alveolar crest to the sinus floor. The width is being measured perpendicular to the long axis for every 1 mm-interval of the axis. We have also surveyed the correlation between surgical techniques that are used in implantation fixtures and the dimension of edentulous ridges.
Results: The average height of the first premolar, the second premolar, the first molar, and the second molar areas are 12.58, 9.63, 5.79, and 5.92 mm, and the heights of those which did not reach 10 mm are 37.5%, 64.0%, 81.2%, and 88.8% at each area, respectively. The average width of the area that was 3-mm above the crest in the first premolar, the second premolar, the first molar, and the second molar areas are 7.48, 8.13, 10.19, and 11.50 mm, and the widths of those which did not exceed 6 mm are 25% 19%, 2%, and 1% at each area, respectively. Additionally, 83.3% of maxillary molar areas require bone augmentation procedures due to height deficiencies in the performed surgical procedures.
Conclusion: From this study, we have identified that 84.8% of cases require bone augmentation procedures for implantations in maxillary molar areas. It is also suggested that it is essential to assess the preoperative state thoroughly based on the three-dimensional diagnostic images such as CBCT. Additionally, we confirm that simultaneous implantations are actively performed in the case of low alveolar bone heights where delayed implantations have been recommended.
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KEYWORD
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alveolar ridge dimension, cone-beam computed tomography, maxillary posterior area, sinus floor elevation
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