Undergraduate Student, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
PhD Student, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil.
Implant Dent. 2018 Dec;27(6):667-671. doi: 10.1097/ID.0000000000000823.
Pixel values from cone-beam computed tomography (CBCT) are proportional to bone density. This study aimed to correlate and compare pixel values of healed maxillary sinus grafts and adjacent native bone (NB).
This study was conducted on CBCT scan patients referred for maxillary sinus floor augmentation with biphasic calcium phosphate (n = 31). Graft height and width measurements were performed. In addition, mean pixel values were calculated in 3 different regions: NB, sinus graft close to NB (CNB), and sinus graft far from NB (FNB). Micro-CT and histological analyses of bone specimens of a representative case were also performed.
Significant correlations were found between CNB and graft height (r = 0.41; P < 0.021); and FNB and graft width (r = 0.519, P < 0.003). In addition, pixel values from both graft groups (CNB and FNB) differed significantly (P < 0.001). Finally, histological sections revealed smaller areas with newly formed bone in the FNB area.
Within the limitations of this study, the present findings suggest that pixel values of sinus grafted areas are directly correlated with the extension of the grafted area.
体层摄影术（CBCT）的像素值与骨密度成正比。本研究旨在对愈合的上颌窦植骨区和相邻的天然骨（NB）的像素值进行相关性和比较。
本研究对因上颌窦底提升术而接受双相磷酸钙（n=31）治疗的 CBCT 扫描患者进行了研究。进行了植骨高度和宽度的测量。此外，还计算了 3 个不同区域的平均像素值：NB、靠近 NB 的窦腔植骨（CNB）和远离 NB 的窦腔植骨（FNB）。还对一个代表性病例的骨标本进行了微 CT 和组织学分析。
在 CNB 和植骨高度（r=0.41；P<0.021）之间，以及 FNB 和植骨宽度（r=0.519，P<0.003）之间发现了显著的相关性。此外，两组植骨区（CNB 和 FNB）的像素值有显著差异（P<0.001）。最后，组织学切片显示在 FNB 区，新形成的骨的面积较小。
在本研究的限制范围内，目前的发现表明窦腔植骨区的像素值与植骨区的扩展直接相关。
