术前CBCT测量HU值与后牙区常规种植体初期稳定性及二期手术需求的相关性研究OA

Objective:To investigate the correlation between bone mineral density Hounsfield Unit(HU)values measured by preoperative cone beam computer tomography(CBCT)and primary stability as well as the need for secondary surgery of conventional implants in the posterior dental region,define the quantitative early warning interval of HU values for the need for secondary surgery.Methods:The clinical data of 62 patients who received single conventional implant placement in the posterior dental region in our hospital from March to September 2025 were retrospectively analyzed.The patients were divided into groups according to whether secondary surgery was required after implantation.Multiple statistical methods were used to analyze the correlation between HU values in different segments and the need for secondary surgery,and the receiver operating characteristic(ROC)curve was adopted to determine the critical value and early warning interval of HU values.Re-sults:HU values in all segments of the group requiring secondary surgery were significantly lower than those of the group without secondary surgery(P<0.001),and the HU values at the implant root showed the strongest correlation(r=-0.712).Mean HU values and the maxillary posterior dental region were independent predictors for the need for secondary surgery(P<0.05).The area under the curve(AUC)of mean HU values for predicting the need for secondary surgery was 0.897,with the optimal critical value of 1250 HU.Implant brand and specification had no significant effect on the need for secondary surgery(P>0.05).Conclusion:HU values measured on preoperative CBCT can predict the primary stability of dental implants and the need for secondary surgery in the posterior dentition,with apical HU values showing the best predictive performance.The established grading warning threshold for HU values,combined with the high-risk characteristics of the posterior maxilla,can guide intervention strategies.Adjusting implant brand or dimensions shows no significant benefit under low HU conditions.