第三届国际口腔粘接技术大会简报

由中华口腔医学会主办,第四军医大学口腔医学院承办的第三届国际口腔粘接技术大会于2008年9月26至28日在西安隆重召开.     

纯钛膜治疗颅骨局部骨缺损的动物实验研究

目的：评价国产无孔纯钛膜引导兔顶骨区局部骨缺损的骨再生修复效果。方法：在8只大白兔的左右顶骨区建立骨缺损，一侧覆盖钛膜，另外一侧作为对照侧。随机分成4周组和8周组。进行肉眼、直接数字化X线影像及硬组织切片组织学观察。结果：对照侧骨缺损的面积减小、但中央区缺损未愈合，纤维组织修复；而实验侧骨缺损均骨性愈合。结论：钛膜有非常好的生物相容性，阻挡软组织长和骨缺损区内，并较好维持骨再生修复空间，保证骨缺损修复。     

高压蒸气骨移植的组织形态学研究

作者用SD系大白鼠28只,分为实验组(16只)和对照组(12只),实验组将大白鼠头顶骨部分切除,用高压蒸气处理后再植回原位;对照组将切除的骨不作任何其他处理再植回原位.术后用光学显微镜和扫描电镜进行组织形态学观察,结果显示;实验组自术后1周开始有新骨形成,和对照组相同.4周时新骨形成最旺盛,移植骨大部被新生骨取代.8周时宿主骨和移植骨完全是骨性连接.结果表明:高压蒸气骨是一种具有良好生物相容性和骨传导能,并有一定机械强度的骨移植材料.     

Endoscopic esophageal tumor length

BACKGROUND:

Pathologic esophageal tumor length (pL) is an independent predictor of long‐term survival. However, whether patients with longer (high‐risk) tumors can be identified by endoscopy before surgery has not been established. The objective of the current study was to determine the value of endoscopically measured tumor length (cL) in predicting overall survival in patients with esophageal adenocarcinoma.

METHODS:

All patients with esophageal adenocarcinoma who had undergone resection without neoadjuvant therapy and who had documented preoperative endoscopy findings were identified retrospectively by using prospectively collected databases at 2 institutions: The University of Texas M. D. Anderson Cancer Center (n = 164; training set) and University of Rochester Medical Center (n = 109; validation set). Esophageal tumors were assessed preoperatively by endoscopy for cL, depth (cT), and lymph node involvement (cN). Univariate and multivariate analyses of cL and other standard prognostic factors were performed.

RESULTS:

In the training set, cL was correlated directly with pL (Pearson correlation [r] = 0.683; P < .001). Regression tree analyses suggested an optimum cutoff point of cL >2 cm to identify patients with decreased long‐term survival (5‐year survival rate: cL >2 cm, 29%; cL ≤2 cm, 78%; P < .001). Multivariate Cox regression analysis demonstrated that cL >2 cm was an independent risk factor for long‐term survival (hazard ratio, 2.3; 95% confidence interval, 1.1‐4.4; P = .02) even after controlling for age, cT, and cN. Validation with the validation dataset confirmed that cL was correlated directly with pL (r = 0.657; P < .001) and predicted long‐term survival using a cL cutoff point of >2 cm (hazard ratio, 2.8; 95% confidence interval, 1.4‐5.8; P = .004; univariate analysis).

CONCLUSIONS:

Endoscopic esophageal tumor length was identified as an independent predictor of long‐term survival and may help to identify high‐risk patients before they receive cancer‐directed therapy. Cancer 2011. © 2010 American Cancer Society.     

Removal of overhanging amalgam: A comparative study of three instruments

This study compared the effects on tooth surface of three power-driven instruments commonly used to remove overhanging amalgam. Comparisons of methods of instrumentation were made on enamel, cementum, and amalgam. Cavitron, Roto Pro, and EVA system instruments were used. Findings showed significantly more abrasion on all surfaces in EVA groups compared with other groups. All surfaces in Roto Pro groups appeared to be smoother than in other groups. There appeared to be little difference between treated surfaces and control surfaces in the Cavitron group.