前牙区即刻种植短期临床研究

目的探讨前牙区即刻种植临床疗效。方法对28例因外伤、牙周病、龋病、乳牙滞留等原因拔除前牙的患者,即刻植入32颗Ankylos种植体,种植体与拔牙窝缺隙大于2 mm时,在间隙内填塞人工骨粉或于种植位点附近获取少量骨屑与人工骨粉拌合填塞缺隙,唇侧骨板有缺损或明显裂纹者应用骨引导再生技术。6个月后行烤瓷冠修复。随访3～12个月。结果随访期间32颗种植体均无松动,X线片观察种植体颈部边缘骨吸收均小于0.2 mm。结论严格掌握适应证,保证种植体良好的初期稳定性,前牙区行即刻种植能够获得良好的临床效果。     

Comparison of immediate complete denture, tooth and implant-supported overdenture on vertical dimension and muscle activity

PURPOSE

To compare the changes in the occlusal vertical dimension, activity of masseter muscles and biting force after insertion of immediate denture constructed with conventional, tooth-supported and Implant-supported immediate mandibular complete denture.

MATERIALS AND METHODS

Patients were selected and treatment was carried out with all the three different concepts i.e, immediate denture constructed with conventional (Group A), tooth-supported (Group B) and Implant-supported (Group C) immediate mandibular complete dentures. Parameters of evaluation and comparison were occlusal vertical dimension measured by radiograph (at three different time intervals), Masseter muscle electromyographic (EMG) measurement by EMG analysis (at three different positions of jaws) and bite force measured by force transducer (at two different time intervals). The obtained data were statistically analyzed by using ANOVA-F test at 5% level of significance. If the F test was significant, Least Significant Difference test was performed to test further significant differences between variables.

RESULTS

Comparison between mean differences in occlusal vertical dimension for tested groups showed that it was only statistically significant at 1 year after immediate dentures insertion. Comparison between mean differences in wavelet packet coefficients of the electromyographic signals of masseter muscles for tested groups was not significant at rest position, but significant at initial contact position and maximum voluntary clench position. Comparison between mean differences in maximum biting force for tested groups was not statistically significant at 5% level of significance.

CONCLUSION

Immediate complete overdentures whether tooth or implant supported prosthesis is recommended than totally mucosal supported prosthesis.     

Computed tomography-guided implant surgery for dental rehabilitation in mandible reconstructed with a fibular free flap: description of the technique

The fibular free flap, with or without a cutaneous component, is the gold standard for reconstructing mandibular defects. Dental prosthetic rehabilitation is possible this way, even if the prosthesis-based implant is still a challenge because of the many anatomical and prosthetic problems. We think that complications can be overcome or reduced by adopting the new methods of computed tomography (CT)-assisted implant surgery (NobelGuide, Nobel Biocare AB, Goteborg, Sweden). Here we describe the possibility of using CT-guided implant surgery with a flapless approach and immediate loading in mandibles reconstructed with fibular free flaps.     

注射用甲泼尼龙琥珀酸钠致速发型超敏反应22例分析

摘 要 目的：探讨注射用甲泼尼龙琥珀酸钠所致速发型超敏反应的一般规律及特点,为临床合理用药提供参考。方法: 采用回顾性研究方法,分析22例应用甲泼尼龙琥珀酸钠致速发型超敏反应的患者资料,对其临床表现、影响因素、治疗和转归等进行探讨。结果: 甲泼尼龙琥珀酸钠所致的速发型超敏反应从用药后30 s至用药后24 h内皆可发生,22例中有18例出现在用药30 min内,构成比为81.82%,主要累及皮肤、呼吸、消化、循环、神经系统或器官,以皮肤反应最为常见,严重者可致过敏性休克,须停药并积极治疗。结论: 临床应重视甲泼尼龙琥珀酸钠所致的速发型超敏反应,尤其是合并使用其他药物过程中,以免延误诊治。     

A Biomechanical Comparison of Fiberglass Casts and 3-Dimensional–Printed,Open-Latticed,Ventilated Casts

Background: The aim of this study was to quantify the stabilizing properties of a 3-dimensional (3D)-printed short-arm cast and compare those properties with traditional fiberglass casts in a cadaveric subacute distal radius fracture model. Methods: A cadaveric subacute fracture model was created in 8 pairs of forearms. The specimens were equally allocated to a fiberglass cast or 3D-printed cast group. All specimens were subjected to 3 biomechanical testing modalities simulating daily life use: flexion and extension of digits, pronation and supination of the hand, and 3-point bending. Between each loading modality, radiological evaluation of the specimens was performed to evaluate possible interval displacement. Interfragmentary motion was quantified using a 3D motion-tracking system. Results: Radiographic assessment did not reveal statistically significant differences in radiographic parameters between the 2 groups before and after biomechanical testing. A statistically significant difference in interfragmentary motion was calculated with the 3-point bending test, with a mean difference of 0.44 (±0.48) mm of motion. Conclusions: A statistically significant difference in interfragmentary motion between the 2 casting groups was only identified in 3-point bending. However, the clinical relevance of this motion remains unclear as the absolute motion is less than 1 mm. The results of this study show noninferiority of the 3D-printed casts compared with the traditional fiberglass casts in immobilizing a subacute distal radius fracture model. These results support the execution of a prospective randomized clinical trial comparing both casting techniques.     

侧脑室与腰大池联合置管引流治疗脑室内铸型血肿临床疗效分析

目的：对比分析侧脑室与腰大池联合置管引流与单纯侧脑室置管引流治疗脑室内铸型血肿的疗效。方法回顾性对比分析本科2008年7月~2013年6月期间收治的75例脑室内铸型血肿患者临床资料,随机分为两组, A组（治疗组）39例,行侧脑室与腰大池联合置管引流术;B组（对照组）36例,单纯行侧脑室置管引流术。两组术后均常规予尿激酶定时脑室灌注,血肿引流超过95%以上拔管,引流管留置7 d以上患者均予抗生素定时脑室冲洗预防感染。使用SPSS11.0软件进行统计学处理。结果 A组患者有效率82.05%,血肿清除时间5~11 d,平均7.2 d;B组患者有效率69.44%,血肿清除时间6~14 d,平均10.8 d。两组比较差异有统计学意义（P〈0.05）。术后颅内感染率、脑积水发生率A组均低于B组,差异有统计学意义（P〈0.05）。结论侧脑室与腰大池联合置管引流治疗脑室内铸型血肿效果优于单纯侧脑室置管引流,并可以减少颅内感染及脑积水并发症的风险。