Transpositioned flap vestibuloplasty combined with implant surgery in the severely resorbed atrophic edentulous ridge

The use of transpositioned flap (lipswitch) vestibuloplasty combined with implant surgery in patients with severely resorbed atrophic edentulous ridges is reviewed. The cases of 17 patients with severely resorbed atrophic edentulous ridges at the mandible undergoing implant rehabilitation were reviewed. Lipswitch vestibuloplasty was followed immediately by the implant surgery. Postoperative follow-up consisted of clinical and radiographic examinations. Seventeen patients with atrophic ridges (12 class II and 5 class III) each had 2 implant fixtures placed in the mandible as abutments for a clip and bar overdenture. The average time of follow-up was 6 years. Before surgery, all patients had severely atrophic ridges with a compromised shallow vestibule of varying degrees. Satisfactory results were observed in regard to the immediate and long-term morphology of the vestibule, the health of the peri-implant tissue, the stability of implant fixtures, and the functionality of the prostheses. The lipswitch vestibuloplasty offers a safe and convenient method of surgical access for implant fixture installation, with the advantage of rebuilding the vestibule of a compromised atrophic ridge in the anterior mandible.     

Selective laser sintering technology for customized fabrication of facial prostheses

This article describes the use of SLS to produce a wax prototype for the fabrication of a partial nasal prosthesis. This technique may be an alternative to more conventional laboratory techniques for facial prosthesis fabrication and allows direct generation of definitive wax patterns. With the satisfying effect of nasal defect restoration, patients may be effectively rehabilitated and derive emotional and physical benefit from the treatment provided.     

微型种植钉的长度直径对生物力学的影响

目的对比评价临床常用的3种类型(不同长度、直径)微型种植钉的生物力学特点。方法应用种植钉48枚,新西兰大白兔8只。采用拉出试验,扭转强度试验,在即刻与愈合4周后进行生物力学测量。结果长度为6mm,直径为1.9mm的种植钉相对于同等长度,直径为1.5mm的种植钉在“种植后即刻”与“愈合4周”时,最大剪切力均表现出显著性优势。愈合4周后,直径为1.9mm的种植体在最大扭转强度上表现出显著性的优势。结论在骨质量较差的部位选择较大直径的种植体有利于种植体的稳定。     

头颈部恶性肿瘤患者血清可溶性白介素2受体水平

目的:研究头颈部恶性肿瘤患者血清可溶性白介素2受体(sIL-2R)水平的变化。方法:用双抗体夹心法对60例头颈部恶性肿瘤患者,60例良性肿瘤患者以及50例健康对照者的血清sIL-2R水平进行检测。结果:头颈部恶性肿瘤患者组血清sIL-2R水平显著高于健康对照组(P<0.01),而良性肿瘤患者组血清sIL-2R水平与健康对照组无统计学差异(P>0.05)。结论:血清中高sIL-2R水平可能与头颈部恶性肿瘤的发生有相关性。     

A newly designed resonance frequency analysis device for dental implant stability detection

Resonance frequency (RF) analysis technology was used to design a new dental implant stability detector. To calibrate and test the performance of this novel apparatus, in vitro and in vivo models, respectively, were used. The RF values of the test implants detected using our new device and a commercially available analogous device (Osstell) were compared. Further, implant stability status was also detected clinically using our device at 2, 4, 8, and 12 weeks after surgery. A high correlation was demonstrated between the values measured with the two devices (y = 0.31x-12.45; R2 = 0.98, p < 0.05). In our clinical tests, an initial RF value above 10.0 kHz indicated that the implant was ready to accept functional loading, while values in the 4.0-10.0 kHz range reflected the need for further osseointegration. In conclusion, these results indicated that our new device might be useful in a clinical setting for evaluating the healing status of a placed implant.     

倾斜种植体在上颌后牙区骨量不足患者中的应用

目的:探讨倾斜种植体作为一种避免上颌窦植骨的方法,应用于上颌骨后牙区骨量不足患者种植修复的可靠性。方法:2005年1月—2007年12月间,21例患者共27个固定桥修复上颌后牙缺失,分别使用ITI和Br覽nemark 2种种植系统共植入78颗种植体,其中34颗种植体采用倾斜植入,44颗轴向植入。所有患者均为上颌后牙区骨量不足无法直接接受常规种植体植入。种植体植入后常规愈合3个月,除1颗种植体失败外,其余种植体均功能性负载支持固定义齿修复,修复方式为黏结固位和螺丝固位。每例患者均于负载后12、24和36个月接受临床和放射学随访检查。采用SPSS11.0软件包对数据进行统计学处理。结果:上颌有1颗轴向种植体在术后2个月时失败,倾斜种植体无失败。随访时间为36个月。上颌轴向种植体的累积存活率为97.72%,倾斜种植体的累积存活率为100%,修复成功率为100%。随访期间,种植体周围软组织保持稳定,平均探诊深度和附着水平无明显变化。结论:倾斜种植体作为一种上颌骨后牙区骨量不足患者的治疗方法是可靠的,能有效避免植骨手术,并节约治疗时间。     

羟基磷灰石微晶体对培养骨细胞钙代谢的作用

通过体外研究，观察了三种不同浓度的羟基磷灰石（HA）微晶体悬液对骨细胞的钙代谢作用的影响。MC3T3-E1细胞和ROS细胞分别与1.5mg/ml,3.0mg/ml和4.5mg/ml的HA微晶体悬液混合培养，观察细胞的生长率。结果表明：中，低浓度的HA没有明显的细胞生长抑制作用，但高浓度的HA微晶体悬液有轻微的细胞生长抑制。各实验组的细胞内钙和细胞外钙的测定结果表明，细胞内外钙含量的变化与HA微晶体悬液的浓度有关，HA微晶体能直接作用于骨细胞的钙代谢，促进细胞的矿化作用。     

氟素制剂促进离体乳牙再矿化作用的比较研究

目的：比较3种常见氟素制剂对乳牙体外矿化的促进作用。评估其防龋效果。方法：36个乳牙，随机分为4组，开窗，酸蚀，1、2、3组分别涂布100g/L(NH4)2MoO2F4,380g/LAg(NH3)2F,APFLaCl33min，第4组作对照，随后置入5ml矿化液中，4d后检测矿化液中Ca^2 浓度，计算其变化并进行统计分析。结果：同对照组相比，3种氟素制剂处理组再矿化液中Ca^2 均显著减少，其中以APF-LaCl3组和380g/LAg(NH3)2F组减少最多，两组间无差异。但同100g/L(NH4)2MoO2F4组差别显著。结论：3种氟素制剂都可有效的促进乳牙体外再矿化，其中APF-LaCl3和380g/LAg(NH3)2F效果最佳，优于100g/L(NH4)2MoO2F4。     

干燥综合征患者唾液pH值、电解质测定的诊断意义初步探讨

目的:探讨唾液生化指标测定对初步诊断干燥综合征的临床价值。方法:分为干燥综合征病变组和正常对照组,吐取法采集混合唾液,测定唾液pH值、Na 、K 浓度,计算Na /K ,Na 、K 单位时间分泌总量。t检验统计分析。结果:干燥综合征病变组唾液Na 、K 浓度、Na /K 明显高于正常对照组,与正常对照组相比,病变组K 单位时间分泌总量明显下降,pH值显著降低。Na 浓度、Na /K 敏感性、特异性均较高,pH值特异性较高,K 单位时间分泌总量敏感性、特异性一般。结论:唾液检查是一种简便、准确、无创的检查手段,干燥综合征患者唾液pH值、电解质具有特征性,其综合评定对初步筛选干燥综合征有一定临床价值。     

Occupational exposure to mercury in dentistry and pregnancy outcome

A questionnaire was mailed to dentists and dental assistants requesting information about work, health, and reproductive history. Statistical analysis of the data indicated that there were no increased rates of spontaneous abortions or congenital abnormalities in the children of men and women who were exposed to low versus high levels of mercury in a dental environment.