创伤致家兔颞下颌关节滑膜和软骨超微结构的改变

目的研究创伤对家兔颞下颌关节滑膜和软骨的影响。方法采用实验性创伤动物模型，透射电镜下观察创伤后颞下颌关节滑膜和软骨的超微结构特征。结果髁突软骨表层结构破损，软骨层不同程度的软骨细胞变性、坏死。滑膜内膜层滑膜细胞变性，胞质内可见大量的空泡和近胞膜处的小泡，微丝增多、密集；细胞膜上可见微绒毛突起；内膜下层出现类“蚓状小体”结构；并首次描述了滑膜内膜层滑膜细胞之间的点粘连连接方式。结论创伤确实可以导致颞下颌关节的退行性改变。     

64排螺旋CT灌注诊断涎腺肿瘤的临床应用研究

目的:评价64排螺旋CT灌注成像对涎腺肿瘤的临床诊断价值。方法:29例涎腺部肿瘤(腮腺22例,颌下腺6例,舌下腺1例;其中良性肿瘤17例,恶性肿瘤12例)行CT灌注检查,取得相应的灌注参数:血流量(blood flow,BF),血容量(blood volume,BV),平均通过时间(mean transit time,MTT)和表面渗透性(permeability surface,PS),并均经术后病理证实。结果:所有肿瘤的BF、BV、MTT和PS值明显高于正常涎腺组织(P<0.05),恶性肿瘤组BF、BV、PS值高于良性肿瘤组(P<0.05),MTT参数则在良、恶性肿瘤之间无统计学差异。结论:涎腺肿瘤的CT灌注成像是一种较为准确的定量分析肿瘤血流灌注状态的方法,具有较高的临床应用价值。     

Double-layer porcelain veneers: effect of layering on resulting veneer color

STATEMENT OF PROBLEM: Densely sintered aluminum oxide veneered with feldspathic porcelain seems to be a promising technology for the fabrication of porcelain laminate veneers, which provide both strength and esthetics. To effectively use this approach for porcelain veneers, practitioners should know how the resulting color is affected by adding a layer of veneering porcelain onto the aluminum oxide. PURPOSE: This study compared changes in CIE L*a*b* color coordinates of simulated stained teeth when covered with the aluminum oxide core disks alone and after the disks had been veneered with 3 different shades of porcelain. MATERIAL AND METHODS: Fifteen aluminum oxide disks were divided into 3 groups. Each of 5 disks was veneered with porcelain of the Vita shades A1, A2, and B4, respectively. The colors of the substrate covered with the nonveneered disks and the veneered disks were measured separately, and the color differences were calculated. Measurements of the disks on a white background were also performed and used as controls. The extracted data were compared with Vita shade values available from the literature. RESULTS: Statistically significant differences in color coordinates of dark substrates were recorded between the substrate covered by an aluminum oxide disk and the addition of veneering porcelain to the aluminum oxide disks. Veneering the aluminum oxide disks with A1, A2, and B4 porcelain produced significant differences in the resulting color when placed on a dark substrate. The direction of the color modifications correlated with values obtained from the literature. The resulting color was also affected by the color of the underlying structures. CONCLUSION: Although aluminum oxide alone does have a degree of masking capability, the resulting color of porcelain veneers with the use of this material can successfully be modified with the veneering porcelain.     

Oral health care system in Chinese Mainland

The purpose of this review is to describe the training of dental professionals and to give an overview of the oral health care system in Mainland China. It may be of interest and importance for American readers to become aware that there are alternative practice structures and the world is getting smaller.     

口腔肿瘤患者手术后早期应用肠内营养的临床观察

目的观察口腔肿瘤手术后早期应用肠内营养对患者营养状况的影响。方法选择口腔肿瘤患者60例,随机分为早期肠内营养(earlyenteralnutrition,EEN)组和传统肠内营养(traditionenteralnutrition,TEN)组,每组30例。EEN组手术后12~16h给予能全力行营养支持,TEN组于肠道排气后经口进食。分别测定术前及术后营养相关指标。结果EEN组术后住院天数及术后8d体质量、氮平衡、血浆白蛋白、前白蛋白、视黄醇结合蛋白和淋巴细胞总数等均明显优于TEN(P<0.05)。结论口腔肿瘤患者手术后早期应用肠内营养,能较好的满足患者的营养需求,可改善术后营养状况。     

带控制阀种植牙手术骨粉收集器的研制及临床应用

目的 介绍自行研制的带控制阀种植牙手术骨粉收集器,并观察其临床应用效果.方法 选取2008年5月至2009年10月38例牙种植患者,应用自制的骨粉收集器收集种植窝制备时产生的骨碎屑,并将其用于修复种植体周围骨缺损,其中开窗式骨缺损29处,唇颊(舌)侧种植体颈部角形缺损23处.结果 所有病例术后均无创口感染及裂开,原缺损处局部形态饱满,牙龈无明显退缩,X线片示种植体与周围牙槽骨形成良好的骨结合.结论 应用自制骨粉收集器收集的骨粉修复种植体周围小型骨缺损效果良好,使用方便,具有良好的应用前景.

Abstract：

Objective To introduce a self-developed bone collector designed by the authors and evaluate its effect in clinical application. Methods A self-developed bone collector was used in 38 patients who underwent the dental implant operation from May 2008 to October 2009. During the operation the bone particles were harvested, which was used for the reconstruction of the bone defects around the implant simultaneously. The defects were fenestrate in 29 regions and triangle in 23 regions on buccal or lingual side of the dental implants. Results All cases had no surgical wound infection and dehiscence 7-10 days after operation. Three to six months after implantation, the X-ray showed that all the dental implants had perfect osseointergration and the alveolar bone were successfully augmented. Conclusions Bone debris harvested by self-developed bone collector could repair small peri-implant bone defects, which is simple to use in clinic.     

Familial multiple odontogenic keratocysts

Multiple odontogenic keratocysts (OKCs) are principle features of nevoid basal cell carcinoma syndrome (NBCCS; Gorlin-Goltz syndrome). NBCCS is a genetic disorder transmitted by an autosomal dominant gene with variable expressivity, which is important to recognize when a patient has multiple OKCs. The cysts of the jaws are among the most common findings. Another feature is a certain appearance of the face, such as: large calvaria, high-arched eyebrows, broad nasal root, and mild hypertelorism. Before-therapy diagnosis is, therefore, as important as after-therapy diagnosis. Genetic counseling and examination may also be indicated. The purpose of this paper was to present a family case report of nevoid basal cell carcinoma syndrome with multiple odontogenic keratocysts. The features identified by these combined clinical, imaging, and histologic findings are described, along with a brief mention of the family history and a review of the literature.     

Angiographic study of osteosarcoma and fibrosarcoma of the jaw

It has been well known that the sarcomas of jaw are very vascularized, but reports on the angiography of jaw sarcomas were very few. Based on the preoperative angiography of 3 cases of jaw bone sarcomas and arteriography of their specimens, it has been noticed that the supplying arteries of the mandible ramus sarcoma can be directly from the external carotid arteries; and the supplying arteries can be from inferior alveolar artery in sarcomas of the body of mandible. The tumors are more vascularized than the surrounding normal tissues, and the direction of the arteries can be from central to peripheral in the tumors, which are different from the long bone sarcomas. The vascularization and the retarded blood flow in the tumor are the significant anatomic bases for local perfusion chemotherapy of jaw sarcomas.