昆仑雪菊水提物对KKAy小鼠血清脂联素、抵抗素、血脂的影响

目的:探讨昆仑雪菊水提物对KKAy小鼠血清脂联素、抵抗素、血脂的影响。方法:将SPF级7~8周龄雄性自发性2型糖尿病KKAy小鼠50只按体质量随机分为模型组(MC组)、昆仑雪菊低剂量组(KD组)、中剂量组(KZ组)、高剂量组(KG组)、吡格列酮组(B组),正常对照组(NC组)选与KKAy小鼠同源的C57BL/6J小鼠10只(NC组)。模型组和正常组给予0.9%氯化钠溶液,其余组给予对应浓度的药液灌胃。35天后取材测血清脂联素、抵抗素、血脂水平。结果:与模型组比较,昆仑雪菊低剂量组脂联素水平明显升高,差异有统计学意义(P0.05);昆仑雪菊不同剂量组虽比模型组抵抗素水平降低,但差异无统计学意义(P0.05);昆仑雪菊低剂量组高密度脂蛋白(HDL-C)水平提高,差异有统计学意义(P0.05),而总胆固醇(TC)、甘油三酯(TG)、低密度脂蛋白(LDL-C)水平无明显降低,差异无统计学意义(P0.05)。结论:昆仑雪菊水提物可能通过提升KKAy小鼠血清脂联素与HDL-C水平而发挥其改善胰岛素抵抗及脂代谢紊乱起作用。     

Edgwise矫治器在固定外伤松动牙中的应用

目的 寻求一种固定外伤松动乳牙或年轻恒牙的新方法。方法 43例4～14岁的66颗外伤松动牙，常规粘结托槽、方丝及结扎丝“8”字结扎固定，3个月后拆除。治疗前、治疗后1个月、2个月、3个月、半年拍摄根尖片，观察愈合情况。结果 75．7％正常愈合，15．2％根吸收，3．0％牙冠变色，3．0％牙冠变色。结论 Edgwise托槽应用于外伤松动牙的固定安全、简便、损伤小、易清洁，效果满意。     

精氨酸-天冬氨酸抗涎腺腺样囊性癌实验性肺转移的研究

目的 研究精氨酸－天冬氨酸（Arg-Asp,RD)抗涎腺腺样囊性癌实验性肺转移（salivary adenoid cystic carcinoma lung metastation,SACC-LM)的作用。方法 观察不同剂量、不同时间RD灌胃对SACC－LM的影响。结果30mg/kg和120mg/kgRD灌胃可抑制SACC－LM的形成；7．5mg/kg、30mg/kg、120mg/kgRD灌胃均可延长SACC－LM鼠的生存期。结论 RD毒性小、可经口给药，具有抗SACC－LM的作用。     

The management of parotid tumors

The majority of salivary gland tumors are of epithelial origin. Parotid gland is the most common location of the tumors. Surgery is the main modality for the management of parotid tumors. Radiotherapy, chemotherapy etc are the auxiliary modalities.     

夹层技术修复楔状缺损后牙颈部硬组织应力分析

目的 研究不同厚度复合树脂的夹层技术修复楔状缺损后,牙颈部硬组织的应力分布.方法 模拟建立下颌第一前磨牙颊舌向剖面模示图,选择3种不同厚度复合树脂的夹层技术模拟充填缺损区,采用二维有限元应力分析法,对牙颈部做应力分析.结果 随着复合树脂厚度增加,缺损附近的应力减小.复合树脂厚度由0.5mm增至0.8 mm和由0.8 mm增至1.1 mm时,缺损深部最大主应力分别减少33%和41%.结论 夹层技术修复楔状缺损,在保证玻璃离子水门汀垫底厚度的前提下,以增加复合树脂厚度为宜.     

不同排牙方法对全口义齿咀嚼效能的影响

目的:探讨不同排牙法的全口义齿咀嚼效能的异同。方法:采用上颌排牙法、下颌排牙法和综合排牙法为10名无牙颌患者分别制作3副全口义齿。戴用3个月后,通过吸光度法测定咀嚼效率,比较不同排牙法的全口义齿咀嚼效能的异同,并与有牙颌进行对比。结果:在单侧咀嚼和双侧咀嚼2种咀嚼方式下,全口义齿患者的咀嚼次数和咀嚼效能均少于有牙颌组,本实验3组全口义齿在3个月后均发挥了良好的咀嚼效能。下颌排牙法和综合排牙法全口义齿的咀嚼次数和咀嚼效能无统计学差异,但均好于上颌排牙法全口义齿。结论:下颌排牙法和综合排牙法的全口义齿排列的人工牙能够减少在咀嚼过程中不利于全口义齿稳定因素的影响,提高咀嚼效能。     

Induction of dental pulp fibroblast matrix metalloproteinase-1 and tissue inhibitor of metalloproteinase-1 gene expression by interleukin-1alpha and tumor necrosis factor-alpha through a prostaglandin-dependent pathway

Matrix metalloproteinase-1 (MMP-1) and tissue inhibitor of metalloproteinase-1 (TIMP-1) are involved in the degradation of extracellular matrix in many inflammatory diseases. Little is known regarding the expression of these mediators in dental pulp fibroblasts. The effects of proinflammatory cytokines (interleukin (IL)-1alpha and tumor necrosis factor-alpha (TNF-alpha)) and prostaglandin E2 (PGE2) on pulp fibroblast MMP-1 and TIMP-1 gene expression were investigated. Northern hybridization showed that IL-1alpha and TNF-alpha induced significant MMP-1 gene expression, with only little effect on TIMP-1 gene. Exogenous PGE2, however, upregulated TIMP-1 mRNA synthesis but not MMP-1. Concomitant addition of IL-1alpha and PGE2 or TNF-alpha and PGE2 suppressed MMP-1 mRNA production, compared with the groups treated with IL-1alpha or TNF-alpha alone. In contrast, PGE2 enhanced the upregulatory effects of TIMP-1 mRNA by IL-1alpha or TNF-alpha. Furthermore, cytokine stimulation of MMP-1 and TIMP-1 gene expressions can be enhanced or blocked by indomethacin, respectively, and reversed by exogenous PGE2. These results suggested that cytokine-stimulated MMP-1 and TIMP-1 gene expression in dental pulp fibroblasts was mediated, at least in part, by a prostaglandin-dependent pathway. The differential regulation of IL-1alpha or TNF-alpha-induced MMP-1 and TIMP-1 mRNA synthesis, as well as the direct upregulation of TIMP-1 gene expression by PGE2, also implied that prostaglandin may serve as a protective mechanism from excessive tissue breakdown during pulpitis.     

小鼠釉质发育过程中成釉器中间层细胞增殖、凋亡以及组织非特异性碱性磷酸酶的表达

目的:观察小鼠釉质发育过程中成釉器中间层细胞的增殖、凋亡和其组织非特异性碱性磷酸酶(tissue nonspecific alkaline phosphatase,TNSALP)的表达,探讨中间层在釉质形成过程中的可能作用.方法:取出生后1、3、5、7、9、11、15d的BALB/c小鼠56只,解剖分离含下颌第一磨牙区的下颌骨,脱钙,制片,HE染色进行牙釉质发育情况的组织学观察,分别采用原位末端标记法(TUNEL法)、SP免疫组织化学技术、PV二步法观察中间层细胞的凋亡及检测Bcl-2、增殖细胞核抗原(proliferating cell nuclear antigen,PCNA),并对TNSALP进行组织学定位.通过Image-pro plus 6.0图像分析软件.对图像进行半定量分析.采用SPSS13.0软件包进行t检验、单因素方差分析及SNK-q检验.结果:出生后1d.中间层细胞增殖细胞核抗原由比成釉细胞表达高的强阳性表达逐渐降低;至7d时,其表达为阴性,而且中间层细胞随釉质的发育逐渐凋亡.中间层细胞先于成釉细胞表达TNSALP,出生后5d时即呈现强阳性染色,而后其表达又逐步减弱;成釉细胞7d时开始出现阳性,且呈逐渐增强趋势.结论:中间层细胞的增殖和凋亡及其TNSALP的表达与成釉细胞具有相关性,提示中间层细胞有可能参与成釉细胞的分化及釉质形成.