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目的 探讨一种前方牵引器口内固位装置的改良设计 ,并对用以矫治前牙反牙合所引起的牙颌面形态学变化进行评估。方法 选择 1 2名年龄 8.5~ 1 2岁前牙反牙合的患者 ,应用改良前方牵引器进行上颌前方牵引。牵引前后分别拍摄头颅侧位X线定位片 ,行X线片头影测量 ,测量结果进行统计学处理。结果 前牙覆盖增加 6 .5 5mm ,上齿槽座点A点平均前移 2 .6 0mm ,下颌骨位置后移 5 .6 5mm ,下颌平面角平均增加 1 .70°,上、下颌骨间位置关系明显改善。结论 改良的前方牵引器口内固位装置制作简单、固位良好、患者戴用舒适、易清洁 ,临床应用可明显改善前牙反牙合患者的面型。 相似文献
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目的:观察前方牵引矫治器对骨性III类错[牙合] 矫治的作用效果。方法:对13例骨性反牙合患者采用前方牵引器进行矫治,比较治疗前后的临床效果以及头影X线测量结果。结果:13名骨性反牙合患者矫治后的侧面外观改善,前牙正常覆牙合、覆盖关系以及后牙中性关系重新建立。治疗前后SNA和ANB角度有显著性差异(P〈0.05)。结论:前方牵引矫治器可以促进上颌骨同时抑制下颌骨向前发育,调整上下颌骨位置关系,对骨性III类错牙合的早期治疗有良好的矫治效果。 相似文献
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目的:应用改良固定反式双阻板矫治器(Twin-block appliance,TBA)联合前牵治疗AngleⅢ类骨性前牙反[牙合],综合评价其临床应用效果。方法:矫治骨性前牙反[牙合]15例,对治疗前后临床表现及X线硬组织测量进行分析,并与单纯反式TBA组及前牵组进行比较。结果:经过3~5个月的治疗,患者侧貌外型明显改善,反覆盖、覆[牙合]纠正。结论:反式TBA联合前牵引是矫治前牙反[牙合]的理想装置,对上下颌骨影响均较大。 相似文献
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目的:评价面具式前方牵引矫治器治疗儿童骨性Ⅲ类错牙合临床效果。方法:选取2010~2013年就诊于新疆医科大学第二附属医院利用面具式矫治器进行矫治的19例(男12例,女7例)儿童骨性Ⅲ类错牙合患者的矫治前与矫治结束时头颅侧位片和模型,并测量SNA、SNB、ANB、SND、Wits、U1-L1、FMA、SN-MP、SN-PP、U1-SN、IMPA、NLA、ULP、LLP、上面高、下面高、上颌模型牙弓宽度(前段、中段、后段),比较其矫治前后的变化。结果:所有患者都进行了前方牵引6个月,SNA、ANB、Wits值、U1-L1、FMA、SN-MP、SN-PP、上面高、下面高、IMPA、NLA、LLP、上颌模型后段、下颌长度,比较其治疗前后,差异有统计学意义,SND、U1-SN、SNB、ULP、上颌模型前段、上颌模型中段比较其矫治前后无统计学意义。结论:使用前方牵引矫治器治疗儿童早期骨性Ⅲ类错牙合可以刺激上颌骨的生长,同时使上下颌骨呈顺时针旋转,但对下颌骨生长的抑制作用不明显。 相似文献
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目的 评价改良式导弓矫治器治疗乳牙期功能性前牙反(牙合)的临床疗效.方法 选取20例乳牙期功能性前牙反(牙合)患者,均采用改良式导弓矫治器进行治疗,矫治前后拍摄头颅侧位片,并进行X线头影测量分析.结果 蝶鞍点-鼻根点-上齿槽座点构成的角(SNA)增加(0.35±1.12)°,蝶鞍点-鼻根点-下齿槽座点构成的角(SNB)减少(2.53±0.91)°,上齿槽座点-鼻根点-下齿槽座点构成的角(ANB)增加(2.88±2.24)°,上乳中切牙长轴与前颅底平面的交角(UI-SN)增加(0.66±1.16)°,下乳中切牙长轴与下颌平面的交角( LI-MP)减少(2.89±2.13)°,前牙反(牙合)全部解除;面凸角增加(3.32±2.14)°,全面凸角减少(3.46±2.63)°,患者侧貌由Ⅲ类凹面型变为直面型.结论 改良式导弓矫治器可以有效解除乳牙期功能性前牙反(牙合),协调上下颌骨前后向的位置关系,改善患者软组织侧貌. 相似文献
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目的:对比研究双曲舌簧(牙合)垫矫治器增加舌刺装置与不增加舌刺装置矫治替牙期前牙反(牙合)伴吐舌不良习惯的临床矫正效果.寻找矫治替牙期前牙反(牙合)矫治的最佳矫治方案.方法:选取临床上就诊的6~10岁的替牙期前牙反(牙合)伴吐舌不良习惯的患者40例,随机分为两组,每组20例,分别采用双曲舌簧(牙合)垫矫治器增加舌刺装置... 相似文献
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目的:应用改良固定反式双阻板矫治器(Twin-block appliance,TBA)联合前牵治疗I5例AngleⅢ类轻、中度骨性前牙反[牙合],进行颞颌关节方面研究,以期从颞颌关节适应性改建来探讨其作用机制。方法:测量分析治疗前后颞下颌关节中位断层片变化情况,并与前牵引组及反式TBA组进行比较。结果:未发现一例患者出现TMD症状。联合组治疗前后线性百分比分别为24.67%和11.62%,N/M值治疗前后分别为1.82和1.07,A值及P值变化均较明显,关节前间隙增大,后间隙减小。联合组及反式TBA组髁突发生明显后下移位,前牵引组变化较小。结论:适当持续性矫治力不会对颞颌关节产生不利影响。联合组全天作用引起颞颌关节适应性改建,前牙反锁结的快速解除并结合将前伸的髁突、下颌诱导后退,有利于恢复和建立后牙正常的ICP,真正实现牙位、肌位、关节位的协调一致,此对于矫治前牙反[牙合]、防止复发具有重要意义。 相似文献
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目的:应用改良固定反式双阻板矫治器(Twin-block appliance,TBA)联合前牵治疗AngleⅢ类轻.中度骨性前牙反[牙合],进行肌电研究,探讨在矫治过程中咀嚼肌功能活动的变化规律,以期从咀嚼肌适应性改建来探讨其作用机制。方法:调查颞肌前束(TA)、咬肌(MM)、二腹肌前腹(DA)治疗前、中、后肌电活动变化情况。结果:矫治后姿势位TA.DA、MM肌电值(MCV)明显下降;反[牙合]时下颌前伸位TA及DA存在异常的肌电活动,在治疗后均明显降低;治疗前后退位MM、TA及DA肌电活动与对照组相比均较大,具有显著性差异,治疗结束后明显下降;反[牙合]解除后紧咬及双侧咀嚼运动MM、TA及DA肌电水平明显增加。结论:反式TBA联合前牵全天作用可引起神经肌肉的适应性改建。 相似文献
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J Lilja M M?ller H Friede C Lauritzen L E Petterson B Johanson 《Nordisk plastikkirurgisk forening [and] Nordisk klubb for handkirurgi》1987,21(1):73-79
Our results of bone grafting to the alveolar process during the mixed dentition were investigated in 55 consecutively treated patients (66 clefts). The amount of remaining bone and gingival retraction at the tooth mesial to the cleft after 3 and 12 months was measured and correlated with the following anatomical conditions present during surgery: width of the cleft, rotation of the adjacent incisor, stage of eruption of the tooth distal to the cleft. It was also considered if any deciduous lateral incisor or canine was extracted during surgery and if any flap dehiscence took place postoperatively. It was found that flap dehiscence resulted in significantly less bone at 3 months and at 1 year after surgery. Furthermore, extraction of a deciduous tooth was found to be significantly correlated to less bone 1 year after surgery, in which cases there were also persisting gingival retractions. The other factors had no significant influence on the outcome of surgery. 相似文献
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H Friede M M?ller J Lilja C Lauritzen B Johanson 《Nordisk plastikkirurgisk forening [and] Nordisk klubb for handkirurgi》1987,21(1):65-71
Cephalometric radiographs and dental study casts were analyzed in a group of 23 seven-year-old cleft lip and palate patients, 16 with unilateral and 7 with bilateral cleft. The patients' primary surgical procedures had been completed except for closure of the cleft in the hard palate. For comparison, similar records from another group of patients, 18 with unilateral and 8 with bilateral cleft lip and palate, were studied. In these cases the cleft of the hard palate had been repaired in infancy, using a vomer flap procedure. The results indicated that midfacial growth and dental occlusion of the unilateral cleft sample was significantly better in patients whose closure of the hard palatal cleft had been delayed to the stage of mixed dentition than where repair had been performed with a vomer flap in infancy. No differences were found, however, between similar subgroups with bilateral cleft lip and palate. 相似文献
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目的 对比早期或晚期行关节镜下前交叉韧带(anterior cruciate ligament, ACL)重建的临床疗效。方法 选取2015年1月至2016年11月在我院进行关节镜下单束自体腘绳肌腱重建手术治疗ACL的34例病人进行回顾性分析。其中伤后2周内进行重建手术治疗的17例纳入早期重建组,伤后2~6个月内进行重建治疗的17例纳入晚期重建组,对比两组病人的术后疼痛消除时间、肿胀消除时间和关节恢复正常活动的时间等一般临床指标,收集并比较其术前和术后18个月的Lysholm评分、术前国际膝关节文献委员会(the international knee documentation committee, IKDC)膝关节评分。结果 两组病人的手术时间、术中出血量比较,差异均无统计学意义(P均>0.05);早期重建组的术后疼痛消除时间、肿胀消除时间和关节恢复正常活动时间分别为(34.06±3.27) d、(13.71±2.36) d和(50.18±4.65) d,均显著高于晚期重建组的[(25.29±3.96) d、(9.29±2.91) d和(33.41±3.48) d]差异均有统计学意义(t=7.033,t=4.850,t=1.892,P均<0.001);术后18个月,早期重建组的Lysholm评分和IKDC评分分别为(89.00±5.83)分、(90.06±5.03)分,与晚期重建组的(90.94±5.55)分、(91.47±4.23)分相比,差异均无统计学意义(P均>0.05),且两组病人Lysholm量表各单项评分之间的差异也无统计学意义(P均>0.05)。结论 早期或晚期关节镜下单束自体腘绳肌腱重建手术治疗膝关节ACL损伤的近期临床疗效相近,但晚期重建治疗病人的术后恢复较快。 相似文献
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缺氧早期大鼠心肌细胞微管损害的观察 总被引:1,自引:1,他引:1
目的 了解缺氧早期心肌细胞微管损害程度。方法将分离培养的Wistar大鼠心肌细胞分为正常组、缺氧组(建立缺氧细胞模型并设缺氧10、20、30、60min为观察时相点)。用激光共聚焦显微镜及扫描电镜观察2组细胞微管分布、形态变化,对微管蛋白荧光强度进行半定量分析.用蛋白质印迹法检测2组细胞游离d微管蛋白的表达。结果 与正常组比较,缺氧10min后,缺氧组细胞微管念珠状结构消失,但排列尚有规律、数量无明显减少;缺氧20min不仅念珠状结构消失,而且微管排列散乱,远离胞核区出现微管缺失;缺氧30、60min时微管发生扭曲、断裂,纹理紊乱,完全丧失规律性。缺氧组心肌细胞微管蛋白荧光强度较正常组下降,且随缺氧时间延长愈加明显;缺氧组心肌细胞内游离的α微管蛋白表达(缺氧10min为46644±145)高于正常组(13357±98),两组比较,差异有统计学意义(P〈0.01),随缺氧时间的延长此升高趋势愈加明显。结论在缺氧状态下,心肌细胞微管发生解聚时间较早,其结构和分布规律被破坏。微管解聚在缺氧所致心肌细胞早期病理损害中的作用值得深入研究。 相似文献
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Increased apoptosis at the late stage of tendon healing 总被引:1,自引:0,他引:1
Pauline Po Yee Lui PhD ; Yau Chuk Cheuk BSc ; Leung Kim Hung MD ; Sai Chuen Fu MPhil ; Kai Ming Chan MD 《Wound repair and regeneration》2007,15(5):702-707
The mechanism for the clearance of excess healing fibroblasts at the end of tendon healing has not been reported despite the importance of maintaining tissue homeostasis. This study investigated the role of apoptosis in cell turnover in a rat central 1/3 patellar tendon donor site injury model. At days 4, 7, 14, 28, months 2 and 6, the rats were killed. Patellar tendons without injury served as control. Apoptotic cells were determined by an in situ terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling (TUNEL) assay and anti-active caspase-3 antibodies, while proliferating cells were determined by anti-proliferating cell nuclear antigen antibodies. The total fibroblast-like cell density in the center of the wound increased from day 4 and thereafter steadily returned to normal. In situ TUNEL assay showed few positive staining cells in the wound at days 4 and 7. The percentages of TUNEL-positive fibroblast-like cells showing morphological characteristics of apoptosis increased sharply and reached the maximum on day 28 (median %: 31.38%). No fibroblast-like cell was stained at month 6 and the healed tissue was similar to that in a normal uninjured tendon. A similar trend was observed with active caspase-3 immunohistochemistry. In conclusion, an increase in apoptosis at the end of tendon healing coincided with a decrease in cellularity. 相似文献
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Surgical indications and timing in serious cases (Hunt and Hess grades 4 and 5) of intracranial aneurysms were investigated. The outcomes in early surgery were compared to the clinical courses of cases intended for late surgery. The survival rate of early surgery patients was 64.4%, better than the total of improved (28.3%) and survived (6.5%) patients for late surgery. There were 28.8% good outcomes in the early surgery group, compared to 2.2% in those treated late. Both of these figures are statistically significant. We consider that early surgery is indicated for serious cases, but not for grade 5 patients with hematoma. 相似文献
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目的探讨高氧平衡盐溶液在家兔吸入性损伤早期的治疗效果及其作用机制. 方法将77只家兔随机分为4组正常组(5只),不致伤;平衡盐溶液治疗组(24只),致伤后连续10 d补充平衡盐溶液;高氧液治疗组(24只),致伤后连续10 d补充高氧平衡盐溶液;对照组(24只),致伤后不治疗.致伤的3组家兔又于伤后1、2、3、5、7、10 d 6个时相点下观察,每时相点4只.观察各组兔呼吸情况及生存率,检测其动脉血气分析、白细胞及分类、肺湿干重比、肺组织丙二醛(MDA)含量、超氧化物歧化酶(SOD)活性,观察肺组织的病理改变. 结果各致伤组兔伤后立即出现呼吸频率增快、张口呼吸、鼻翼扇动、咳嗽频繁,口、鼻腔分泌物增多,肺部可闻及干、湿性啰音.伤后10 d,对照组、平衡盐溶液治疗组、高氧液治疗组兔生存率分别为13.3%、27.8%、65.6%.血气分析结果均显示为代谢性酸中毒.各致伤组各时相点二氧化碳分压、白细胞、中性粒细胞、肺湿干重比、肺组织MDA等指标均较正常组升高,其顺序为对照组>平衡盐溶液治疗组>高氧液治疗组>正常组;而pH值、氧分压、SOD等指标均较正常组降低,其顺序为对照组<平衡盐溶液治疗组<高氧液治疗组<正常组(P<0.05).肺组织病理结果显示,家兔伤后肺体积明显增大,光镜下可见肺组织结构呈炎性改变,高氧液治疗组肺部损伤的范围及程度均较其他致伤组明显缩小或减轻. 结论早期应用高氧平衡盐溶液,对治疗吸入性损伤有明显的疗效. 相似文献
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血清胱抑素C(Cys C)是近年来一种用以评价肾小球滤过率(GFR)、反映肾功能变化的内源性标记物.因其自身不受性别、肌肉量、恶性肿瘤等因素的影响及在机体内能够恒定表达等特点,被认为是评价GFR的理想指标之一.本文主要论述Cys C在临床各种肾脏疾病中的应用及研究进展,旨在评价其在早期肾功能损害中的临床意义. 相似文献
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关于防治烧伤后早期脓毒症的思考 总被引:15,自引:7,他引:8
改进液体复苏方法、应用局部抗菌药物、早期去除坏死组织及时有效地覆盖创面、对肠道细菌移位的认识和保护肠道等措施已在严重烧伤的治疗中被推广。现今,严重烧伤患者脓毒症发生概率显著降低,但治疗尚无突破性进展,死亡率无明显下降,仍为严重烧伤患者的主要死亡原因,也是增 相似文献