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拔牙对照
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  extraction control
     To normal rats, the BMD of mandibles in low stress sides were lower than the high stress sides 3 months after extraction( P <0.05), but the BMD of the two sides were not significantly different to those of the non extraction control ones( P >0.05).
     对于正常大鼠 ,在拔牙 3个月时 ,低应力侧下颌骨骨量显著低于高应力侧 (P <0 .0 5 ) ,但它们与非拔牙对照组的差异均无显著性。
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  “拔牙对照”译为未确定词的双语例句
     N and Tb. Sp of the high stress sides were similar to those of the non-extraction control mandibles(P> 0.05 ).
     N均比高应力侧及同期非拔牙对照组显著偏低 ,Tb .
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     Methods One hundred and ten cases of patients with impacted wisdom teeth were divided into two groups, fifty-five cases in the experimental group were extracted by high speed turbine bodkin, other fifty-five cases in the control group were extracted by the chisels.
     方法将110例下颌阻生智齿的病人,随机分成实验组和对照组,实验组的55例病人用高速涡轮钻拔牙,对照组的55例病人用凿骨、劈冠、增隙法拔牙。
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     Group A: all molars were extracted and all incisors were sheared. Group B: only upper jaw molars were extracted and upper jaw incisors were sheared. Group C:no tooth was extracted or sheared as control.
     54只鼠龄70d的雌性SD大白鼠,随机分为拔除全口磨牙和剪断全部切牙组(A组)、拔上颌磨牙和剪断上颌切牙组(B组)、不拔牙对照组(C组)。
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  相似匹配句对
     Patients of control group were only given conventional nursing of tooth extraction.
     对照组只采用常规拔牙护理。
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     (G)normal control;
     G ,正常对照 ;
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     F, as control.
     F,对照组。
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     53 patients of control group underwent dental extraction with local anaesthesia only.
     对照组51例,仅在局部麻醉下拔牙
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     (3) fearing pulling out the teeth;
     (3)怕拔牙
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  extraction control
A mock extraction control was included throughout the tissue lysis and PCR.
      
Extraction control was performed with an extracted mock sample, and the reagent control was a 100-,ul PCR with no sample added.
      
The extraction control was required to produce a negative result after PCR.
      
The sample extraction control consisted of sterile MilliQ water subjected to the same extraction procedures as the specimens.
      
While our elemental extraction control helps here, even small subsets of the data approach 100 MB.
      


Objective To observe the relationship between the change of stress environment of mandibles and their bone mass in normal and ovariectomized(OVX) rats. Methods The high and low stress environment models of mandibles were established by unilateral maxillary molars extraction. The masticatory sides of the mandibles were regarded as the high stress sides and the non masticatory sides were regarded as the low stress sides. Ovariectomized rats were utilized as postmenopausal osteoporosis models and Sham ovariectomized(Sham...

Objective To observe the relationship between the change of stress environment of mandibles and their bone mass in normal and ovariectomized(OVX) rats. Methods The high and low stress environment models of mandibles were established by unilateral maxillary molars extraction. The masticatory sides of the mandibles were regarded as the high stress sides and the non masticatory sides were regarded as the low stress sides. Ovariectomized rats were utilized as postmenopausal osteoporosis models and Sham ovariectomized(Sham OVX) rats as control group. According to these ideas, 48 female rats were divided into 4 groups: 1)OVX+extraction group; 2)OVX+non extraction group; 3)Sham OVX+extraction group; 4)Sham OVX+non extraction group. The bone mineral densities(BMD) of all mandibles were measured by single photon absorptiometry bilaterally 1.5 months and 3 months after extraction. Results The mandibles of ovariectomized rats had lower BMD than those of normal rats( P <0.05). To normal rats, the BMD of mandibles in low stress sides were lower than the high stress sides 3 months after extraction( P <0.05), but the BMD of the two sides were not significantly different to those of the non extraction control ones( P >0.05). To ovariectomized rats, the BMD of mandibles low stress sides were much lower than the high stress sides( P <0.01). The BMD of mandibles in low stress sides were much lower than non extraction ones of OVX group after 3 months( P <0.05). The BMD of the high stress sides were much higher than those of the non extraction control ones of OVX group( P <0.05), but they were still lower than those of the non extraction control ones of Sham OVX group( P <0.05). Conclusion The results indicate that the masticatory functions(the high stress environment) tend to conserve the mandibular bone mass in patients with systemic osteopenia such as postmenopausal osteoporosis and the masticatory deficiency(the low stress environment) tends to aggravate mandibular bone loss induced by systemic osteopenia. The masticatory functions should be rehabilitated for these patients as early as possible.

目的 观察双侧卵巢切除 (去势 ) (ovariectomy ,OVX)大鼠下颌骨应力环境改变与下颌骨骨量的关系。方法 拔除大鼠右侧上颌全部磨牙 ,使咀嚼侧 (左 )、非咀嚼侧 (右 )下颌骨分别处于相对的高低应力环境中 ;利用去势手术 (OVX)模仿绝经后骨质疏松症 (postmenopausalosteoporosis)。依此将48只雌性大鼠分为 4组 :①OVX +拔牙组 ,②OVX +非拔牙组 ,③Sham OVX(假去势 ) +拔牙组 ,③Sham OVX +非拔牙组。在实验 1.5个月和 3个月时应用单光子骨密度仪对各组大鼠下颌骨双侧进行骨密度测量。结果 去势大鼠下颌骨骨量显著低于正常对照组大鼠 (P <0 .0 5 )。对于正常大鼠 ,在拔牙 3个月时 ,低应力侧下颌骨骨量显著低于高应力侧 (P <0 .0 5 ) ,但它们与非拔牙对照组的差异均无显著性。对于去势大鼠 ,低应力侧下颌骨骨量显著低于高应力侧 (P <0 .0 1) ,在 3个月时 ,低应力侧骨量显著低于OVX同期对照组 (P <0 .0 5 ) ,而高应力侧下颌骨骨量显著高于OVX同期对照组 (P <0 0 5 ) ...

目的 观察双侧卵巢切除 (去势 ) (ovariectomy ,OVX)大鼠下颌骨应力环境改变与下颌骨骨量的关系。方法 拔除大鼠右侧上颌全部磨牙 ,使咀嚼侧 (左 )、非咀嚼侧 (右 )下颌骨分别处于相对的高低应力环境中 ;利用去势手术 (OVX)模仿绝经后骨质疏松症 (postmenopausalosteoporosis)。依此将48只雌性大鼠分为 4组 :①OVX +拔牙组 ,②OVX +非拔牙组 ,③Sham OVX(假去势 ) +拔牙组 ,③Sham OVX +非拔牙组。在实验 1.5个月和 3个月时应用单光子骨密度仪对各组大鼠下颌骨双侧进行骨密度测量。结果 去势大鼠下颌骨骨量显著低于正常对照组大鼠 (P <0 .0 5 )。对于正常大鼠 ,在拔牙 3个月时 ,低应力侧下颌骨骨量显著低于高应力侧 (P <0 .0 5 ) ,但它们与非拔牙对照组的差异均无显著性。对于去势大鼠 ,低应力侧下颌骨骨量显著低于高应力侧 (P <0 .0 1) ,在 3个月时 ,低应力侧骨量显著低于OVX同期对照组 (P <0 .0 5 ) ,而高应力侧下颌骨骨量显著高于OVX同期对照组 (P <0 0 5 ) ,但与Sham OVX同期对照组比 ,仍显著偏低 (P <0 .0 5 )。结论 咀嚼功能可减缓雌激素低下所引起的下颌骨快速骨丢失 ,对于保持下颌骨骨量有一定的作用 ;而咀嚼功能低下或缺失则加重其骨丢失进程。因此 ,对于有骨质疏松症的患者 ,应尽早恢复?

Objective To observe the relationship between the stress environment of mandibles and their trabecular bone structures in adult and aged male rats.Methods 24 male rats of 6 months old were used in the adult group,and 24 male rats of 15months old were used in the senile group.The high and low stress environment models of mandibles were established by unilateral maxillary molars extraction.The masticatory sides of the mandibles were regarded as the high stress sides and the non-masticatory sides were regarded...

Objective To observe the relationship between the stress environment of mandibles and their trabecular bone structures in adult and aged male rats.Methods 24 male rats of 6 months old were used in the adult group,and 24 male rats of 15months old were used in the senile group.The high and low stress environment models of mandibles were established by unilateral maxillary molars extraction.The masticatory sides of the mandibles were regarded as the high stress sides and the non-masticatory sides were regarded as the low stress sides.The rats without teeth extraction were used as the control.According to these,48 rats were divided into 4 groups:①adult+extraction group;②adult+non-extraction group;③senile+extraction group;④senile+Nnn-extraction group.The trabecular bone of mandibles were measured by bone histomorphometry bilaterally 1.5 months and 3 months after extraction respectively.Results The mandibles of senile rats had lower cancellous bone area(Cn.Ar%)and trabecular width(Tb.Wi)than those of adult rats(P< 0.05 ).There was no significant difference in trabecular separation(Tb.Sp)and trabecular number(Tb.N)in mandibles between the senile and adult rats.To adult rats,the low stress sides,the high stress sides of mandibles and the non-extraction control mandibles (P> 0.05 between each two)had similar values of Cn.Ar%,Tb.Wi,Tb,N,and Tb.Sp.To senile rats,after 3 months of teeth extraction,Cn,Ar%,Tb.Wi,and Tb.N of the low stress sides of mandibles were significantly lower than those of the high stress sides and the non-extraction control mandibles.Their Tb.Sp were significantly larger than those of the high stress sides and the non-extraction control mandibles.But Cn.Ar%,Tb.Wi,Tb.N and Tb.Sp of the high stress sides were similar to those of the non-extraction control mandibles(P> 0.05 ).Conclusion The results indicate that the masticatory deficiency(the low stress envionment)tends to aggravate the resorption and edterioration of the trabecular structures of jaws induced by aging.In order to inhibit the bone loss of the jaws,the masticatory functions should be rehabilitated for these aged patients as early as possible.

目的 观察成年和老年大鼠下颌骨应力环境改变与下颌骨骨小梁结构的关系。方法 以 6月龄及15月龄雄性大鼠分别代表成年组和老年组大鼠 ,拔除大鼠右侧上颌全部磨牙使咀嚼 (左 )侧、非咀嚼 (右 )侧下颌骨分别处于相对的高低应力环境中 ;依此将老年和成年大鼠各 2 4只分为四组 ;①老年 +拔牙组 ;②老年 +非拔牙组 ;③成年 +拔牙组④成年 +非拔牙组 ;在实验 1.5个月和 3个月时对各组双侧下颌骨的组织切片进行骨组织形态计量学分析。结果 老年组大鼠下颌骨松质骨面积比 (Cn .Ar%)、骨小梁宽度 (Tb .Wi)较成年大鼠显著降低 ,骨小梁间隔宽度 (Tb .Sp)有部分增宽 ,但骨小梁数目 (Tb .N)无显著变化 ;对于成年大鼠 ,低应力和高应力侧以及非拔牙对照组相互间下颌骨Cn .Ar %、Tb .Wi、Tb .N和Tb .Sp均无显著差异 (P >0 .0 5 ) ;而对于老年组 ,实验 3个月时 ,低应力侧Cn .Ar%、Tb .Wi和Tb .N均比高应力侧及同期非拔牙对照组显著偏低 ,Tb .Sp则显著增宽 ;而高应力侧与同期对照组相比 ,两组间各值均无显著性差异。结论...

目的 观察成年和老年大鼠下颌骨应力环境改变与下颌骨骨小梁结构的关系。方法 以 6月龄及15月龄雄性大鼠分别代表成年组和老年组大鼠 ,拔除大鼠右侧上颌全部磨牙使咀嚼 (左 )侧、非咀嚼 (右 )侧下颌骨分别处于相对的高低应力环境中 ;依此将老年和成年大鼠各 2 4只分为四组 ;①老年 +拔牙组 ;②老年 +非拔牙组 ;③成年 +拔牙组④成年 +非拔牙组 ;在实验 1.5个月和 3个月时对各组双侧下颌骨的组织切片进行骨组织形态计量学分析。结果 老年组大鼠下颌骨松质骨面积比 (Cn .Ar%)、骨小梁宽度 (Tb .Wi)较成年大鼠显著降低 ,骨小梁间隔宽度 (Tb .Sp)有部分增宽 ,但骨小梁数目 (Tb .N)无显著变化 ;对于成年大鼠 ,低应力和高应力侧以及非拔牙对照组相互间下颌骨Cn .Ar %、Tb .Wi、Tb .N和Tb .Sp均无显著差异 (P >0 .0 5 ) ;而对于老年组 ,实验 3个月时 ,低应力侧Cn .Ar%、Tb .Wi和Tb .N均比高应力侧及同期非拔牙对照组显著偏低 ,Tb .Sp则显著增宽 ;而高应力侧与同期对照组相比 ,两组间各值均无显著性差异。结论 咀嚼功能低下或缺失 (低应力环境 )可加速老年因素引起的下颌骨骨小梁吸收 ,对于老年患者应尽早恢复其咀嚼功能 ,减少颌骨骨丢失。

Objective: To investigate whether the edentulousness can induce degenerative changes in rats'TMJ. Methods: 54 female SD rats, aged 70 days, were divided equally and randomly into three groups. Group A: all molars were extracted and all incisors were sheared. Group B: only upper jaw molars were extracted and upper jaw incisors were sheared. Group C:no tooth was extracted or sheared as control. All animals were raised in the same way. At the time of 4, 12 and 24 weeks after operation, six rats of each group were...

Objective: To investigate whether the edentulousness can induce degenerative changes in rats'TMJ. Methods: 54 female SD rats, aged 70 days, were divided equally and randomly into three groups. Group A: all molars were extracted and all incisors were sheared. Group B: only upper jaw molars were extracted and upper jaw incisors were sheared. Group C:no tooth was extracted or sheared as control. All animals were raised in the same way. At the time of 4, 12 and 24 weeks after operation, six rats of each group were killed by deeply anaesthetizing. One side condyles of TMJs were sectioned and stained with HE, the other side condyles of TMJs were observed by scanning electron microscope. Results: The cartilage of TMJs in group A and B were found with significant degenerative changes and these changes increased with time prolonged after operation,which included the cartilage thickness of anterior and intermediate part of condyle decreased, the disturbance of continuation of intermediate hypertrophic layer appeared and part of them locally replaced by fibrous tissue. The micrographs of the condylar surface was inordinate,the gelation material of condylar surface in group A and B was lost,and the collagen tissue of deep layer exposed. Conclusion: The edentulousness may lead to degenerative changes in rats'TMJ.

目的:探讨无牙颌大白鼠髁突软骨是否存在退行性变化。方法:!54只鼠龄70d的雌性SD大白鼠,随机分为拔除全口磨牙和剪断全部切牙组(A组)、拔上颌磨牙和剪断上颌切牙组(B组)、不拔牙对照组(C组)。三组动物在相同条件下分笼喂养,分别于实验后4、12、24周时取材,各时间点每组取材6只实验动物,对一侧髁突作组织学观察和测量,另一侧作扫描电镜观察。结果:!与对照组相比,A、B两组髁突软骨有随时间延长而逐渐加重的退行性变,表现为增殖层和肥大层前、中两点软骨均变薄(P<0.05),关节中部软骨缺损,局部组织纤维化。同时,髁突表面凝胶状物质消失,深层胶原纤维暴露,全口无牙颌组比半口无牙颌组更明显。结论:!无牙颌可导致大白鼠髁突软骨发生退行性变。

 
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