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第二双尖牙
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  second premolar
     Methods 24 Class I maxillary and mandibular second premolar extraction cases and 25 class I non-extraction cases were obtained, and all of them have a larger mandibular plane angle(large than mean value) and normal overbite or open bite tendency.
     方法 24 例覆正常或较浅且下颌平面角大于均值的安氏 I类错患者(骨性与牙性均为 I类)拔除第二双尖牙,应用直丝弓技术完成矫治,25 例符合同样标准的患者由不拔牙矫正完成。
短句来源
     They were divided into 21 extraction cases (including 13 four first premolar extraction cases and 8 second premolar extraction cases) and 12 nonextraction cases by checking patients’ treatment records.
     33例中有 1 2例采用了不拔牙治疗 ,1 3例采用了拔 4个第一双尖牙治疗 ,8例采用了拔 4个第二双尖牙治疗。
短句来源
     (2) 60. 7% of the patients who has transverse dental arch disharmony were bilateral posterior crossbite (3) The inter-cuspid, first premolar and second premolar arch width in the upper arch were increased significantly after treatment, whereas the inter-molar width was changed insignificantly.
     (2)在出现牙弓间横向关系不调的患者中,双侧后牙反(牙合)者为60%。 (3)正畸治疗后上颌牙弓的尖牙、第一、第二双尖牙间各自的宽度均有显著增加,第一磨牙间宽度变化不显著。
短句来源
     Objective The purpose of this study was to assess the vertical changes occurring in Class I patients treated orthodontically with second premolar extraction and to compare these changes with those occurring in Class I patients treated orthodontically without extractions.
     目的 评价安氏 I类错畸形患者,特别是下颌平面角较大的患者拔除第二双尖牙矫正后颌面的垂直向变化,尤其是下颌平面的旋转变化。
短句来源
     (4) After treatment the changes of dental arch width in first and second premolar region were larger than that of cuspid and first molar regions.
     上颌第一、第二双尖牙间各自宽度较尖牙间、第一磨牙间宽度增加显著。
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  second bicuspid
     Then, it is gradually decreased from first bicuspid to second bicuspid, first molar, which are 2.09mm, 1.74mm and 1.07mm, respectively.
     第一双尖牙、第二双尖牙、第一磨牙的牙尖高度值依次递减,分别为2.09mm、1.74mm、1.07mm。
短句来源
     Then, it is gradually decreased from first bicuspid to second bicuspid, first molar, which are 3.96mm, 3.62mm and 2.95mm, respectively.
     第一双尖牙、第二双尖牙、第一磨牙的托槽粘贴高度值依次递减,分别为3.96mm、3.62mm、2.95mm。
短句来源
     4.53mm. Then it is gradually decreased from the central incisor to first bicuspid, lateral incisor, second bicuspid, first molar, which are 4.39mm, 4.10mm, 3.81mm, 3.72mm and 3.07mm, respectively.
     中切牙、第一双尖牙、侧切牙、第二双尖牙、第一磨牙的托槽粘贴高度值依次递减,分别为4.39mm、4.10mm、3.81mm、3.72mm、3.07mm。
短句来源
     Results: 1. the height of the cuspmaxillary: the height of canine cusp is biggest, which is 2.76mm, and it is gradually decreased from the central incisor to first bicuspid, lateral incisor, second bicuspid, first molar, which are 2.62mm, 2.32mm, 2.04mm, 1.85mm and 1.29mm, respectively.
     结果: 1.牙尖高度值⑴上颌:尖牙的牙尖高度值最大,为2.76mm; 中切牙、第一双尖牙、侧切牙、第二双尖牙、第一磨牙的牙尖高度值依次递减,分别为2.62mm、2.32mm、2.04mm、1.85mm、1.29mm。
短句来源
     Conclusion With respect to the protection of the anchorag e of molar,it is more suitable for the palatal implant to connect with the first permanent molar than with the maxillary second bicuspid.
     结论 就保护磨牙支抗来说,种植体连接在上颌第一恒磨牙较之连接在上颌第二双尖牙更加合适。
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  “第二双尖牙”译为未确定词的双语例句
     The SNB angle of the four first premolars extraction group was smaller than that of the four second premolars extraction group by (4.0±1.3)°( P <0.01).
     拔第一双尖牙组的前颅底平面 -下牙槽座点角 (SNB角 )比拔第二双尖牙组的SNB角小 (4 .0±1 .3)°(P <0 .0 1 ) ;
短句来源
     Results The rates of canines movement towards the second premolars were 0. 80 - 1. 05mm/month, and the average rate was 0. 90 mm/month. There were significant differences in the rates of canines movement inducted by Ni-Ti round wires of various diameters(P<0. 01).
     结果 尖牙与第二双尖牙靠拢的速度为0.80-1.05mm/月,平均速度0.90mm/月,且不同直径Ni-Ti圆丝引导下速度之间具有显著性差异(P<0.01)。
短句来源
     Results After treatment the arch perimeter was increased by 3.22mm and the index of incisor discrepancy was decreased by 1.66mm,which was contributed to incisor proclination,molar uprighting or distalization and passive increase in mandibular arch widths.
     结果治疗后牙弓周长平均增加3.22mm,牙弓长度增加1.37mm,尖牙间宽度、第二双尖牙间宽度与第一磨牙间宽度分别增加1.63mm,2.35mm和1.83mm,切牙不齐指数减小1.66mm。
短句来源
     Cheek teeth, especially molars contributed mainly to the occlusal contact area.
     牙合接触面积主要分布于后牙区 ,尤其是磨牙区 ,牙合接触面积的大小依次为第一磨牙、第二磨牙、第二双尖牙、第一双尖牙、中切牙、尖牙和侧切牙 ;
短句来源
     Results After the maxillary molars were pushed distally (average 3.9 mm), the upper second bicuspids drifted backward without extra force (average 1.63 mm).
     结果 推上颌第一恒磨牙平均后移 3.9mm时上颌第二双尖牙在没有外力作用下随之向后漂移平均 1.6 3mm。
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  second premolar
One pattern consisted in agenesis of a second premolar, often in combination with agenesis of neighbor teeth, including the fourth premolar.
      
Compared with the healthy test subjects, patients who had received surgical treatment showed significantly higher signal intensity increases at two measurement sites, i.e., the second molar and the second premolar (P>amp;lt;0.05).
      
Following the pilot study, subjects' age was modeled as a function of gender (g), morphological variables (predictors)?×?5(second premolar), s (sum of normalized open apices) N0, and the first-order interaction between s and N0.
      
The second premolar and second molar were used as abutments.
      
The highest recorded approximal space temperature was 52.8°C in the lower jaw, between the first and the second premolar.
      
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  second bicuspid
Since the second bicuspid area was a potential implant site, options were considered for improving the existing bone morphology.
      
The 71-year-old female patient sustained a fracture of the maxillary right second bicuspid.
      


The writers collected 400 intact mandibulae from Hubei region (300, male; 100, female) and took careful observation and measurement of them, The results are as follows: 1. The place of the foramen mentale: It is situated a little above the midway between the upper and lower borders of the mendibular body and slightly behind the point at which the front 1/4 connects with the middle-front 1/4 of one side of the bone. The majority of the foramina are below tile second premolar or below the interval between the...

The writers collected 400 intact mandibulae from Hubei region (300, male; 100, female) and took careful observation and measurement of them, The results are as follows: 1. The place of the foramen mentale: It is situated a little above the midway between the upper and lower borders of the mendibular body and slightly behind the point at which the front 1/4 connects with the middle-front 1/4 of one side of the bone. The majority of the foramina are below tile second premolar or below the interval between the second premolar and the first molar. 2. The form of the foramen mentales can be classified into three types: oval, circular and irregular. The oval form, accounting for 64.66% of male and 76% of female, is the commonest of the three, the circular one takes second place, and the irregular is few. 3. The width and length of the foramen mentales: The width (the average value) ranges: male, 3.15mm, and female, 2.83 mm. The length ranges: male, 2.74mm, and female, 2.48 mm. 4. The opening direction the foramen mentales can also be divided into three types. The back-upward accounting for 85.3% of male and 83.0% of female is the commonest one. The backward comes second. And the directly upward is few. In the application of the foramen mentale to clinical block anes thesia, the most proper site is a little above the midway between the upper and lower borders of the mandibular body, i.e, at a point which is 28~29 mm far from the median line and points directly to the second premolar.

本文观测了湖北地区收集的400个(男:300,女:100)下颌骨800侧颏孔的位置、大小、形状和开口方向。其上、下位置在下颌骨体上、下缘间中点的稍上方,前后位置在下颌联合至下颌支后缘连线的前1/4与中前1/4相交处稍后方,多数颏孔正对第二双尖牙。其横径大于纵径,多数呈卵圆形。其开口方向大多数朝向后上方,次为后方,少数朝向上方。提出了临床应用颏孔阻滞麻醉时,应在颏孔的上、下缘中点稍上方,距中线28~29mm,正对第二双尖牙为最适当的位置。

Recently, the finite element method hasbeen adopted in the study of tooth structureas wull as the stress distribution of dentalprosthesis.In order to understand the load-ing state of the supporting tissues and thestress distrbution of the teeth in variousshapes under the pressure of loading, theauthor of this essay has applied the two-dimensional finite element method to thestudy of the stress distribution of the peri-odontal supporting tissues at the time whenthe second bicuspid and the second molarare vertically...

Recently, the finite element method hasbeen adopted in the study of tooth structureas wull as the stress distribution of dentalprosthesis.In order to understand the load-ing state of the supporting tissues and thestress distrbution of the teeth in variousshapes under the pressure of loading, theauthor of this essay has applied the two-dimensional finite element method to thestudy of the stress distribution of the peri-odontal supporting tissues at the time whenthe second bicuspid and the second molarare vertically and obliquely loaded. Finally,the results of the quantitative analysis areobtained and a curve of the stress distribu-tion of the teeth is also drawn up. The conclusion is as follows: 1.When the vertical loading is appliedto the occlusal surface of the bicuspid andmolar, the stress distribution of periodontalsupporting tissues is uniform. 2.The stress concentration is on themarginal ridge and thedistal apex of bicuspidunder the oblique loading. 3.When the oblique loading is applied tothe occlusal surface of the molar, the stressconcentration is only on the marginal ridge.and it is small.

作者采用平面有限单元法,对下颌第二双尖牙、第二磨牙垂直向和斜向受载时牙周支持组织的应力分布进行了研究,得到了定量分析的结果,并绘出了应力分布的曲线图。发现:双尖牙(牙合)面斜向受载时出现颈部近中受拉应力,颈部远中受压应力,以及根尖远端应力较集中。磨牙(牙合)面承受斜向近中载荷时,颈部近中受压应力,远中受拉应力;受斜向远中载荷时,颈部近中受拉应力,远中受压应力。双尖牙及磨牙(牙合)面受垂直向载荷时,则牙周支持组织应力分布较均匀,这种力对牙周组织的健康是有利的。

The fixed bridge is a common prosthesiswidely used in clinical dentistry. In order todesign an ideal fixed bridge which canprovide the best protection of the abut-ments, we must study the stress distribu-tion of alveolar bone, when the fixed bridgeis under the loading. In this article, we report the applica-tion of the finite element method to exa-mine the stress distribution of the alveolarbone of fixed bridge abutments. We havemade seven vertical loading models and twooblique loading models. A quantitativeanalysis...

The fixed bridge is a common prosthesiswidely used in clinical dentistry. In order todesign an ideal fixed bridge which canprovide the best protection of the abut-ments, we must study the stress distribu-tion of alveolar bone, when the fixed bridgeis under the loading. In this article, we report the applica-tion of the finite element method to exa-mine the stress distribution of the alveolarbone of fixed bridge abutments. We havemade seven vertical loading models and twooblique loading models. A quantitativeanalysis result has been obtained and thestress distribution result drawn up by acomputer. The results of this analysis are asfollows: 1. Under the seven vertical loadings, thebearing compress stress on the mesial apexof the second bicuspid is large.In this areathe compress stress is largest, when thevertical loading is applied on the two-abutment tooth and pontic, the σ_2 is-120.0 but the stress of alveolar bone of themolar iS uniform. 2.Under the oblique loading, by themesial apex of bicuspid are borne the ten-sile stress and compress stress, the latter islarger than the former, and theσ_2 is-75.0. 3.The molar is an ideal abutment toothfor the fixed bridge.

作者用平面有限单元法,对下颌第一磨牙缺失的固定桥进行七种垂直向和两种斜向受载的基牙牙槽骨的应力分布进行了研究,得出定量分析的结果,并绘出牙周组织应力值的曲线图。作者认为:①从固定桥的七种垂直受载情况看,均为第二双尖牙根尖的近中部受到较大的压应力。以两个基牙和桥体同时受载时,应力为最大,σ_2为-120.0,而磨牙牙周组织应力分布较均匀。②固定桥桥体受斜向载荷时,双尖牙根尖的近中部受拉应力和压应力,以压应力为最大,σ_2为-75.0。③磨牙是固定桥的理想基牙。

 
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