查询词典 premolar teeth

The clinical characters of oligodontia concluded from this study are following:(1) There is significant difference that more teeth absent and more existent teeth anomalies in patients of oligodontia/S group than in patients of oligodontia/I group, and the peg-shaped upper lateral incisor is the most frequently affected teeth with shape anomaly.(2) Both of the two groups have no significant differences in number of teeth missing between maxilla and mandible as well as that between left and right side.(3) The distribution of teeth missing is bilateral symmetry in both groups, but the frequency of teeth lost are different: excluding the third molar, in oligodontia/I group, the lower second premolar is the most frequently congenitally missing tooth followed by the upper lateral incisor, while in oligodontia/S group, the most frequently missing teeth are mandibular canine and maxillary lateral incisor. Nevertheless, the first molars are the most stable teeth in both groups.(4) In oligodonita/I group, the mean mesiodistal dimensions of all type of existent teeth are significantly smaller than normal value. It is implied that oligodontia is not an isolated phenomenon, but is related to a complex of other dental changes.

对于口腔多个恒牙先天缺失的临床特点有以下初步结论：(1)综合征型先天缺牙患者较单纯型先天缺牙患者恒牙缺失数目更多，平均分别为23.9个和14.9个，且现存牙齿有更多的形态异常，分别为7／10例（70％）和6／22例（27.3％），其中最常见的是上颌侧切牙畸形；(2)两种类型的多个恒牙先天缺失患者的缺牙数目在上下颌及左右侧之间均无差别；(3)两种类型的多个恒牙先天缺失患者在缺失牙位上均呈对称分布，但在具体牙位上有所差异：不计第三磨牙，单纯型先天缺牙最常缺失的牙位是下颌第二双尖牙、其次为上颌侧切牙；而综合征型先天缺牙最常缺失的牙位是下颌尖牙和上颌侧切牙；无论何种情况，第一磨牙均为牙列中最稳定的牙齿；(4)在单纯型先天缺牙患者中，现存恒牙的牙冠宽度较国人正常值偏小，差异显著，提示牙齿形态与多个牙先天缺失有一定相关性。

LiWei INC was founded in 1999, integrating scientific research, design, production, operating in one, professional production and sale of Rock Drilling, mining accessories, engineering tools, rock drilling tools, milling machine milling teeth, milling Machine Cutter, road Mixer Cutter, coal mine cut teeth with various types of Shearer with conical teeth, knife-shaped cross-sectional tooth, boring machine with boring tooth, shield knives, metro shield machine shield configuration tools and various types of mining bits, rock drills, anchor drills, rotary drilling engineering cut-off teeth, using rotary drilling rig Rotary Drilling teeth, tooth roadheader, Rotary Drilling teeth, bucket teeth, tooth Block, and a variety of Rock Drilling Bits, including word, cross drill head, the ball tooth drill head, drill sets, drill tail, drill rod and so on.

香港立威刀具有限公司始建于1999年，集科研、设计、生产、经营于一体，专业生产和销售凿岩钎具、矿山配件、工程工具、岩土钻掘工具、铣刨机用铣刨齿、铣刨机刀头、路拌机刀头、煤矿用截齿、各种型号的采煤机用镐形截齿、刀形截齿、掘进机用掘进齿、盾构刀具、地铁盾构机用盾构刀具及各种型号的矿用钻头、岩石钻头、锚杆钻头、工程用旋挖截齿、旋挖钻机用旋挖齿、掘进机截齿、旋挖齿、斗齿、齿座和各种凿岩钎具包括一字钎头、十字钎头、球齿钎头、钎套、钎尾、钎杆等。

Results The incidence of wedge-shaped defects reached 97.3 %,and the frequency of involved teeth was:first premolar,second premolar,first molar,cuspid.

结果 该组老年人楔状缺损的发病率为97 。3 %，且随年龄递增；楔状缺损的好发部位和缺损程度第一双尖牙列首位，其次为第二双尖牙，第一磨牙；其中第一磨牙比以往人们认为的尖牙更好发楔状缺损。

Nano-imprint lithography drum paper teeth axis, swayig begnawing workparts paper teeth or wear, allows unleashmy begnawing paper teeth in paper in an inconsistent state in that result in bilateral irregular longitudinal misregister, in which case on slow computers are more likely to occur, because the impact of low-speed machine tipping bucket, the strength of a rotational motion paper teeth ranges of swayig high speed machine is used, and indirect sheet transfer unleashmy simpleplan paper teeth have smaller, at the same time as a result of automatic circulation lubrication oil system, unleashmy and apparatdus paper teeth axis is not easy to wear, but bearing in mind that oil, oilway jam torn oil grinding.

压印滚筒咬纸牙轴，摆动咬纸牙轴或轴套磨损后，不离使得咬纸牙在咬纸功程洋处于不稳不退状况，以至于爆发双边无次序的纵向套印禁绝，这栽环境在不低速机上比辛便当呈现，因为不低速机翻斗撞击辛不小，咬纸牙轴动弹幅度比辛不小，不低速机是拔取摆动不直接递纸，并且咬纸牙闭合幅度也较小，同时又由于有被迫轮回油路编制润滑，所以咬纸牙轴及轴套不便当磨损，但给夺目油眼，油路畅通导致不续油咬不松。

The measurement covered the tooth material,premolar diametre,premolar basal arch widthand basal arch length. The ratios of PMD/TM, PMBAW/TM and BAL/TM were calculate.

测量牙量、双尖牙弓宽径、双尖牙根尖基骨宽径、基骨弓长度，并计算PMD/TM、PMBAW/TM、BAL/TM值，对其进行统计学处理与分析。

Methods: 50 maxillary first premolar and 60 maxillary second premolar were included in the study.

挑选拔除的50颗上颌第一前磨牙及60颗上颌第二前磨牙。

Absence of one incisor or one canine, a third premolar or a fourth premolar or of one molar.

缺一个门齿或犬齿，第三前臼齿或第四前臼齿或一个臼齿。

This in vivo study was to examine the historical changes of implanted novel chitosan/collagen composite barrier for confirming the clinical feasibility. Four other commercial GTR membranes were chosen for comparison. Among the resorbable GTR membranes, BioMend Extend and Peri-Aid are collagen base, and GORE-TEX OSSEOQUEST is synthesized membrane, while GORE-TEX e-PTFE (Expanded polytetrafluoroethylene) is synthesized but non-resorbable. Beagle dogs were used as animal model. Buccal mucoperiosteal flaps were reflected in the bilateral mandibular premolar and molar areas. Buccal alveolar bone was reduced on 1st、2nd premolar and molar to a level 5 mm apical to the cemento-enemel junction. Root surface was denuded of periodontal ligament and cementum, and notches were placed at the bone level of each root. The tested GTR barriers were implanted in critical bone defect areas. Flaps were coronally positioned and sutured. Two beagle dogs were sacrificed each time as the designed time period after surgery. Histological and histometirc evaluation at 7 days、14 days、28 days、3 months were performed post-operatively to determine the healing response of each treatment modality.

本研究之目的在评估与工研院生医中心合作发展出可吸收性去乙醯几丁聚醣/胶原蛋白复合之组织导引再生膜片，并选择与可吸收性之BioMend Extend 及Peri-Aid 胶原蛋白膜片，和GORE-TEX OSSEOQUEST 合成高分子膜片，及不可吸收之GORE-TEX e-PTFE合成高分子膜片，等其他四种市售商品材料共同对照评估，应用8只年龄为12个月的雄性小猎犬，均分4组(分别为7天、14天、28天、3个月)，为动物活体评估模式，在实验犬之左、右下颚第一、二小臼齿及大臼齿的颊侧区制造骨缺损后，分别植入组织导引再生膜片，依实验设定时间将小猎犬牺牲，取下缺损区骨头，以光学显微镜观察量测其牙垩质再生高度与齿槽骨再生高度之变化，以探讨其组织再生模式及评估新膜片在临床应用之适用性。

Anchorage loss measured at the first premolar averaged 1.3 mm,but the crowns tipped 3.5?distally.During distalization with Distal jet,the first premolar did not tend to tip mesially as found in many investigation of other intraoral distalizing appliance.

每侧第一前磨牙的支抗丧失平均为1.3mm并伴3.5 的牙冠远中倾斜，这一结果不同于其它口内磨牙远移装置所造成的前磨牙牙冠近中倾斜，与国外对同类矫治器的观察结果相似。

Birth, the permanent teeth in the deciduous tooth germ had been under, with the exception of the first molar (ie, age 6 teeth) in the neonatal period has begun to calcification, the calcification of permanent teeth is carried out in infancy, Therefore, the infant not only to protect the deciduous teeth, but also in order to obtain a fit and lay the foundation for permanent teeth.

婴儿出生时，恒牙的牙胚就已在乳牙之下，除第一磨牙（即6龄牙）在新生儿时期已开始钙化外，一部分恒牙的钙化是在婴儿期进行的，因此，婴儿期不仅要保护好乳牙，还要为获得一副健美的恒牙奠定基础。

Pradeep Indulkar, a senior official at the Maharashtra state Home Ministry say 101 human were killed and 287 injured.

马哈拉施特拉邦内政部高级官员Pradeep Indulkar称，有101人在冲突中丧生，287人受伤。

Mark Frei, a senior vice president of West, says 80% of West's homeagents have some college education, compared with 30% of those whowork in office-based call centers.

Frei说，该公司80%在家办公的人员都拥有本科学位，而在公司电话中心工作的人中只有30%拥有本科学位。