premolars 中文意思是什麼

premolars 解釋
前齒
  1. The teeth located between the cuspids and the molars, having either two or three cusps. the bicuspids are numbered 4, 5, 12, 13, 20, 21, 28 & 29. also known as premolars

    位於尖牙和磨牙（臼齒）之間的牙，所有雙尖牙都有兩個或三個牙尖.雙尖牙被編號為4 ， 5 ， 12 ， 13 ， 20 ， 21 ， 28和29 .也被稱為前磨牙（臼齒）
  2. Tooth crowding occurs if there is inadequate room for all permanent teeth to erupt or when the permanent premolars erupt and the growth of the jawbone stablizes

    牙齒排列不整齊由於恆齒的體積比乳齒大，恆齒長出時可能不夠空位，引致牙齒排列參差不齊。
  3. Results : clinical crown height of upper premolars lower premolars and lower molars are increased

    對照組12例，為條件相當而未作治療的兒童。
  4. Width between left and right premolars in upper and lower arch are increased while decreased between lower molars

    在咬合打開后，進行咬合打開前、后的模型測量研究。
  5. Deviations are level bites, extra premolars, missing incisors, premolars and / or back molars, and poor occlusion

    水平咬合，多出的臼齒，缺失門齒、小臼齒及後面的臼齒，和閉合不正都屬于缺陷。
  6. They studied about 80, 000 fossils, predominately molars and premolars, to reveal when 132 different species of small rodents first arose ? and when the animals disappeared

    他們研究了大約8萬塊化石.大多是臼齒和前臼齒的，以探明132個小型嚙齒目物種何時產生又何時消亡
  7. This paper illustrated the characters about root canal morphology of mandibular premolars, including the formation, configurations, racial difference, classification and methods for study

    本文簡要介紹下頜前磨牙多種解剖結構的形成、形態特點、人種差異、分型和研究方法。
  8. Ion objective : to investigate effect of nd : yag laser irradiating root canals on periapical tissue. methods : three minipigs were used in this study, deciduous premolars were opened, pulps were extracted, root canals were enlarged, then irradiated with nd : yag laser 30s and filled conventionally. the changes of periapical tissue were observed after 1, 3, 7 and 15 days. results : after one day, periapical tissue showed enlargement and engorgement of blood vessel and a few of leukocyte, the changes were more serious than in control. after 3 and 7 days, there were minor reactions in periapical tissue and same as the control group. after 15 days, periapical membrance in most specimens was normal. slight inflammatory reaction was found in the test group as same as in control group. conclusion : there was little damage to periapical tissue with the laser irradiation

    目的:觀察激光在根管內照射后對根尖周組織的作用.方法:選3隻小型豬，全麻下將乳前磨牙開髓、抽髓，根管擴大后，激光照射30秒，做常規根管充填.對照組為常規根管充填. 1天、 3天、 7天和15天後觀察根尖周組織的變化.結果:激光照射后1天，根周膜血管充血、輕度炎癥，對照組只有根尖周膜充血.激光組組織反應比對照組稍重.激光照射后3天和7天，少數病例根周組織有輕度的刺激與對照組的病理表現相近.激光照射后15天部分標本根周膜正常，部分標本有輕度炎癥反應，與對照組結果基本相似.結論:本激光照射條件對根尖周組織沒有明顯損傷作用，可供臨床應用時參考
  9. The first group is the 6 incisors, the next group is the four premolars on the bottom and top of each side, and the final group is the three top molars and two molars on the bottom of each side

    第一組是6顆門齒，第二組是每邊的底部和頂端上的四個小臼齒，最後的一組是兩邊頂端三顆臼齒和底部的二顆臼齒。
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