主题：流行病学 | 医源世界 关键词】 龋齿；牙龈出血；牙石；流行病学研究；儿童 [gap=1179]Key words】Dental caries; Gingival hemorrhage; Dental calculus; Epidemiologic studies; Child
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图片来自网络什么是牙结石？牙结石专业称牙石（dental calculus），是沉积在牙面或修复体上的已钙化的或正在钙化的菌斑及沉积物，由唾液或龈沟液中的矿物盐逐渐沉积而成。
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Dental Calculus or Tartar 牙结石又叫牙石
dental calculus and soft deposits 牙石和软垢 ; 释义牙石和软垢
dental calculus deposition 牙石沉积
subgingival dental calculus 龈下牙石
supragingival dental calculus 龈上牙石
People with periodontal disease often have dental calculus, which is also a kind of pathologic calcification in oral cavity.
牙周病患者的口腔环境中也存在病理性钙化—牙结石。
参考来源 - 牙周病患者牙结石和龈沟液中纳米细菌的初步研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Objective: To observe the crystal character of the attached end and free end of dental calculus.
目的：观察牙结石附着面和游离面晶体构型的差异。
The detection rates of gingival bleeding, dental calculus, periodontal pocket and periodontal attachment loss were 93.
牙龈出血、牙石、牙周袋、牙周附着丧失的检出率分别为93。
Results 15-year-old group is significantly higher than 12-year-old group in gingival bleeding detection frequency; dental calculus detection frequency and average section count.
结果：两个年龄组的牙龈出血检出率、牙石检出率以及牙石平均区段数，15岁年龄组明显高于12岁年龄组。
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