论文部分内容阅读
牙齿变色混浊、釉质缺损常致牙列不齐、位置不正、影响美观。这种改变是牙齿在生长发育期间受到某种全身的或局部的不和j因素,使牙体硬组织逐渐形成一定的缺陷;近廿年来由于空气氟和水氟浓度影响形成氟斑症;四环素族在临床上广泛应用引起牙齿变黄、严重的牙釉质发育不全。这些方面形成牙冠形态异常和牙冠着色,易患龋病,影响美观,其发病率甚高,估计20岁前后的青少年3个人中至少有1个人牙齿不美属这种改变,因而成为临床上的新问题。
Tooth discoloration, often caused by missing enamel missing dentures, the location is not correct, affecting the appearance. This change is the teeth during growth and development by some kind of systemic or local and j factors, the gradual formation of tooth hard tissue defects; nearly 20 years due to the impact of air fluoride and water fluoride formation of fluoride plaque; tetracycline Family widely used in clinical causes yellow teeth, severe enamel hypoplasia. These aspects of the formation of abnormal crown shape and tooth crown, susceptible to dental caries, affecting the appearance of a very high incidence of pre-and post-20-year-old adolescents estimated that at least one of the three teeth are not American, so the change has become clinically On the new issue.