000367

69 Teacher: What can you tell me about the supporting structures? Student: The part of the jaw containing the teeth is known as the alveolar process. It is covered with a gum. A tooth is attached to its socket in the jaw by a soft fbrous tissue called the periodontal membrane. Teacher: Thank you. Your answer was good. – 2 – Teacher: The deciduous teeth are also known as «baby teeth». There are twenty of them. Student: How are they named? Teacher: The fiv teeth on each side of both jaws are named as follows: central incisors, lateral incisors, canine, 1 st molar, 2 nd molar. Student: When do they start developing? Teacher: Deciduous teeth start developing before birth. Eruption starts at six months and is completed at two years. Student: And is there any difference in the frst and second set? Teacher: Yes, of course. Permanent teeth are the second set. There are thirty-two of them. After the deciduous teeth loosen, they are soon replaced by eruption of the permanent ones. Deciduous incisors and canine are replaced by permanent teeth of the same name. Deciduous molars are replaced by premolars. We must also speak about 3 rd molars. So there are eight permanent teeth on each side of both jaws. – 3 – A.: Эмаль покрывает коронку, не так ли? B.: Да. Эмаль – это самая твердая ткань человека. A.: А где расположен дентин? B.: Дентин занимает внутреннюю часть коронки и корня. Он очень чувствителен к боли. A.: А что такое цемент? B.: Цемент – это внешнее покрытие корня, по структуре он схож с костью. A.: Твердая ли ткань пульпа? B��������������������������������������������������������������� .: Нет, пульпа представляет собой мягкую ткань, содержащую кро‑ веносные сосуды и нервные окончания. A.: А что ты знаешь о поддерживающих структурах?