Добавил:
Upload Опубликованный материал нарушает ваши авторские права? Сообщите нам.
Вуз: Предмет: Файл:
Черед.учеб. пособ. стом..doc
Скачиваний:
1
Добавлен:
01.07.2025
Размер:
583.17 Кб
Скачать

IX. Translate the following word combinations:

laboratory studies, tooth anatomy, contact areas, tooth movement, blood supply, pulp chamber, root surfaces, cementoenamel junction

X. Match the words with the close meaning:

1. chamber

2. susceptible

3. occasionally

4. decrease

5. groove

6. from time to time

7. cavity

8. the elderly

9. sensitive

10. the aged

11. reduction

12. notching

XI. Read and translate the text.

Changes in the Teeth and Supporting Tissues

Many of the changes in the hard dental tissue associated with senescence have their analogy in the deciduous teeth which erupt, lose their morphological characteristics through normal wear of abrasion and eventually are exfoliated. In later life the permanent teeth become drier, more brittle and darker. These clinically observed changes have been verified by laboratory studies. The apparent decrease in the prevalence of dental caries in the elderly patients is largely the result of a reduction in the number of susceptible areas for caries because of previous dental restoration and the loss of health.

Dental restorations that do not take into consideration modifications of tooth anatomy occurring with age may place abnormal and destructive stresses on the teeth and the supporting tissues. The contact areas of the teeth become flattened as a result of the slight physiological tooth movement during chewing. Degenerative changes in the dental periostenum resulting from pressure and the decreased blood supply may take place.

Years of improper tooth-brushing may be manifested in the aged by the presence of V-shaped horizontal grooves in the teeth apical to the cementoenamel junction. This abrasion grooving may extend into the dentin to include areas formerly occupied by the dental pulp. Pulpal exposure occurs occasionally but in most instances sufficient secondary dentin is produced to prevent exposure of the pulp, or at times to obliterate the pulp chamber. These grooved teeth are unsightly and at times they fracture at the site of the notching.

Gingival atrophy in conjunction with the continuous eruption of the teeth results in exposure of the root to the oral environment. These exposed surfaces frequently give rise to painful stimuli when thermal changes take place within the oral cavity.

XII. Answer the following questions.

1. Are many changes observed in the hard dental tissues with senescence?

2. Why is dental caries decreased in the elderly patients?

3. What changes are observed in the permanent teeth?

4. May dental restorations place abnormal and destructive stresses on the teeth and the supporting tissues with age?

5. As a result of what do the contact areas of the teeth become flattened?

XIII. Complete the sentences according to the text.

1. Many of the changes in the hard dental tissues are associated …

2. The deciduous teeth …

3. The permanent teeth become …

4. These clinically observed changes have been verified by …

5. The contact areas of the teeth …

6. Degenerative changes in the dental periosteum …

7. Years of improper tooth brushing may be manifested …

8. In most instances sufficient secondary dentin is produced to prevent …

9. These grooved teeth are …

10. At times they fracture at the site of …

11. These exposed root surfaces give rise to …