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Warning: strtotime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/volgostoma/domains/stom-portal.ru/public_html/plugins/content/extranews.php on line 589

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Автор: Administrator   

Warning: mktime(): It is not safe to rely on the system's timezone settings. You are *required* to use the date.timezone setting or the date_default_timezone_set() function. In case you used any of those methods and you are still getting this warning, you most likely misspelled the timezone identifier. We selected the timezone 'UTC' for now, but please set date.timezone to select your timezone. in /home/volgostoma/domains/stom-portal.ru/public_html/libraries/joomla/utilities/date.php on line 117

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17.07.2014 14:01

Отличия молочных зубов от постоянных

Временные зубы появляются у ребенка в возрасте от 6 месяцев до 2 лет, а прорезывание постоянных начинается с первого моляра в возрасте 6 лет.

1. Зубов во временном прикусе 20, в постоянном — 32.

2. В постоянном прикусе имеются резцы, клыки, премоляры, моляры, во временном — резцы, клыки, моляры, а премоляров нет.

3. Молочные зубы имеют голубовато — белый оттенок, а постоянные — желтоватый оттенок.

4. По величине коронка и корень молочного зуба всегда меньше, чем одноименного постоянного.

5. Ширина коронок молочных зубов более выражена по сравнению с их высотой.

6. Форма коронки временных зубов более выпуклая, чем постоянного, в силу чего коронка молочного зуба имеет резкое ограничение от корня.

7. В области шейки молочного зуба есть эмалевый валик — выступообразное утолщение эмали. За счет этого наибольший диаметр коронка молочного зуба имеет в области шейки, а постоянного — в области экватора.

8. Толщина твердых тканей молочного зуба меньше, чем постоянного.

9. Твердые ткани молочных зубов меньше минерализованы по сравнению с постоянными, поэтому менее тверды.

10. Полость зуба молочных зубов обширнее полости зуба постоянных зубов.

11. Корневые каналы и апикальные отверстия молочных зубов более широкие и свободно проходимые, чем постоянных, особенно в период формирования корней.

12. Корни молочных зубов менее округлые по сравнению с постоянными.

13. Корни молочных моляров широко расходятся в стороны, так как между ними располагается зачаток постоянного зуба.

14. В период смены на корнях молочных зубов видна резорбция (рассасывание).

15. Вследствие этого наблюдается подвижность молочных зубов, в то время как постоянные неподвижны.

16. В зубном ряду ребенка 5-6 лет появляются широкие межзубные промежутки, в постоянном прикусе в норме зубы плотно контактируют боковыми поверхностями, трем и диастем нет.

17. Отмечается к этому возрасту (5-6 лет) стертость бугров жевательной поверхности и режущего края, а постоянные зубы имеют хорошо выраженные бугры и бугорки.


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Обновлено 17.07.2014 14:10
 
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