dental caries causes and its treatment .pptx

caries

1. Dental caries Dr. Ayesha Khan Assistant professor, Operative Dentistry, De’Montmorency College Of Dentistry, Lahore.

2. Dental Caries

3. Learning objectives By the end of this presentation, students must be able to Define dental caries. Understand the pathogenesis and theories related to tooth caries.

4. Introduction Benjamin Franklin stated that : “Hot things, sweet things,sharp things, cold things rot the teeth and make them look like old things.”

5. D efinition

6. Historical Background on Caries Evidence for caries has been found in In paleophilic fishes(500 -570million years ago) Mesozoic dinosaurs(245-275million years ago)

7. Theories for Dental Caries Etiology

8. Worm theory- caries caused by worms llll The legend of the worm

9. Legends of the worms After Anu had created heaven, Heaven had created Earth, The earth had created rivers, The rivers had created marsh, Marsh had created the worm- The worm went, weeping before Shamash, His tears flowing before Ea , What will you give me for food? What will you give me to suck on? I will give you the ripe fig and apricot, What good are figs and apricot? Lift me up and assign me to the teeth and gums! I will suck the blood of the tooth, And I will gnaw its roots at the gums! Because you have said this, o worm, May Ea strike you with the might of his hand ! (William Mayne)

10. Endogenous Theory- The ancient greek “ theory of four body humors” .

11. Acid Theory In the 17 th and 18 th century, there emerged, a concept that caries is caused by acid formed in the oral cavity. The acid implicated is sulphuric acid, nitric acid and HCL caused by decomposition of food in saliva Robertson proposed that acid is formed by fermentation of food particles around the teeth

12. Parasitic Theory Early microscopic scraping of carious teeth by Antoni van Leuweenhoek (1673)indicated that micro-organism are involved in carious process

13. Millers Chemo parasitic Theory Microorganism Acid Enamel Demineralization Dental Caries

14. Proteolytic theory In 1944, Gottleib suggested that initial attack on enamel might be the destruction of organic material rather than demineralization by acid.

15. Keyes Triad

16. Pathogenesis of dental caries-Stephan curve Poor oral hygiene Microbes Diet-sugar Habits Enamel defects

17. Any Queries?