武汉大学：《牙体牙髓病学》课程PPT教学课件（英文版）龋病病因 Etiology of Dental Caries

Etiology of Dental Caries

Etiology of Dental Caries

The four circles Micro- diagrammatical organisms represent the factors inⅴ olved nQ carie care in the carious host Sub process. all four tooth strate factors must act nQ no concurrently caries carie (overlapping of the circles)for time caries to occur

The four circles diagrammatically represent the factors involved in the carious process.all four factors must act concurrently (overlapping of the circles)for caries to occur Micro￾organisms host & tooth Sub￾caries strate time no caries no caries no caries no caries

Host factor saliva What is saliva here mean? a. major saliva glands Saliva parotid, submandibular, sublingual b. minor gland C. gingival exudate

Host factor: saliva What is saliva here mean? a. major saliva glands Saliva parotid, submandibular, sublingual b. minor gland c. gingival exudate

Why saliva? 豢 Animal experiments Clinical observations

Why Saliva?  Animal experiments  Clinical observations

Animal experiment Effect of desalivation on caries in hamsters Group No hamsters Avg. no. Avg caries carious teeth score Intact salivary glands 20 4.0 Desalivated o 10 10.5 39.0 Parotid, submandibular, and sublingual glands

Animal experiment Group No. hamsters Avg. no. Avg. caries carious teeth score Intact salivary glands 20 2.3 4.0 Desalivated* 10 10.5 39.0 * Parotid, submandibular, and sublingual glands. Effect of desalivation on caries in hamsters

Clinical observations Xerostomia decreased or lack of salivary secretion Cause: therapeutic radiation salivary glands disorder (e.g. Sjogren syndrome) taking medicine

Clinical observations Xerostomia: decreased or lack of salivary secretion Cause: therapeutic radiation salivary glands disorder (e.g. sjogren syndrome) taking medicine

Clinical observation

Clinical observation

Caries in a patient with impaired salivary function as result of radiation therapy(courtesy of Drs Jansma and vissink. rug. the netherlands

Caries in a patient with impaired salivary function as result of radiation therapy (courtesy of Drs Jansma and Vissink, RUG, the Netherlands

The caries is different from common Decay offer seen in cervical area, a rapid demineralization over broad surfaces with no cavity. the huge change in quantity of saliva is responsible

The caries is different from common. Decay offer seen in cervical area, a rapid demineralization over broad surfaces with no cavity. the huge change in quantity of saliva is responsible

In xerostomia The amount of bacteria t The quality of plaque change S mutans, Lactobacillus, Yeast, Actinomyce t S sanguis, Veillonella, Neisseria

In xerostomia The amount of bacteria The quality of plaque change S.mutans, Lactobacillus, Yeast, Actinomyce S. sanguis, Veillonella, Neisseria