form • cavity filling:
ZOE, ZOP, silver amalgam……
cavity preparation
filling
7.prevention
• checking once a year
prevention
• pit and fissure sealing
characterstic
•the high incidence : 40-65% ↑ •a multifactorial disease •a chronic disease •hard tissues of tooth: (enamel,cementum,dentin) •an irreversible decay
1) pits and fissures of molars and bicuspids, 2) buccal and labial surfaces near the gingival line, 3) proximal surfaces that lie in the areas between the contact point and the gum.
√ Time
Certain time is needed for the carious process
Tetra-factor hypothesis
Host &t源自othmicroorganisms
caries
substrate
The four circle diagrammatically represent the parameters involved in the carious process. All four factors must be acting concurrently (overlapping of the circles) for caries to occur.
