dentinal caries Flashcards
why does enamel caries differ on smooth surface caries than in fissures?
because of the anatomy of the fissure.
what shape is the enammel smooth surface lesion?
cone shaped
The base of the cone is towards the enamel surface.
what happens with caries at the ADJ?
caries spreads lateraly along the junction to involve dentine in a larger area.
what is the shape of fissure lesions?
cone shaped but the base of the cone is at the ADJ. The fissure lesion broadens as it approaches dentine.
what shape is a dentinal carious lesion?
Roughly cone shaped.
Base towards ADJ.
Apex towards pulp.
how many zones does dentinal caries have and what are they?
5
Totally decomposed dentine.
Decalcified dentine with bacterial invasion.
Decalcified dentine - no bacteria.
Translucent dentine.
Normal dentine but early degeneration of odontoblastic process.
Histological (microscopic) appearance after cavitation of enamel?
the Bacteria have direct access to dentine.
Tissue becomes infected.
what causes root caries? and who is it most common found in?
Root surfaces become exposed to the oral environment by gingival recession.
Associated withperiodontal disease.
Commonly seen in olderpeople.
More vulnerable to mechanical and chemical destruction than enamel.
Cariogenic plaque is the essential pre-requisite.
what is root caries clinical picture?
Usually close to gingival margin.
In plaque stagnation areas.
The consistency of the lesion rather than its colour is the guide to its activity.
what should you avoid doing with root caries and why
probing should beavoided as should scaling.
Lesions are very vulnerable to mechanical damage
what teeth are most affected and least affected by root caries?
Mandibular anteriors seem to be least susceptible to root caries.
Increased prevalence in mandibular molars
Buccal and interproximal surfaces are more susceptible than palatal or lingual aspects of affected teeth
what are risk factors of developing root caries?
Recession
Abrasion
Oral hygiene
Diet
Periodontal surgery
Xerostomia
