Definujte zápatí – název prezentace nebo pracoviště1
Preclinical dentistry I.
Class I.
2
Classification acc. to Black
̶ Class I.
Pit and fissure caries
3
Classification acc. to Black
̶ Class II.
Proximal surfaces in premolars and molars
4
Classification acc. to Black
̶ Class III.
Proximal surfaces of incisors and canines without lost any part if
incisal edge
5
Classification acc. to Black
̶ Class IV.
Proximal surfaces of incisors and canines with
lost an incisal ridge
6
Classification acc. to Black
̶ Class V. cervical lesions
7
Preparation of cavities
Access to the cavity
Outlines – cavosurface margin (extention for
prevention)
Principles of retention
Principles of resistance
Excavation of carious dentin
Preparation of borders – finishing
Control
8
Protection of dentin wound
̶ Dentin wound should be covered – protection of dental pulp
against irritation
Physical
-thermal
-osmotic
Chemical
Combination
9
Protection of dentin wound
Isolation
Filling (small cavities)
Base (moderate – large cavities- depth 2mm and
more approx.)
Adhesive systems ( composite materials)
10
Filling
̶ Filling replaces lost hard dental tissue anatomically and
functionally
̶ Always different properties in comparison to hard dental tissues.
Preparation of the cavity I.st class acc. to
Black
̶ Cavities in fissures and pits
̶ (Occlusal surfaces of premolars and molars and in f. caeca)
F. Caeca: buccal surfaces of lower molars,
Palatal surfaces of lower molars, palatal surfaces of upper incisors
(mostly lateral)
All pit and fissure restorations
(fillings)
They are assigned in to three groups.
R. on occlusal surface of premolars and molars
R. in foramina caeca – usually on occlusal two thirds
of the facial and lingual surfaces of molars.
R.on lingual surface of maxillary incisors.
Morphology
of fissures
Biofilm
Caries
Materials: Amalgam, composite.
Amalgam:
Pertinent material qualities and propeties
Strength
Longevity
Easy of use
Clinically proven sucess
Access to the cavity
̶ From the occlusal surface using the fissure bur (or diamond burs,
see below).
Cavosurface margin
̶ Ideal outline includes all occlusal pits and fissures. If transvers
ridge (1st lower premolar) or oblique ridge (1st and 2nd upper
molar) are not affected, it is strongly recommended not to prepare
them.
Mandibulary 7
Mandibulary
6
vestibulary
orally
First upper molar
Oblique ridge
Third molars - variable
½ distance between the botom of the fissure
and the cusp
Retention
̶ Box – undercut (1,5 – 2 mm deep).
Box
Undercut
Resistance
Depth 1,5 – 2 mm
The enamel is always supported with dentin
The cavosurface margin till ½ distance of the
bottom of the fissure and the cusp
No sharp edges
Resistance
̶ Proximal ridges must not be undermined!
Definujte zápatí – název prezentace nebo pracoviště28
Excavation of carious dentin
̶ Round burs : 3000/min
̶ Excavators
Orientation of the pulpal wall
Finishing
Fine diamonds
Final check
Good illumination, dry field, magnification.
Direct and /or indirect view
Probe
Oblique ridge
6 7 8
6 7 8
Molars
Foramen caecum:
Preparation is limited on carious lesion
The bottom is located in dentin
Undercuts
Finishing of cavity borders
If the enamel is undermined
occlusally – extention on occlusal surface
Preparation with
preservation of the
transverse ridge
Premolars Crista transversa (transvers ridge)
Lower P1
lenka.roubalikova@tiscali.cz
40
Base is made usually
of zinkoxidphosphate cement
It is placed only on pulpal wall