Classification acc. to Black - Masarykova univerzita · PDF file2 Classification acc. to Black...
Transcript of Classification acc. to Black - Masarykova univerzita · PDF file2 Classification acc. to Black...
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lenka.roubalikova@ti
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Classification acc. to Black
Class I.
Pit and fissure caries
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lenka.roubalikova@ti
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Classification acc. to Black
Class II.
Proximal surfaces in premolars and molars
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lenka.roubalikova@ti
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Classification acc. to Black
Class III.
Proximal surfaces of incisors and canines
without
lost an incisal ridge
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lenka.roubalikova@ti
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Classification acc. to Black
Class IV.
Proximal surfaces of incisors and canines with
lost an incisal ridge
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Classification acc. to Black
Class V. cervical lesions
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Basic rules preparation
of cavities
Access to the cavity
Outlines – cavosurface margin (extention for
prevention)
Retention
Resistance
Excavation of carious dentin
Preparation of borders – finishing
Control
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lenka.roubalikova@ti
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Úprava sklovinných stěn
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Protection of dentin wound
Dentin wound – open dentin tubules –
movement of dentinal liquor – hydrodynamic
effect.
Phycial rasons
-thermal
-osmotic
Chemical reasons
Combination
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Protection of dentin wound
Isolation
Base
Lining
Subbase
Adhesive systems (explanatiom later)
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Making fillings
Filling replaces lost hard dentalů tissue
anatomically and functionally
Always different properties in comparison
to hard dental tissues.
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Lining
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Base
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Preparation of the cavity I.st
class acc. to Black
Cavities in fissures and pits
(Occlusal surfaces of premolars and
molars and in f. coeca)
F. Coeca: buccal surfaces of lower
molars,
Palatal surfaces of lower molars, palatal
surfaces od canines.
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All pit and fissure restorations.
They are assigned in to three groups.
R. on occlusal surface of premolars and molars
R. in foramina coeca – usually on occlusal two thirds
of the facial and lingual surfaces of molars.
R.on lingual surface of maxillary incisors.
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Materials: Amalgam, composite.
Amalgam:
Pertinent material qualities and propeties
Strength
Longevity
Ease of use
Clinically proven sucess
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Indications
Moderate to large restorations
Restorations that are not in highly aesthetics areas
Restorations that have heavy occlusal contacts
Restorations that cannot be well isolated
Restorations that extend onto the root surface
Foundations
Abutmjent teeth for removable partioal dentures
Temporary or caries control restorations.
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Contraindications
Aesthetically prominent areas of
posterior teeth
Small moderate classes I. that can be
well isolated
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Access to the cavity
From the occlusal surface using the
fissure bur (or diamond burs, see
below).
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Outline
Ideal outline includes all occlusal pits
and fissures. If crista transversa od
obliqua are no affected, it is
recommended no to prepare them.
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Cavosurface margin
All fissures in contact with caries lesion
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Kavita sahá do ½ úbočí hrbolků
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Zachování crista obliqua
6 7 8
6 7 8
Kavity na molárech
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Kavity na premolárech Zachování crista transversa
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Retention principles
Prepare the box – the bottom is in
dentin
Undercuts can be prepared, the
proximal ridges must not be weakened!
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Retention principles
Box in dentin
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Resistance principles
Box – space for amalgam 1,5 – 2 mm
Keep the facial and lingual margin extensionsas minimal as possible between the central groove and the cusp tips.
Extending the outline to include fissures, thereby placing the margins on relatively smooth sound tooth structure.
Minimally extending into the marginal ridge without removing dentinal support.
Never leave the enamel undermined
All corners are round, the bottom smooth.
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Removal of carious,
infected, dentin and
remaining defective
enamel.
Spoon excavator or a slowly revolving ,
round carbid bur of appropriate size.
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The pulpal wall and pulp chamber
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Correct direction of the bur
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Finishing and polishing
Fine grit diamond bur.
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Preparation of borders and
final check Smoothen (red coced diamond)
20.000 rpm.
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F.Coecum
Preparation islimited on carious lesion only
undercts
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Combination of
Cavity in f.coecum
and occlusal cavity
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Preparation for composit
Cavity is limited on the carious lesion
It has a form of deeper dish
No undercuts
More single cavities can be prepared
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Minikavity
Otevírání fissur
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Preparation for inlay
Inlay is a rigid filling
It is fabricated out of oral cavity in dental
lab
It is luted into the cavity using luting
material -cement
Preparation is different – the walls are
divergent
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For inlay
For amalgam
For composit