Classificatiorhacc. to Black
Class I.
Pit and fissure caries
lenka.roubalikova@ti scali.cz
Classificatiorhacc. to Black
• Class II.
Proximal surfaces in pre
lenka.roubalikova@ti scali.cz
Classification acc. to Black
Class III.
Proximal surfaces of incisors and canines without
lost an incisal ridge
lenka.roubalikova@ti scali.cz
Classificatiorhacc. to Black
Class IV.
Proximal surfaces of incisors and canines with
lost an incisal ridge
lenka.roubalikova@ti scali.cz
Classificatiorhacc. to Black
Class V. cervical lesions
lenka.roubalikova@ti scali.cz
5
Bastedles preparation
of cavities
Access to the cavity ^Xsxv Outlines - cavosurface margin (extention for prevention) Retention Resistance
Excavation of carious dentin Preparation of borders - finishing Control
lenka.roubalikova@ti g scali.cz
J*
Úprava sklovinných stěn
lenka.roubalikova@ti
scali.cz
Protection of dentin wound
•   Dentin wound - open dentin tubules -movement of dentinal liquor - hydrody effect.
Phycial rasons
-thermal
-osmotic
Chemical reasons Combination
namic
lenka.roubalikova@ti scali.cz
Protection of dentin wound
Isolation Base Lining Subbase
Adhesive systems (explanation! later)
lenka.roubalikova@ti scali.cz
17
Maki Railings
Filling replaces lost hard dentalü tissue anatomically and functionally
Always different properties in comparison to hard dental tissues.
lenka.roubalikova@ti scali.cz
18
Lining
Preparation^the cavity l.st
class acc. to Black
Cavities in fissures and pits^^
(Occlusal surfaces of premolars molars and in f. coeca)
F. Coeca: buccal surfaces of lower 1 molars,
Palatal surfaces of lower molars, palatal surfaces od canines.
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 linaual surfaces of molars.
Materials: Amalgam^Gomposite.
Amalgam: Pertinent material qualities and'propeties
Strength Longevity Ease of use Clinically proven sucess
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 surfac Foundations
Abutmjent teeth for removable partioal dentures Temporary or caries control restorations.
Contraindications
Aesthetically prominent areas of posterior teeth
Small moderate classes I. that cart b well isolated
Access tcMtie cavity
From the occlusal surface using the fissure bur (or diamond burs, s below).
Outline
Ideal outline includes all occlusal pits and fissures. If crista transvers obliqua are no affected, it is recommended no to prepare them
Vytvořen nob rysu kavity a
eventivní extenze
Kavita zaujímá veškeré rýhy ústící d Ložiska (kavita kopíruje fissurální komplex). Crista obliqua nebo crista transversa se ponechává, není - li zasažena kazem.
Kavity na molárech
Zachování crista obliqua
6       7 8
Retention principles
Prepare the box - the bottom is ip dentin
Undercuts can be prepared, the proximal ridges must not be weakened
Retentiorhprinciples
Box in dentin
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 withoU removing dentinal support.
Never leave the enamel undermined
All corners are round, the bottom smooth.
Removal of carious, infected, dentin and remaining defective
enamel.
Spoon excavator or a slowly revolving , round carbid bur of appropriate size
Finishing and polishing
• Fine grit diamond bur. \^
Preparatldrhof borders and
final check
Smoother! (red coced diamond
F.Coecum
Preparation islimited on carious lesion only undercts
Preparationfor composit
Cavity is limited on the carious legion
It has a form of deeper dish
No undercuts
More single cavities can be prepared
Preparation^ inlay
Inlay is a rigid filling
It is fabricated out of oral cavity inMental lab ^
It is luted into the cavity using luting material -cement
Preparation is different - the walls are divergent
For inlay
For amalgam For composit
I n fay s
• Rigid fillings
• Manufactured in a dental lab
• Direct or indirect method
- Direct method rarely
- Indirect method most common
Inlay
• Crown inlay \^ - a part of a clinical crown is replace
Root canal inlay 1
The inlay is cemented into the root canal and replaces a crown (abutment tooth - stump, snag)
CrowUHJilay
> Composit
> Ceramics
> Metal Alloys
Crown irilays
Indikations
• A big lost of dental tissues
• Big interdental spaces
• Next to the crowns and bridges made of metal alloy
CrowrHqlays
Contraindication
1. Too small - shallow (flat) cavities
2. High caries risk
3. Frontal area (metallic)
Angle of conyergency
> 0° - maximum
> 6° - very good
> 15°- acceptable
> 20° - insuficient
Optimum 6° - 15°.
BasicTtiles of cavity preparation
>Box
> No undercuts
> Light divergence of the walls (facilitatin shape)
\Box
Underc
Simple box
Facilitating form
Inlay of metal alloy
• Direct method
• Indirect method
nlay ofrhetal alloy
> Direct method
Direct modellation in the mouth Special wax - casting wax, (special polymers) Sprue pin Investment
Method of the lost wax
Inlay of metal alloy
Direct method
> Central cavities (class L, classs V.)
> Root canal inlays
Inlay of metal alloy
Indirect method
Taking of the impression Model
Modellation of the casting wax, (special polymers) Sprue pin Investment
Method of the lost wax
Aesthetic inlays - composite materials, ceramics
Special procedure Indirect method always
CAD/CAM technology posible
Protection ofidentin wound
Against thermal or electric irritation
Against chemical irritation
Protection oíidentin wound
Base - zinc phosphate cement
Calcium hydroxide - caries next to dental pulp