Presentation on theme: "Ternopil State Medical University"— Presentation transcript:
1Ternopil State Medical University named by I. HorbachevskyyTopic. Classification of cavities by Black. Basic principles of cavities preparation. Stages and features of the conventional preparation of carious cavities depending on the class. Modern methods of cavity preparation for composite materials. Alternative methods of preparation.Department of Therapeutic DentistryLecturer: Levkiv Mariana
2DefinitionDENTAL CARIES is an irreversible microbial disease of the calcified tissues of the teeth that occurs after theirs eruption; is characterized by demineralization of the inorganic portion and destruction of the organic substance of the tooth, which often leads to cavitation.
3Schematic diagram to demonstrate the requirement for diet, bacteria and dentition to interact together over time to initiate caries.
5Classification of dental caries 2. The anatomical:• -caries of enamel• -caries of dentine• -caries of cement
6Classification of dental caries 3. Based on localization:-fissures and pits-proximal-in the cervical part(circulating)
7Classification of dental caries 4. Based on a severity of disease:• -acute• -chronic• -plural (rampant)• -secondary• -arrested (stopped)Chronic course ofsuperficial caries
8Classification of dental caries 5. Based on an intensity of lesion:• -a compensated• -a sub-compensated• -a decompensated
9Classification of dental caries 6. Based on the presence of complications:• -simple• -complicated7. Black’s classification
10Carious cavity classification Simple cavityCompound cavityComplex cavityFeatureA cavity involving only one tooth surfaceA cavity involving two surfaces of toothA cavity that involves more than two surfaces of a tooth
11Abbreviations of Tooth Surfaces Simple: cavity involving one tooth surfaceI: incisalM: mesialD: distalB: buccalO: occlusalF: facial
12Abbreviations of Tooth Surfaces Compound: two tooth surfacesDO: disto-occlusalMO: mesio-occlusalMI: mesio-incisalDI: disto-lingualLI: linguo-incisalDL: disto-lingualOB: occlusobuccal
14Black’s classiﬁcation It was based on the knowledge and evidence available at the time of Black, early 20-th of 20 century and is still used by some people today despite its limitations: it only refers to carious lesions and does not include root or secondary caries.
15Cavity (Caries) Classifications Class I (Simple)Developmental cavities in pit and fissures of teeth located in:Occlusal surfaces of posterior teethBuccal or lingual pits on the molarsLingual pit near the cingulum of the maxillary incisors
16Cavity (Caries) Classifications Class II (Compound, Complex)Proximal surfaces on the posterior teethMO restorationMOD restoration
17Cavity (Caries) Classifications Class III (Simple)Interproximal surface of anterior teeth
18Cavity (Caries) Classifications Class IV (Compound)Interproximal surface of anterior teeth and include the incisal edge
19Cavity (Caries) Classifications Class V (Simple)Cervical third of the facial or lingual surface of the toothOccurs because patient often sucks on sweets
20Cavity (Caries) Classifications Class VI ( Simon’s modification) (Simple)Not part of original standard classificationLater identified in order to more clearly label cavities that involve the incisal or occlusal surface worn away from abrasion
21Black’s principles of cavity preparation Black suggested that it was necessary to:■ remove additional tooth structure to gain access and visibility;■ remove all trace of demineralised enamel and dentine from the floor, walls and margins of the cavity;■ make room for the insertion of the restorative material in sufficient bulk to provide strength;■ provide mechanical interlocking retentive designs;■ extend the cavity to self-cleansing areas to avoid recurrent caries.
24What is cavity preparation? Preparation is aimed at dissection of decayed dental hard tissues in order to stop further progression of the caries process and the creation of necessary conditions for reliable fixing of filling material, restore anatomical shape and function of the tooth.Principles of cavities preparation :The principle of "extension for prevention" (Black)The principle of "biological suitability" (Lukomskyj).
26Common stages of dental hard tissues preparation - Anaesthetizing- Disclosure (opening and extension) of carious cavity- Necrectomy- Formation of the carious- Finishing (smoothing) the edges of enamel
28General rules for the preparation of cavities - transition of the carious cavity bottom (the surface which is turned to a pulp) to the wall should be at right angle- transition of one wall to another should be at a right angle –the shape of the cavity- is box- shaped form (except the V class)- enamel edges should be straight and smooth- bottom of the cavity should be flat or somewhat remind the form of the occlusal surface of the tooth