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Class III cavity preparation

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Preparation step Instruments used Anatomy peculiarities of deciduous teeth Special peculiarities of performing the step in primary teeth Anatomical peculiarities of permanent teeth with unformed root Special peculiarities of performing the step in permanent teeth with unformed root Special peculiarities of performing the step for filling with glass ionomer cement Special peculiarities of performing the step for filling with composites
Bonding to the enamel (self-cured) Bonding to the enamel and dentine (light cured)
Cavity opening Fissure, round, wheel-formed, neverse-conical burs in high-speed hand-piece Low hardness of primary teeth tissues Careful preparation, possible opening from the vestibular surface (esthetics is of secondary importance) Low hardness of primary teeth tissues Careful preparation, with water-cooling Tissue-saving Maximal saving of enamel Possible opening from the vestibular surface, cut the enamel without dentine beneath it
Cavity widening Fissure, conical burs Low hardness of primary teeth tissues, thin enamel and dentin layers Careful preparation, keep in mind the pulp chamber   Low hardness of primary teeth tissues, thin dentin layer Careful preparation, keep in mind the pulp chamber No need in preventive widening   Save the dentin beneath the enamel
Necrectomy Excavator, round burs in high-speed hand-piece Low mineralization of dentin, thin dentin layer, little of no reparative dentine Careful preparation, use mostly excavator, keep in mind the pulp chamber Low mineralization of dentin, thin dentin layer, little of no reparative dentine Careful preparation, keep in mind the pulp chamber Tissue-saving Prepare up to the sound dentin Prepare up to the sound dentin to ensure a quality bonding and cosmetic effect  
Cavity formation Neverse-conical, fissure burs Thin enamel and dentin layers, little of no reparative dentine Possible formation of the accessory cavity on vestibular surface, in cervical low-mineralized part. Proximity of the pulp chamber (dentin depth of the axial wall –0,5mm, no retention points in direction of pulp) Low hardness of primary teeth tissues, thin dentin layer, little reparative dentine Keep in mind the pulp chamber Possible formation without retention points, without additional cavities, tissue-saving preparation Classical formation with maximal saving of sound enamel Possible formation without retention points, without additional cavities, cut the enamel with no underlying dentin
Preparation of enamel edges Fissure, conical, fire-like diamond head of finishing bur Thin enamel layer Careful preparation with burs     Finishing of the edges without formation of the falc Falc formation with a great surface Falc formation

 

 



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Вимоги до знань та вмінь. | Геологічна зйомка навчального полігону | Застосування геофізичних та гідрогеологічних досліджень при геологічній зйомці | CONTENTS | Glass-ionomer cements. | Techniques of filling of carious cavities of the II-nd class in temporary and permanent teeth by stomatologic cements and an amalgam. Restoration of contact point. | Dental adhesive systems | Filling techniques for class II, III and IV cavities in temporary and permanent teeth. Restoration of proximal contact and tooth crown anatomy. | Modern endodontic instruments | Filling materials for temporary and permanent obturation of root canal. The techniques of temporary and permanent filling of root canal concerning the stage of tooth development. |

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