Invasive method of fissure pressurizing

The same stages are held as in the non-invasive method, but after the tooth preparation, the stage of fissure disclosure is performed with small diamond bur for high-speed handpiece. After the fissure was disclosed, it should be available for good visual examination and for next fissure pressurizing. Invasive method of fissure pressurizing differs from conventional carious cavity preparation by sparing teeth tissues preparation, especially enamel.

7. To prepare I class cavity by Black.

Class I –it is caries in pits and fissures; commonly used to refer to caries affecting the occlusal surfaces of premolars and molars. According to Black’s preparation, a cavity of the I class should be prepared with straight walls at right angle to the bottom, a shape of the cavity should be cylindrical, box-shaped, rhombic, X-like.

8. To prepare II class cavity by Black.

Class II – it is caries of the proximal (contact) surfaces of posterior teeth(molars and premolars). According to Black’s preparation, a cavity of the II class could be prepared in the shape of stairs (main and additional cavity that occupies the 1/3 – 1/4 length of the occlusal surface.): if there is no neighbouring tooth and the carious cavity is placed below the equator, it is prepared directly on the proximal surface. Peculiarities of a carious cavity disclosure of the II class according to Black preparation: an access is gained from unaffected occlusal surface.

9. To prepare III class cavity by Black.

Class III – it is caries in the proximal surfaces of anterior teeth (incisors, canines). According to Black’s preparation, a cavity of the III class should be prepared in a shape of triangle; if teeth are stand tightly one to another it is extended to the lingual surface, and an additional cavity is prepared there; in III class cavity an access is gained from a lingual surface, in some rare cases, from a labial surface.

10. To prepare IV class cavity by Black.

Class IV – It is caries in the proximal surfaces of anterior teeth and also including the incisal angle or cutting edge. According to Black’s preparation, a cavity of the IV class should be prepared in a shape of triangle. An additional cavity is prepared either in the area of incisal edge (when it is wide) or on the palatal (lingual) surface within the limits of dentine.

11. To prepare V class cavity by Black.

Class V – it is caries affecting the cervical surfaces. According to Black’s preparation, a cavity of the V class should be prepared in an oval shape, walls and bottom should be at the right angle, bottom is convex, because of pulp proximity at cervical area, thus preventing pulp exposure.

12. To prepare VI class cavity.

Class VI – caries-resistant zones of teeth- cusps and equator of the tooth. Usually decay is caused by abrasion (wear) and non-carious defects. It is prepared according to localization of defect.

13. To put treatment (therapeutic) lining

Therapeutic lining: Indications: 1) in the case of deep dental caries (indirect capping); 2) to the exposed pulp horn (direct capping).

Available materials: calcium hydroxide paste (“Life”)

Technique: lining is placed to the deepest part of carious cavity or directly to the exposed pulp horn in a thin layer (0,3 mm). In the case of deep dental caries, lining is placed for 14 days for providing remineralising action to dentine → upon treatment lining a temporary filling is placed (dentine paste); II appointment – if dentine is hard while probing and remineralised, so final restoration can be placed.