Hard tissues of tooth : Hard tissues of tooth



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tarix19.03.2017
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Hard tissues of tooth :

  • Hard tissues of tooth :

  • enamel,

  • dentine,

  • cement.



- - disease which develops after the teeth cutting and expressed by the demineralization and progressive destruction of hard tissues of tooth with formation of defect as a cavity.

  • - - disease which develops after the teeth cutting and expressed by the demineralization and progressive destruction of hard tissues of tooth with formation of defect as a cavity.



A dental caries is a «infection» of hard tissues of tooth, caused by acid produce bacteria

  • A dental caries is a «infection» of hard tissues of tooth, caused by acid produce bacteria





dental plaque, dental stone, certain features of feed of habitants of the modern countries (soft meal, use of sugar), hyposecretion of saliva, diminishing of parotin in saliva, violations of mineral exchange;

  • dental plaque, dental stone, certain features of feed of habitants of the modern countries (soft meal, use of sugar), hyposecretion of saliva, diminishing of parotin in saliva, violations of mineral exchange;

  • diminishing of calcium, phosphorus, fluorine in the teeth;

  • endocrine diseases, pregnancy, periods of change of baby teeth, pubescence.



remineralization of tooth hard tissues due to the receipt of salts from saliva;

  • remineralization of tooth hard tissues due to the receipt of salts from saliva;

  • formation of «barrier»:



An enamel struck at first by a caries is usually, farther dentine, rarer cement of tooth .

  • An enamel struck at first by a caries is usually, farther dentine, rarer cement of tooth .



Caries develops mainly on the lateral surfaces of the tooth crown.

  • Caries develops mainly on the lateral surfaces of the tooth crown.

  • (the area of damage of enamel has a form of cone, basis of which is oriented to the surface, apex - to the direction of dentinal-enamel connection.)



develops on the masticator surface of teeth. The area of damage of enamel has a form of cone also, but his basis is oriented to dentinal-enamel connection, and apex - to the masticatory surface of tooth.

  • develops on the masticator surface of teeth. The area of damage of enamel has a form of cone also, but his basis is oriented to dentinal-enamel connection, and apex - to the masticatory surface of tooth.

  • (At distribution of carious defeat from an enamel to dentine the vast area of dentine is damaged at once.)



makes progress more quickly than the enamel caries. Because the dentine contains calcium less than an enamel (70% and 96% accordingly)

  • makes progress more quickly than the enamel caries. Because the dentine contains calcium less than an enamel (70% and 96% accordingly)

  • contains dentinal tubules through which microorganisms and products of their vital functions can spread easy.



develops, as a rule, in senior people in which the tooth root is uncovered and cement contacts with the liquid of oral cavity.

  • develops, as a rule, in senior people in which the tooth root is uncovered and cement contacts with the liquid of oral cavity.



According clinico-morphologic displays they select 4 stages development of caries:

  • According clinico-morphologic displays they select 4 stages development of caries:

  • 1) stage of spot

  • 2) superficial

  • 3) middle

  • 4) deep.

  • According to character of passing:

  • a) rapid; b) slow.













  • 1. Circular caries at which a carious defeat is localized in the area of tooth neck, engulfing it circular. Such caries develops quickly and a transparent dentine (which is the Factors, slowing a caries) does not appear here.

  • 2. An early, subenamel caries develops directly under the layer of enamel.

  • 3. A lateral caries develops on the lateral surfaces of tooth as well as circular caries, but ran across him more slow.

  • 4. A stationary caries develops, as a rule, only in first molyare. A carious defeat is localized only in an enamel and does not make progress.

  • 5. Retrograde caries. Development of carious defeat begins from the side of pulp. A dentine is damaged at first, then enamel. Such caries can develop at festerings pulpits, when an exciter gets in pulp by haematogenic way, at traumas and anomalies of odontogenesis.





wedge-shaped (conic) defects







acid necrosis of teeth

  • acid necrosis of teeth





1st degree is a very weak defeat. On the lip and lingual surfaces of teeth no more than on 1/3 their areas observed poorly expressed separate shallow chalky spots and ribbons;

  • 1st degree is a very weak defeat. On the lip and lingual surfaces of teeth no more than on 1/3 their areas observed poorly expressed separate shallow chalky spots and ribbons;

  • 2nd degree is a weak defeat. The chalky spots and ribbons occupy near a half of the areas of teeth crown. There are separate pigmented spots, but a defeat is localized only in an enamel;

  • 3rd degree - a defeat is moderato expressed. More than on the half of surface of teeth spots are placed which meet between itself;

  • 4th degree is a heavy defeat. On the tooth surface separated and plural enamel erosions of different form appear. They can be colourless or pigmented (from yellow brown to black). In consequence of the mineralization violation of tooth hard tissues at the 3rd and 4th degrees of fluorosis defeat teeth become fragile, easily rub off away and destroyed.







disorders of blood- and lympho circulation;

  • disorders of blood- and lympho circulation;

  • atrophy;

  • necrosis;

  • dystrophy;

  • denticles;

  • intrapulp cysts.



acute

  • acute

  • chronic

  • chronic with acute condition

  • diffuse (total)

  • local:

    • crown
    • root.








Distinguish :

  • Distinguish :

  • local;

  • diffuse.

  • According to motion :

  • acute;

  • chronic (simple, (or ephithelial) granulema and cistogranulema);

  • chronic with acutening.



Granulematic periodontitis expressed by formation of granulosums in an apexes area of root, which are named apical granulosums.

  • Granulematic periodontitis expressed by formation of granulosums in an apexes area of root, which are named apical granulosums.

  • Distinguish the followings types of apikal granulosums:

  • 1) simple granulosum, 2) complexity or epithelial granulosum, 3) cystogranulema.









At hypertrophy gingivitis in gums productive inflammation develops with infiltration limphocytes and plasmaticcells, hyperkeratozis and by the acanthuses of multi-layered flat epithelium. .

  • At hypertrophy gingivitis in gums productive inflammation develops with infiltration limphocytes and plasmaticcells, hyperkeratozis and by the acanthuses of multi-layered flat epithelium. .

  • In acute periods in gums they find neutrophilic leucocytes infiltration & obese cells else.











  • dental raid;

  • odontolith (dental stone).



I degree - the bone edges of alveoli are diminished, on a height to 1/4 root size of tooth;

  • I degree - the bone edges of alveoli are diminished, on a height to 1/4 root size of tooth;

  • II degree - the bone edges of alveoli are diminished, on a height to 1/2 root size of tooth;

  • III degree - the bone edges of alveoli are diminished, on a height to 2/3 root size of tooth;

  • IV degree - is complete dissolve of bone tissue of alveoli, the apex of tooth root is placed in soft tissues of paradontium.



  • - formation of gums, which develops as a result of chronic irritation of tissues of gums by crown, stopping, root of the destroyed tooth. The formation develops more frequently than all on gums of incisivus, canine teeth, rarer on premolar and, as a rule, on a vestibular surface Epulis has a mushroom-like shape, sometimes rounded form, and sizes 0.5 – 2.0 sm in a diameter, rarely greater.





•angiomatic;

  • •angiomatic;

  • •fibrotic;

  • •giganticcells.



consists of connecting tissue with the plenty thin-walled vessels of sinusoid type and large or more small the amount of giant cells of osteoclast type and the little cells of osteoblast type. There are the plural little-nidus hemorrhage, nidus of haemosiderosis, that is why macroscopically such epulis has brown color.

  • consists of connecting tissue with the plenty thin-walled vessels of sinusoid type and large or more small the amount of giant cells of osteoclast type and the little cells of osteoblast type. There are the plural little-nidus hemorrhage, nidus of haemosiderosis, that is why macroscopically such epulis has brown color.



Thank You

  • Thank You



Kataloq: data -> kafedra -> internal
kafedra -> 1. Етиология и патогенез пиелонефриту
internal -> Аллергия – это имунологическая реакция организма на действие антигена или полуантигена (гаптена), которая сопровождается повреждением собственных тканей
kafedra -> Epidural hematomas are frequently followed by A. skull fractures
internal -> Остеоартроз
internal -> Introduction into the Infectious Diseases. Infections with fecal-oral mechanism of transmission. Infections with droplet mechanism of transmission. Tests
internal -> Анемия – это уменьшение количества эритроцитов и гемоглобина в единице объёма крови, которое сопровождается также качественными изменениями эритроцитов

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