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OTR > Tesuturi dure dentare > Flashcards

Tesuturi dure dentare Flashcards

1
Q

Grosime Smalt

A
  • 2,5-3 mm -cuspizi Molari
  • 2,3-2,5 mm cusp PM
  • 2 mm - mg incizala DF
  • 0,2 mm colet incisivi lat (IL)
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2
Q

Jonctiune SMalt-Cement

A
  • 60-65
  • 30
  • 5-10
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3
Q

Cele 3 roluri principale ale SMALTULUI?

A
  1. neutralizare forte masticatorii
  2. protectie tesut pulpar de excitatii fizice/chimice/termice
  3. rol in procesele functionale de triturare/teiere/formare bol alimentar
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4
Q

Duritate Smalt?

A

5-8 Mohs

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5
Q

Materiale conducataore de temperatura ce au nevoie de tratament adecavat al plagii?

A
  • amalgam
  • inlay metalic/Au
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6
Q

Stuctura chimica a Smaltului

A
  1. Substanta minerala: 95-98% din volum (87-91 din greutate)
  2. Substanta organica: 0,4 din volum (2% din greutate)
  3. Apa: 3,6-4% din volum -din care doar 1% apa libera (11% din greutate)
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7
Q

Componenta minerala din ce e formata?

A
  • 90% substante minerale ale smaltului- fosfati de Ca
  • 3%-fluoroapatita (mai putin solub in acizi org decat HA)
  • restul: carbonati, silicati, fosfati
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8
Q

Componenta organica a smaltului din ce e formata?

A
  1. Colagen (1/3 solubil)
  2. Fractiuni insolubile de lanturi polipeptidice
  3. Fractiuni solubile: proteine solubile, proteine serice, proteine legate de Ca, fosfoproteine, peptide cu AA, glucide, lipide
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9
Q

Nr de prisme de sm in functie de dinti

A
  • dd voluminosi- 12 milioane de prisme (Ms)
  • dd mini- 5 milioane de prisme (ILi)
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10
Q

Diametru prisma smalt

A

4-8 micrometri

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11
Q

Grosimi dentina

A
  • 3-7 mm–PM/M ocluzal
  • 3-5 mm- mg incizala
  • 3-5 mm- radacina
  • 3-4 mm- la colet
  • 1-3 mm- la apex
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12
Q

Culoare dentina DT/DP

A

DT-alb galbui

DP- glaben deschis

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13
Q

Duritate Dentina

A

5 Mohs (sm. e de 1.6x mai dur)

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14
Q

Nr canalicule Dentina radiculara si coletara

A

D radiculara- 8.000 canalicule

D coletara= 42.000 canalicule

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15
Q

Componenta chimica Dentina

A
  1. Mineral - 67%
  2. Organica= 20%
  3. Apa = 13%
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16
Q

Cat reprezinta componenta minerala a dentinei din volum si din greutate?

A

25% din volum

80% din greutate

17
Q

Compozitie componeneta miierala dentina

A
  • 28-35% Ca
  • 13-17 P
  • 3% carbonati
  • 1-2% Mg
  • <1%- Na, Cl, F, Si, Zn
  • alte elemente_St, Str, Pb, Fe, Mn
18
Q

Compozitie componeneta organica a dentinei

A
  • Matrice colagenica
  • colagenul dentinar are de 100x mai multe proteine decat in Smalt
  • Proteinele reprezinta 90% din matr organica
  • 10%=fractiune proteica insolubila (keratina dentinara)
19
Q

Care sunt tipurile de dentina?

A
  1. Mantaua Dentinara
  2. Dentina circumpulpara (D I)
  3. Dentina pericanalara
  4. Dentina intercanaliculara
  5. Dentina II (functionala)
  6. Predentina
20
Q

De cine e depusa Mantaua dentinara si ce grosime are ea?

A

este depusa de odontoblasti nepolarizati

7-30 micrometrii

21
Q

Intre cine se afla dentina circumpulpara?

A

intre manta si predentina

22
Q

Raport canale profunde/periferice in d. circumpulpara

A

4/1

23
Q

diametru canalicule d. circumpulpara

A

3-7 micrometrii

24
Q

Grosime dentina pericanalara

A

0,4-1,5 micrometrii

creste spre JA=D

25
Q

Care e cea mai mineralizata si cea mai hipomineralizata dentina?

A

hipo=mantaua

cea mai min= dentina pericanalara

26
Q

Grosime predentina

A

15-20 micrometrii

27
Q

procent colagen predentina

A

97% colagen tip V

28
Q

Grosime Cement

A

20-60 micrometrii la ICS

150-200 micrometrii la apex

29
Q

Duritate cement

A

x2,4 mai mica decat Sm

x1,4 mai mica decat Dentina

30
Q

Compozitie chimica cement

A
  • 50-55% organic
  • 45-50 % mineral (HA)

repartizte egal in volum

  • apa
31
Q

Compozitie minerala cement

A
  • =61% din greutate/ 31% din volum
  • fosfati+carbonati de Ca (ca cristale de HA aciculare)
  • F (mai mult decat in celalate tesuturi)
  • Mg(
  • alte elemente (Pb, Cu, Fe)
32
Q

Compozitie organica cement

A
  • matrice fibrilara colagenica
  • 90% colagen tip I
  • 5% colagen tip III
  • fibre reticulina in benzi
33
Q

Ce contine colagenul din cement?

A
  • hidroprolina
  • glicina
  • alanina
  • prolina
34
Q

de cate ori mai des e afectata mandibula decat maxilarul de hipercementoza?

A

de 4,5x

35
Q

Ce contin canaliculele dentinare?

A
  1. Prelungiri odontoblastice
  2. fibre colagen
  3. TN amielinice (plex Rasckow)
  4. fluid dentinar
36
Q
A

OTR (7 decks)

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