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Samenvatting Prekliniek theorietoets A Materiaalkunde $3.75
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Samenvatting Prekliniek theorietoets A Materiaalkunde

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Samenvatting Prekliniek theorietoets A Materiaalkunde

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  • October 27, 2017
  • 9
  • 2017/2018
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By: finolav • 5 year ago

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By: elinegeerlings • 6 year ago

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Samenvatting materiaalkunde (periode 1 theorietoets a)
HC1- atoombouw en bonding
Atoombouw algemene principes
Bonding adhesie en retentie
Composietrestauraties samenstelling en eigenschappen

Materiaalkunde  - vakgebied dat zich bezighoudt met het verband tussen de
samenstelling/structuur en eigenschappen van materialen.
- Ontwikkeling van nieuwe materialen.


Atoombouw
Relatie russen bindingen, structuur en eigenschappen

Primaire bindingen sterk
1. Colavente binding: polymeren (kunsthars)
- Treed op tussen niet-metalen (H,F,CI,O,S,O,C
ect)
- Gedeelde electronenparen
- Vb: binding tussen monomeren



2. Ionbinding: keramiek (keramische kroon)
- Treed op tussen metalen (Ca,Ti ect) en niet-metalen
(O,P,F,PO4 ect)
- VB: - glazuur: hydroxyapatiet CA5(PO4)3OH
-zirkonium oxide ZrO2




3. Metaalbinding: metalen (gouden kroon, titanium
implantaat)
- Treed op tussen metalen (Au, Hg, Ag, Sn, Ti,)
- VB: gouden kroon, amalgaam restauratie,
titanium implantaat)

, Materiaalklassen op basis van primaire bindingen - Primaire
vs. Secundaire bindingen
- Seduncaire bindingen:
Zwak
Tussen moleculen
Van der Waals bindingen
Waterstofbruggen




Waterstofbruggen
- Basis voor de interacties tussen moleculen
- Essentieel voor THK (bv primer)
Poly(2-hydroxyethyl methacraylaat) (pHEMA)




Bonding
Hechting/adhesie is essentieel voor moderne THK

Adhesie de kracht die twee (chemische)
verschillende materialen aan elkaar bindt wanneer
deze met elkaar in contact worden gebracht

Adhesie tussen twee vaste stoffen
- Gering aantal contactpunten (denk aan
baksteen)
- Adhesie tussen vaste stoffen is
verwaarloosbaar(geen zin)
- Wel mogelijk met tussenstof  vloeistof
vorming moleculaire reacties

Adhesie tussen vaste stof en vloeistof
- Dicet contact
- Vorming van moleculaire interacties

Adhesieve verbinding tussen twee vaste stoffen




Vervullingen: additionele grensvlakken die adhesieve verbinding verzwakken

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