dh220 dental materials lecture #2 prof. lamanna rdh, ms
TRANSCRIPT
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DH220 Dental Materials
Lecture #2
Prof. Lamanna RDH, MS
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Restorative Dentistry
Intermediary Materials:Dental Cements, Temporary Restorations
& Periodontal Dressing
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The tooth is prepared and an intermediary material is placed.
What is the purpose of placing intermediary materials? Answer
Where are intermediary materials placed? Answer
Next
A. Which of Black’s Classification is this caries?
B. Which of Black’s Classification are these preparations?
1 23
AnswerAnswer
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Varnish1. Composition: resin = natural
or synthetic
2. Use: seal dentinal tubules, prevent chemical irritation to the pulp, and migration of metallic ions.
3. Application: 2 thin coats
4. Location: floor & walls in prep.
5. Special characteristics:
- Rapid evaporation due to solvent; during use the cap must be replaced immediately.- Easily abraded, negating functional purpose.- Should not be used with composite or resin restoration; inhibits proper curing.
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Liner1. Composition: Ca(OH)2*, ZOE, GI
2. Use: prevent bacterial invasion; chemical irritation; pulp cap - *Ca(OH)2
only.
3. Application: thin layer
4. Floor of prep, dentin only
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5. Special characteristics:
Ca(OH)2 – 1. bacteriostatic – inhibits bacterial spread 2. ↑ pH (11) – stimulus for 2° dentinal formation 3. ↑ solubility – used only in the deepest portion
of the cavity prep. – closest to the pulpal horn 4. compatible with ALL restorative materials
Glass Ionomer – 1. releases fluoride for therapeutic advantage (anticariogenic effect) 2. direct (chemical) adhesion to enamel, dentin, and cementum.
3. radiopaque
ZOE – 1. non-irritating to pulp – eugenol has a soothing (obtundent) effect on the pulp.
2. not utilized as a direct pulp cap – eugenol in a high concentration can be toxic to the pulp.
3. not used under composite restor. – interferes with polymerization.
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Base1. Composition: ZOE, GI,
ZOP, Zinc Polycarboxylate
2. Use: thermal/elect. insulator, replacement for missing dentin, mechanical support for restoration
3. Application: Thick layer
4. Location: floor of prep,dentin only.
base
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5. Special characteristics:
ZOP - 1. Acidic cement – chemical irritant to the pulp – used in conjunction with calcium hydroxide liner in deep cavities (< 1mm dentin remaining) 2. very specific mixing technique:
• mixed by increments (cut into several sections of powder) • allows for exothermic reaction (release of heat)
Zinc Polycarboxylate –
1. direct (chemical) adhesion to enamel, dentin, and cementum. 2. polyacrylic acid – not as irritating to the pulp as phosphoric acid 3. not as strong as ZOP
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Varnish, Liner, & Base Application
varnish
base
liner
*if pulpal exposure –Ca(OH)2 onlyas pulp cap
*
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Cement1. Composition: ZOE, GI, ZOP,
Zinc Polycarboxylate, andResin cement
2. Use: luting agent
3. Application: runny, loose
4. Location: inside crown, bridge,etc.
5. Special Characteristics:Resin cement:
1. material of choice for luting.
2. requires use of etching agent.
3. mechanical retention to enamel by acid-etch technique
p. 94
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Maryland Bridge
1. Facial view of bridge
2. Lingual view – luted with resin cement
1
2
pontic
1
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Weakest point of a crown is the margin. Always carefully evaluate the margin for washout when dental charting your patients.
Marginal washout
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Identify the following intermediary materials: liner, base, or luting agent.
1
2
Answer
3
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Composition:ZOE, ZOP, Zinc Polycarboxylate,
GI, and Resin Cement
** Review the typed handout for the composition of these five materials**
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Differences between these materials??????
1. Consistency of the mixture – ex: thin, thick
2. Intended use by the clinician – ex: liner, base
3. Powder particle size – ex: small, large
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Temporary & Interim RestorationsI. Temporary Restorations –
A. Use: - provisional for short term – days, weeks.
- pulpal healing for determination of treatment (ie: endo.)
- fabrication of lab work.
B. Material: - ZOE – obtundent effect ** not used if composite is placed!!!
- GI, ZOP, etc. WHY??
Answer
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II. Interim Restorations –
A. Use: - provisional for long term – months, up to a year.
B. Material:
- preformed crowns – stainless steel or aluminum
- crowns & bridges – acrylic (polymer)
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Periodontal dressing
1. Use: patient comfort from possible injury after surgery, undisturbed healing, reduce possibility of 2º bleeding & infection, and acts as a splint.
2. Composition: zinc oxide & non-eugenol paste - most commonly used material.
3. Handling: Lab
4. Placement: Lab
5. Ingredients: any item listed cause concern??
(p. 7 in typed handout)
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1. Before surgery
4. After surgery
2. 3. Placement and removal
of dressing
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Mixing TechniqueReference Dental Materials Lab
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ZOP
Glass ionomer -pull test for luting consistency
ZOP – mixed for a base consistency
Mixing & handling guidelines – see separate handout in your Lab workbook p. 53 - 56.
Just a few -
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** Review the handout for special characteristics of each material in Lab workbook (p. 53 + 54).
It’s show time……mixing dental cements.
Visit www.edpuzzle.com to view 8 very short videos on the mixing techniqueof intermediary materials, pulp cap and periodontal dressing.
Mixing Glass Ionomer Mixing ZOP