Denture Manual 81- (Heat vs Chemical Cure) Flashcards Preview

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Flashcards in Denture Manual 81- (Heat vs Chemical Cure) Deck (37)
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Heat-activated resin composition (pg 87)
- Powder (2 components)
- Liquid (3 components)

2. Benzoyl peroxide (initiator)

1. Unpolymerized MMA (monomer)
2. Glycol dimethacrylate (cross-linking agent)
3. Hydroquinone (inhibitor)


What is the initiator for both heat resins? (pg 87)

Benzoyl peroxide


What is the cross-linking agent for heat-activated resins?

Glycol dimethacrylate


What does hydroquinone do? (pg 87)


- Prevents polymerization of the monomer liquid during storage


What is the activator for heat-activated resin denture bases? (pg 88)

What is the activator for chemically-activated resin denture bases?

Heat (165 F or 70 C degrees for 8 hours or longer)

Dimethyl-para-toluidine (tertiary amide)


How does heat actually "activate" the process of heat-activated resin denture bases? At what temperature does this start? (pg 88)

Heat decomposes the benzoyl peroxide into a free radical to start the polymerization

Starts at 60 degrees, but you do the entire reaction at 74 C degrees


High impact strength resins are reinforced with what? (pg 88)

Give one example of this resin

Rubber (butadiene-styrene rubber particles are grafted to the methyl methacrylate to bond to the acrylic matrix)

Lucitone 199


What are the two recommended polymerization cycles for heat-activated resin? (pg 88)

Long cure: Constant 74 degrees C for 8+ hours, then 100 degrees C for 1 hour, then bench cool 1 hour

Short cure: 74 degrees C for 2 hours, then increase to 100 degrees C, then hold at 100 degrees C for 1 hour, then bench cure 1 hour


Chemically-activated resin composition (pg 89)
- Powder
- Liquid

2. Benzoyl peroxide (initiator)

1. Unpolymerized MMA (monomer)
2. Glycol dimethacrylate (cross-linking agent)
3. Hydroquinone (initiator)
4. Dimethyl-para-toluidine (activator)


Chemically-activated resin's
- Advantages
- Disadvantages (3)

Advantage: Faster working time

Disadvantages: (Diewitt's note: I think these are before Ivobase was introduced)
1. Chemical cure has more residual monomer (irritates the tissue
2. Decreased strength
3. Less color stability


Light-activated resin composition
- Two major constituents
- Three minor constituents

1. UDMA (urethane dimethacrylate - the resin matrix)
2. Inorganic filler particles (quartz)

3. Coupling agents (bonds filler particles to the resin matrix
4. "Activator-initiator" system (UV light - activator) and (champhoroquinone-initiator)
5. Optical modifiers (color - metal oxides)


At what temperature does acrylic monomer boil? How about water? (pg 92)

What does boiled acrylic monomer lead to?

Is this a major concern for thin or bulky areas of the denture?

213.4 degrees F for acrylic, compared to 212 degrees F for water

This leads to porosities in the denture base

Trick question - It is a major concern for both areas since the reaction is exothermic. For thick areas, this may lead to porosities. For thin areas, this may lead to incomplete curing.


Who developed the BULL rule? (pg 98)



Combination case syndrome AKA Kelly's Syndrome (9) (pg 105)

1. Papillary hyperplasia
2. Anterior maxillary ridge resorption
3. Extrusion of lower anterior teeth
4. Downgrowth of maxillary tuberosity and pneumatization of maxillary sinus
5. Posterior mandibular ridge resorption
6. Loss of OVD
7. Anterior repositioning of mandible and TMJ remodeling
8. Occlusal plane discrepancies
9. Epulis fissuratum


Which authors advocated for the use of gold occlusals?

Koehne and Morrow 1970


Advantages of immediate dentures (8)

1. Bleeding, pain, and swelling reduced
2. Patient is not without teeth during healing period
3. Cooperation and emotional attitude of patient is improved
4. Patient adapts to the presence of immediate dentures more quickly
5. Individuals appear to function in speech, deglutition, mastication, and respiration sooner
6. Esthetics, speech, and tooth arrangements are obtained by comparison to natural teeth
7. Locations of occlusal plane and VDO are more easily ascertained
8. Immediate dentures contour bone


Disadvantages of immediate dentures (5)

1. Loss of proprioception
2. Psychologically devastating
3. Loss of function/efficiency
4. Technically difficult
5. No esthetic try-in appointment


Contraindications of immediate dentures (4)

1. Patients with debilitating diseases
2. Patients for whom multiple extractions might be unwise
3. Emotionally disturbed individuals
4. Indifferent or unappreciated patients


Cause/treatment if generalized sore spots at ridges (3 causes) (pg 133)

Cause -> Treatment

1. Malocclusion -> Patient remount

2. Excessive OVD -> remount to lower OVD or make new CD's

3. Inaccurate denture base -> Reline, rebase, or new CD's


Cause/treatment if sore mouth (3 causes) (pg 133)

Cause: systemic / alcoholism / psychological

Treatment: Rule out dental origin and refer accordingly


Cause/treatment for immediate gagging (3) (pg 134)

Cause -> Treatment

1. Border overextended, underextended, too thick -> Reduce or add to border

2. Excessive OVD -> remount, adjust to lower OVD or remake RCD

3. Overextended mandibular flange -> disclosing wax, reduce, and polish


Cause/treatment for delayed gagging (4) (pg 134)

1. Inadequate PPS -> Reestablish, process, remount & polish

2. Malocclusion -> Patient remount

3. Poor retention -> Reline & remount

4. Alcoholism -> Refer


Cause/treatment of burning sensation at localized areas

Cause: Pressure on nerve anatomy (such as anterior palatine foramen, mental foramen, or posterior palatine foramen)

Treatment: PIP & relieve


Cause/treatment of generalized burning sensitive (2) (pg 134)

Cause -> Treatment

1. Denture base allergy -> : If completely cured denture base then refer out to allergy clinic for verification

2. Ill-fitting dentures -> Reline, rebase, or remake


Cause/treatment of burning tongue (4)

Causes: Systemic problem, vitamin deficiency, endocrine, psychological

Treatment: Refer to confirm


Cause/treatment of trouble swallowing (2)

1. Mand posterior lingual flange or max posterior border overextended/too thick -> Reduce or thin

2. Excessive OVD -> Remount & adjust for lower OVD / make new CD's


Cause for clicking of denture during speech

Excessive OVD or poor retention


Cause/treatment of clicking of denture during swallowing or at termination of speech (2)

1. Mandibular CD overextended in retromolar pad areas -> Adjust, but make sure the retromolar pad is covered

2. Porcelain teeth -> Replace with resin teeth


Cause/treatment of whistling (2) (pg 136)

1. Palate too narrow -> Make palatogram (PIP) and grind to widen
2. Maxillary premolars too far medially -> Reset teeth


Cause/treatment of S sounding like Sh (2) (pg 136)

Bonus question - What kind of "sounds" are these?

1. Anterior palate too broad -> Add wax/rugae and process

2. Incorrect closet speaking space (ala Pound) -> Reset max/mand anterior teeth

Bonus: Sibilant sound (pg 56)