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36 Cards in this Set
- Front
- Back
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Occlusion
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Static relationship between the incising or masticating surface of maxillary and mandibular teeth
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Articulation
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Contact relationship between occlusal surfaces of teeth during function
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Anatomic teeth
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Have cuspal inclinations greater than 0 and replicate natural tooth anatomy
Cuspformed teeth 30-45deg are considered anatomic teeth Modified occlusal form with 20 degree cusp incline or less. Sometimes called semi-anatomic teeth |
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Advantages & Disadvantages of Cusp form teeth
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-Penetrate food easily
-Resist movement of dentures -Minimized lateral component of chewing cycle - Better esthetics - Psychological advantage from "natural" appearance - Little tolerance in articulation - Require remount procedure for occlusal correction - Relining and rebasing denture with cusp form teeth is difficult |
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Balanced articulation
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Bilateral simultaneous anterior and posterior occlusal contact of teeth in centric and eccentric positions.
Occlusal contacts initially in maximum intercuspation, and their continuous contact during movements along specific working, balancing, and protrusive pathways |
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Monoplane articulation
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Teeth arranged in a single plane
- Occlusal contact initially in maximum intercuspation, and disocclusion of posterior teeth as a result of their arrangement in a single plane, and the contacts of anterior tooth during movements of mandible. |
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Lingualized articulation
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Occlusal contacts of maxillary lingual cusps of posterior teeth with occlusal surfaces and marginal ridges of mandibular teeth in maximum intercuspation.
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Advantage & Disadvantage of nonanatomic teeth
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-Does not lock mandible into one position
- Minimized horizontal pressures - Permit closure in more than one position - Occlusal corrections are easier to accomplish - Do not penetrate food easily - Improper food escape ways - Poor esthetics - Negative psychological effects |
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Mold numbering system for anteriors
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First number describes form of tooth such as square, square tapering, ovoid etc
Second number describes proportion of tooth Length to width. And whether labial surface is straight or curved from gingival to incisal Letter is width of six anteriors on the curve from canine to canine |
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Factors used to describe posterior tooth mold
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Manufacturer usually indicates:
- Cusp angles - Total width from mesial of first premolar to distal of second molar - Occlusal to cervical height - Proprietary mold designation - Material used to fabricate tooth - Shade. May or may not follow shade system for anteriors |
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Materaisl used in artificial tooth fabrication
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Porcelain
Acrylic resin Composite resins |
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Cusp height
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A 30deg
B 20deg C 0deg |
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Chronic bruxers & grinders
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Best served with monoplane occlusal schemes
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Molding methods
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- Compression molding
- Injection molding - Pouring fluid resin into a vented mold |
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Polymerization methods
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Conventional heat
Microwave Visible light activated Auto polymerization |
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Materials
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- Polymethyl methacrylate
- Vinyl polycarbonate - Urethane dimethacrylate - Flexible nylon, Cast metal & plastic combo |
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Compression molding advantage
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Compression molding of acrylic resin (Polymethyl methacrylate) using external heat application for polymerization is still the choice for absolute control and least cost
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Care at beginning of curing
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Excessive heat combined with exothermic nature of polymerization will result in porosity of acrylic
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Pressure indicating paste
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Zinc oxide paste
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Purpose of clinical remount
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Correct for fact that:
- Adjusted denture bases seat more accurately than record bases - Accommodate for errors made during the making of centric relation records |
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Factors controlled by the dentist
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Occlusal discrepancies
Poor denture base adaptation Inadequate denture extensions |
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Factors beyond control of dentist
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Moderate to severe resorption
Unfavorable floor of mouth posture Retruded tongue position Reduced salivary flow |
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Types of impressions
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Primary - anatomic record
Secondary - Anatomic and functional record |
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Impression materials
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-Modeling compound
-Irreversable hydrocolloid |
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Gypsum cast uses
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Diagnosis & Custom tray fabrication
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Custom tray materials
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Thermoplastic
Acrylic Light cured composites |
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Secondary impression materials
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- Metallic (Zinc) Oxide & Eugenol paste
- Plaster - Reversible hydrocolloid - Mouth temperature waxes - Polyvinylsiloxanes |
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Border molding materials
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Modeling compound
Wax Elastomers |
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Border molding sequence Maxillary
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Posterior - Opening and rotating jaw
Premolar area - Pucker and smile Anterior - Massage upper lip with lateral motion. Don't pull lip down Palatal seal - Add wax inside tray. Ask patient to swallow |
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Purpose of vent holes
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- Prevents air bubble entrapment
- Relieve hydrostatic pressure on median suture & incisive papilla - Permits proper seating of loaded tray |
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Border molding sequence mandibular
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Sides - Message cheek, pucker and smile
Retromolar pad - Have patient swallow to contract massetter Anterior - Pucker and smile Posterior - Patient push tongue against thumb placed in lower incisor area Posterior interior - Lick upper lip corner to corner & swallow |
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Denture against external oblique ridge and mylohyoid ridge
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Make sure denture border is overextended past oblique ridge
- Border molding of mylohyoid ridge should be 4-6mm below this ridge If not, a space can occur between denture and buccinator resulting in food accumulation |
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Denture placement sequence
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- Adjust denture base with PIP
- Adjust borders with disclosing wax - Remount in CR - Get protrusive record and place in articulator while locking the condylar guide plane - Equilibrate in lateral excursion - Patient education |
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Intervals of adjustment and inspection
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24hrs
72hrs 1wk PRN after 1wk 9months - 1yr post insertion |
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Common problems
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Mandibular - Discomfort, poor retention & stability, lack of support
Maxillary - Poor retention & Stability, gagging, Esthetics, phonetics |
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Permanent soft liners
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Silicone elastomers limited to mandibular dentures
- Used for chronic soreness, bruxers, no attached gingiva - Contraindicated in poor oral hygiene, pts with xerostomia |
