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32 Cards in this Set
- Front
- Back
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Occlusion is the interaction of the __________ structures
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stomatognathic
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what are the stomatognathic structures?
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mouth, jaws, and closely associated structures
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what is Gnathology?
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the science that treats the biology of the masticatory mechanism as a whole (morphology, anatomy, histology, physiology, pathology)
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what is the masticatory system made up of?
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bones, muscles, ligaments, and teeth and nervous system
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what are the 3 muscles of mastication?
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1- Elevators
2- Protruders 3- Retruders |
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what are the 3 controlling mechanisms of Occlusion?
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1- Neuromuscular system
2- right and left temporomandibular joints 3- contacting surfaces of the teeth |
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what are the muscles of elevation?
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Temporalis
Masseter Medial Pterygoid |
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what muscle is a protruded?
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Lateral Pterygoid. (the condyle moves forward which will move the jaw back)
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what are the 4 supra hyoids?
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geniohyoid
mylohyoid digastric stylohyoid |
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what do the suprahoids function to do?
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elevate hyoid bone
depress mandible when hyoid bone is fixed |
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what are the Infrahyoids?
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1- Thyrohyoid
2- Sternohyoid 3- Sternothyroid 4- Omohyoid |
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what is the function of the infra hyoids?
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lower hyoid bone and larynx steady hyoid bone
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so during normal closure, the elevator pull the jaw up and what will relax?
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the suprahyoids
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were does the mandibular nerve have motor innervation to?
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temporalis
masseter medial pterygoid lateral pterrygoid |
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Classification of Malocclusion:
Class 1= Class 2= Class 3= |
1= Neutroclusion
2= Distoclusion 3= Mesioclusion (we are referring things to the mandible. So in distoclusion, the mandible is more distal than it should be in Neutroclusion) |
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what is centric Occlusion (CO)?
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the position of the mandible when there is maximum planned contact and or/intercuspation
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what is Gypsum?
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it is calcium sulfate dihydrate
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there are 3 types of the mineral calcium sulfate...
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1- Andhydrite (Anhydrate)
2- Bassanite (Hemihydrate (half a water)) 3 Gpysum (dihydrate) All three can be converted to one another by either adding heat or by adding water. |
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the US is the largest producer of Gypsum, the primary _______ source of calcium sulfate
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natural
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Gypsum is very soft material and can be ground to a powder and calcined to remove most of the ________.
what is then added to the powder to form a plastic mass that can be molded? the mass will then harden and will be restored to it's original shape. |
water.
water |
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Gypsum is about what percent weight by water?
and volume by water? |
21%
50% |
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when the water dries in the gypsum of the mold, what do we get?
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water of crystallization
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what happens at boiling point, 100 degrees C?
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there's no crystalline reaction
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Gypsum has immense commercial value. Like what?
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construction
Agriculture Food medical chalk cosmetics beer dental |
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is Gypsum the most commonly used material in dentistry?
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yes!
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what do we use Gypsum for?
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Dental casts and Dental Dies
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what is a dental die?
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it is like 1 tooth.
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so it looks like dental dies are used to fabricate outside of the patients mouth. what is this called?
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indirect restorations
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Gypsum is also found in toothpaste
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yes
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what are the 3 most important types of relatively pure gypsum in dentistry?
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1- model plaster (white)
2- Dental Stone (Yellow) 3- High strength dental stone (green at CU) All three types have identical chemical formulas (Calcium sulfate hemihydrate) The thing that's different is that they have different physical properties. There's no "all-purpose" gypsum products. |
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5 types of classification of dental paster and stone...
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1- Plaster, Impression
2- Plaster, Model 3- Dental Stone 4- Dental Stone, high strength 5-Dental Stone, high strength, high expansion |
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what is Calcining?
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Applying heat to form hemihydrate.
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