DETERMINANTS OF OCCLUSAL MORPHOLOGY PART II Flashcards
What is the definition of horizontal factors?
THEY INFLUENCE THE DIRECTION OF THE RIDGES AND GROOVES ON THE OCCLUSAL SURFACES, AND ALSO THE PLACEMENT OF THE CUSPS.
What is mediotrusion?
- mandible moves medially
- right mediotrusion means that the right condyle moves medially
- the non-working pathway is called mediotrusive pathways
What is laterotrusion?
- mandible moves laterally
- right laterotrusion means that the right condyle moves laterally
- the working pathways are called laterotrusive pathways
What are the horizontal factors?
- distance from the rotating condyle
- distance form the midsagittal plane
- amount of mandibular lateral translation
- intercondylar width
The greater the distance of the tooth from the rotating condyle, the _______ the angle formed by the working and non-working pathways
wider
The angle formed by the working and non-working pathways increases as the intercondylar distance _______
INCREASES
What controls the rhythmic separation and closure of the teeth (mastication) is controlled by…
central pattern generator
AVERAGE MAX BITING FORCE…
80 TO 150 LBS
What is the definition of swallowing?
“SERIES OF COORDINATED MUSCULAR CONTRACTIONS THAT MOVE A BOLUS OF FOOD FROM THE ORAL CAVITY THROUGH THE ESOPHAGUS TO THE STOMACH”
What is the first stage of swallowing?
- VOLUNTARY CONTROL
- BOLUS OF FOOD IS CREATED
- LIPS ARE SEALED
- TIP RESTS AGAINST HARD PALATE BEHIND INCISORS
- TEETH CONTACT IN MIP
- REFLEX REACTION IN TONGUE PUSHES FOOD POSTERIORLY
INTO PHARYNX
What is the secondary stage of swallowing?
- FOOD BOLUS IN PHARYNX
- CONTRACTION OF PHARYNGEAL CONSTRICTOR MUSCLES MOVE FOOD TO ESOPHAGUS (PERSTALSIS)
- SOFT PALATE RISES AND SEALS OFF THE NASAL PASSAGES
(NASOPHARYNX) = VELOPHARYNGEAL SEAL - EPIGLOTTIS SEALS OFF TRACHEA
What is the third stage of swallowing?
- PERISTALTIC WAVES MOVE FOOD INTO THE STOMACH (6-7 SECONDS)
- CARDIAC SPHINCTER RELAXES AND FOOD ENTERS STOMACH
Do teeth contact during speech?
NO!
