Lecture 7 - Art & History of Articulators & Teeth Flashcards
2 types of suspension elements?
- noncondylar axis
2. postional
Type of condylar elements?
- mobile
2. adjustable
type of semi-adjustable condylar elements?
- arcon - anatomically correct
2. non-arcon - oppos of arcon
What are the factors of Hanau’s quint?
condylar guidance, incisal guidance, plane of occlusion, compensating curve, cuspal inclination
Thiedleman’s formula?
(condylar guidance x incisal guidance)/ (plane of occlusion x compensating curve x cuspal inclination)
What are the modern articulator classifications?
- simple hinged
- fixed condyle
- semi-adjustable
- fossa-molded
- fully adjustable
First articulator was made in 1804 by…? What particular element did it utilize?
Gariot’s. (Plane line) First articulator had hinged elements. It used one thumb screw to determine the U/L dimension of the device and to measure the vertical dimension of the patient.
What are articulator(s) that use the mobile condylar element?
Bonwill’s articulator, so it did hinge movt AND some translation w/ springs.
Bonwill triangle was how many inches per side?
4 inches on each side of equilateral triangle.
Bonwill determined what about teeth occlusion?
He determined that the overbite/underbite in proportion (occlusion) determined the length of the cusps. (teeth will erupt until they contact opposing teeth)
T/F When you have a balanced occlusion and chew from side to side, posterior teeth will be out of contact.
False, they will still be in contact in a balanced occlusion.
What is articulator(s) that use the adjustable condylar element?
Luce’s “OGEE” curvature
Walker’s articulator - had to use facial clinometer (that crazy ass Saw-movie like torture device..)
Who decided that the facial clinometer was irrational?
Christensen made a “rational” articulator, which used a protrusive record to change the condylar angle.
Who subscribed to the theory that condyles had no effect on suspension of the mandible and instead had a spherical theory?
Monson. Monson’s sphere is still used today to establish occlusal plane if you have no other intraoral reference to make prosthodontics/dentures.
Who subscribed to the theory that condyles had no effect on suspension of the mandible and instead had a conical theory?
Hall (Hall’s conical theory). He believed that it was in line from occipital to frontal bone.
Who used the positional type of suspension element?
Gysi’s Simplex Articulator
Gysi’s Adjustable Articulator
Stansbery’s Tripod
What did Gysi’s arrow point tracing to?
Helped define the border movts of mandible (like Posselt’s diagram)
Tell me about Stansbery’s tripod?
Each leg had a universal joint that can be moved around independently. Had to match up to R/L lateral protrusion.
What where the early tooth replacement locations/time frames that Monsieur Wicks gave us?
Ancient Egypt
Middle Ages Europe
Colonial America
Tell me about Gysi’s Simplex Articulator?
- early arcon articulator
- condyles on the lower member
- condylar guidance set at 30 degrees
- incisal guidance set at 60 degrees
Tell me about Gysi’s Shark Tooth Occlusal Pathways?
- articulator condyles set to 20, 30, 40 degrees
- metal shark’s teeth mounted against plaster block
- tooth surfaces cut out by masticatory movts
- still used today
- first made an anatomicporcelain tooth 33 degrees designed to function harmoniously w/ incisal and condylar guidance
Tell me about Gysi’s Adjustable Articulator?
- 1st to use side shift adjustment and incisal guide table
- arcon instrument
Tell me about semi-adjustable articulators?
early articulators were capable of accepting a facebow transfer, centric & eccentric records
- examples: Hanua Model H & GysiTrubyte
What is the most widely used and manufactured articulator?
Hanau’s model
