Part III Study Guide Flashcards
Ways to determine Vertical dimension
Pre tx records
Physiologic rest
Phonetics
Ceph
Closing force
Esthetics
Tactile
Swallowing
Wear
Interocclusal rest space average
2-4mm
Closest speaking space averages
Class I: 1.5-3mm
Class II: 3-6mm
Class III: 1mm
Who determined correct incisal edge position
Vig, Frush&Fisher
Who talked about F
Pound - hit wet/dry line
What info do you get from provisionals (3)
Incisal edge length
incisal palatal contours
vertical dimension
what is golden proportion
Who spoke about it
It is a repeated ratio that had its origins in ancient Greece and produced esthetically pleasing architecture due to the repetition of the 1:1.618 proportion.
LOMBARDI
Why did you choose articulator
It’s an arcon semiadjustable articulator so it accepts a facebow and allows me to program the condylar inclination and immediate mandibular lateral translation. This information allowed me to develop anterior guidance with mutually protected occlusion
What is an arcon semiadjustable articulator
Arcon refers to an articulator containing the condylar path elements in the upper member and the condylar elements on the lower member. A semiadjustable articulator has condylar pathways simulated by averages and accepts a facebow
How is an arcon different than a nonarcon articulator
An arcon has the condylar element on the lower member and a nonarcon has the condylar element on the upper member. With an arcon articulator the condylar inclincation remains in the same relationship the occlusal plane when opening or closing the pin.
Why did you not use a fully adjustable articulator?
I didn’t feel it was necessary because we know that condylar movements are similar except for their immediate lateral translation and their condylar inclination. Averages are built into the articulator for the curvature of the condylar eminence and the progressive lateral translation.
Who first talked about canine guidance
Damico
What difference would there have been if you used a fully adjustable articulator?
Given the occlusal scheme that I established, there would not have been a clinically significant difference. Intercondylar distance, and progressive side shift would have been measured which has the potential to effect groove placement and the inner aspect of cusp anatomy if my patient did not fall within the averages that Stratos
Why did you take a Cadiax
To get my posterior detereminants
Why do you need this information? Cadiax
To minimize adjustment, to preserve anatomic detail, to minimize potential for interferences and to develop posterior disclusion.
How do you know that the Cadiax works
Original research on this was by Slavicec and more recent research supporting its reliability include a paper by Chang/Driscoll.
Hanau Quint
Condylar Inclination
Plane of occlusion
Cuspal height
Compensating curve
incisal guidance
Theilmanns’s Formula
(CG x IG)/(CCxCHxOP) = 1
progressive disclusion
Gnathological concept where you begin your waxing from the posterior and each tooth must barely disclude the tooth posterior to it in lateral excursions so that if you lose your canine guidance, you still have an anteriorly directed disclusion pattern.
What does the facebow accomplish?
It orients the maxillary teeth to the terminal hinge axis
What was your third point of reference?
I used a nasion relator which puts the facebow in close relation to orbitale.
What is the Frankfurt Horizontal Plane?
Lowest point on orbit to Highest point on external auditory meatus (Porion to orbitale)
Normal range of jaw movements
Hinge
Max opening
Latero/protrusive
20mm
40-60mm
8-10mm
What is TMD
TMD is abnormal, incomplete or impaired function of the TMJ
Define CR
a maxillomandibular relationship, independent of tooth contact, in which the condyles articulate in the anterior-superior position against the
posterior slopes of the articular eminences; in this position, the
mandible is restricted to a purely rotary movement; from this unstrained, physiologic, maxillomandibular relationship, the patient can make vertical, lateral or protrusive movements; it is a clinically
useful, repeatable reference position
Bennett Angle
The angle formed between the sagittal plane and the average path of the advancing condyle as viewed in the horizontal plane during lateral movements.
9 factors for ideal tooth preparation
1 TOC should be 10-20˚ Both
2 OC/IC dimension-3mm minimum(incisors and PM) 4mm molars Resistance
3 Ratio of OC/IC dimension to faciolingual dimension (.4 or more) Resistance
4 Circumferential morphology(need corners) Resistance
5 Finish line location Both
6 Finish line form Fit
7 Axial and Incisal /Occlusal reduction depth Esthetics
8 Line angle forms Strength
9 Surface texture Fit
3 most important things for retention and resistance
- TOC
- Ratio of OC/IC to B-L dimension
- OC/IC dimension
No retention, what should you do?
- Decrease TOC
- Proximal boxes
Define resistance
The features of a tooth preparation that resist mediolateral forces