Occlusion in Fixed Prosth Pt. I Flashcards Preview

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Flashcards in Occlusion in Fixed Prosth Pt. I Deck (42)
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1

Variable Factorsof Occlusion
—PLANE OF OCCLUSION:
—Imaginary plane containing the incisal edges of the ____ and the distobuccal cusps of the ____
—The teeth are never straight along the line; there is always a curve to follow (thecurve of Spee)
—Generally the plane isatdifferent ____ relative to the floor

mandibular canines
mandibular second molars
angles

2

Variable Factorsof Occlusion
—CURVE OF SPEE:
—Describes how great or little the curve actually is
—It goes from the cusp tip of the ____ through the cusp tips of all the ____h on the sameside
—Acompilation ofindividual planes of occlusion of individual teeth

mandibular canine
mandinular posterior teeth

3

Variable Factorsof Occlusion
—CURVE OF WILSON: —Connects the cusp tips of the
molars ina ____plane
—This changes from the first to the ____ molars
—There is change in the curve of Wilson with ____r of the dentition. In unworn dentition it is ____ from above. It becomes ____ with wear of the dentition or it can be ____ when the buccal cusps are longer than the palatal cusps.

frontal
third
wear
concave
flatter
convex

4

Variable Factors of Occlusion
— INCISALGUIDANCE
a)OVERBITE: Measured from ____ of maxillary incisors to ____ of mandibular incisors

incisal edge
incisal edge

5

Variable Factors of Occlusion
— INCISAL GUIDANCE
b) OVERJET: Measured from ____ of maxillary incisors along the horizontal plane to ____ of mandibular incisors.

incisal edge
facial surface

6

Variable Factors of Occlusion
—INCISAL GUIDANCE
c) FUNCTIONAL OVERJET: Measured from ____sof mandibular incisors to ____ of maxillary incisors.

FOA's
guiding inclines

7

Variable Factors of Occlusion
—EFFECTIVE ANTERIOR GUIDANCE:
—Defined as immediate disarticulation of ____ teeth by anterior teeth on movement into mandibular ____
—Generally for this to be able to occur, the functional overjet for the anterior teeth must be at or near ____

posterior
excursions
zero

8

Role of Anterior Teeth
—In a normal occlusal relationship the maxillary and mandibular ____ contact during ____ movements.

canines
lateral

9

Static Occlusal Contacts
—Tooth to tooth vs. tooth to two teeth —
Helps to distribute ____ evenly —Helps to maintain ____
—Angle classifications

force
arch integrity

10

Angle Classifications

• We are looking at both anterior and posterior rela5ve to classifica5ons

• Class 1 in anterior (right) but not class 1 on the lec side
• Class 2 division 1 – ____
• Class 2 division 2 – maxillary central is ____ in a lingual version
• Class 3 – ____ or class 3 in cross bite. No ____ in either of these
• Finally, you can have pa5ent with Anterior open bite – caused by late ____

deep bite
tipped
edge to edge
incisal guidance
thumb sucking

11

• Z – centric holding. This is important to hold the ____. If the pa5ent has too light of an
occlusion/centric holding, then we change their ____.

occlusion
occlusion
posterior support

12

Class II Div I

• Mandible is retronas5c, or the maxilla is ____
• This can be corrected with ortho or orthonac5c surgery
• The rela5onship is off by 1⁄4 - 1⁄2 a tooth
• Here we don’t have effec5ve ____ guidance

prognathic
incisal

13

Class III

• We see a ____ mandible & a ____ maxilla
• The MB cusp of first maxillary molar is behind the buccal groove of the
first mandibular molar

protrusive
retrognathic

14

Dynamic Occlusal Contacts
—Any movement of the mandible from the centric occlusion position that results in tooth contact is termed ____.
—There are three basic eccentric movements
____
____
____

eccentric
protrusive
laterotrusive
retrusive

15

patient doing a canine guided occlusion. looking posteriorly, we see the posterior teeth ____

disarticulate

16

pa5ent guiding in protrusive movement. All ____ teeth disar5culate. This is a protected occlusion. They are not picking up occlusion on posterior teeth. This is what we want in ____ pa5ents. Not the case in dentures cases. We will learn more in later courses

posterior
dentate

17

Contacts vs. Interferences

—Contacts: The patient has no ____ associated with the occlusion. The occlusion is either ____ or ____.
—Interferences: The patient has ____ associated with the occlusion.

pathology
ideal
physiologic
pathology

18

Protrusive
—The mandible moves ____ from the ____ position.
—The predominant protrusive contact occurs between the ____ teeth.

forward
centric occlusion
maxillary and mandibular anterior

19

Protrusive
• What contacts is the ____ of maxillary against ____ of mandibular teeth
• We don’t want ____ teeth to touch. We want them to disar5culate!

distal inclines
mesial inclines

20

Laterotrusive (Working)

—Most function occurs on the ____ (lateral movement) the side to which the mandible is shifted.

—Working contacts and cross-tooth contacts occur on the ____.

—Working contacts occur between the ____ of maxillary buccal (guiding) cusps and the ____ of the mandibular buccal (supporting) cusps.

—Cross-tooth contacts occur between the outer inclines of the maxillary supporting cusps____ and the ____ of the mandibular lingual cusps (non- supporting).

working side
working side
inner inclines
outer inlcines (FOA's)
FOA's
inner inclines

21

Laterotrusive

We look from ____ plane
• Working movement on one side (points to right side)
• On opposite side we have a non-working side (points to lec side)
• We have ____ contact on non working side and
____ on working side

mediotrusive
laterotrusive

22

Working Interference

Happens when we have a posterior tooth that is contac5ng when we guide on the working side, but not the ____

When do you think we will have issues with working interferences? – a pa5ent with normal maximum intercuspa5on might get working interference when we give a new ____, and when we check the bite the pa5ent says feels comfortable
But when pa5ent ____ they complain that it feels weird. When you put the paper in, you may find that the provisional was too bulky on inner incline so now when it guides you created a working interference
The working interference has to be adjusted for because it adds lateral forces, discomfort, and pain to pa5en

canine
crown
chews

23

CrossTooth Contact/
Interference

• We are guiding on working side. If its possible, the ____ cusps contact.
• Contact between ____ of mandible lingual non suppor5ng cusps (points to
green dots)against maxillary ____ area (points to green dots)
• Many 5mes ini5ally you have cross tooth interferences when you do ____ for a provisional. This is because the cusps are too bulky. It is something you will check for.

lingual
inclines
FOAs
block carving

24

Mediotrusive (Non-working)
—Formerly balancing contacts, but now the teeth disclude.
—Potential sites of contact on the ____ of maxillary lingual and mandibular buccal cusps.
—Mediotrusive contacts are ____.

inner inclines
interferences

25

Non-working Interference

• Common on ____ in pa5ents. Pa5ents will complain of pain.
• What is another situa5on where you can have non working interference in the mouth? – When
suppor5ng cusps are out of alignment like if the pa5ent had an ____ tooth. So you end up with loss of a tooth & loss of ideal occlusion.
• Is this easy to fix? – simply grinding away at the marks is not a long term solu5on. The teeth will shic back together and non working interference will return. So you leave the cusps in contact but you leave a ____ so that it slides through. But you don’t loose the ____ by grinding down
the suppor5ng cusps

third molars
extruded
channel
VDO

26

Working, Cross tooth, Non-working

Take a look at all

yay!

27

Retrusive

• Have the pa5ent move ____
• Maxillary ____ and mandibular ____ contactv

back
medial inclines
distal inclines

28

History
—Bilateral Balanced Occlusion
—Based on theories related to ____
—Became apparent these principles did not apply to ____
—Resulted in ____, mobile teeth and gingival clefting

dentures
fixed prosthodontics
premature wear

29

Unilateral Balanced Occlusion

—Group Function
—Earlier rehabs were modified by eliminating ____
—Led to the functionally generated path or ____ technique
—Importance of ____ guidance discovered and incorporated into the occlusal scheme

balancing contacts
"wax chew-in"
incisal guidance

30

Group Function

—Based on the philosophy that the more teeth to share the load the better
____ guidance established first
—Spreads working side contact over ____ or more teeth in
each arch
—These teeth should be adjacent to each other —Involves ____ cusps only

canine/incisal
3
buccal