Exam 1 Flashcards
(103 cards)
1
Q
5 ideal features of PRELIMINARY impression tray:
A
- Rigidity
- Ability to be sterilized OR disposable
- Compatible with impression material
- Easily modified
- Smooth for comfort/protection of oral tissues
(“RACES”)
2
Q
An edentulous stock tray should be _____ mm larger than the outside surface of the residual ridge.
A
4-5 mm
3
Q
3 advantages of irreversible hydrocolloid impression:
A
- Low $$$
- Hydrophilic (Water <3)
- Setting time/viscosity modifiable w/o affecting properties of material adversely
4
Q
2 disadvantages of irreversible hydrocolloid impression:
A
- lack of surface detail
2. poor dimensional stability (syneresis/imbibition)
5
Q
Wax rim measurements:
A
Maxillary rim height: 22 mm
Mandibular rim height: 18 mm
Anterior: 6 mm wide at midline
Posterior both 8 mm wide, centered over crest of ridge
6
Q
The anterior incisal position of the mx wax rim should be _______ mm from the center of the incisive papilla measured in a horizontal plane.
A
8-10 mm
7
Q
Camper’s PLANE extends between…
A
the acanthion (tip of ant. nasal spine) to the center of BOTH external auditory meatuses.
8
Q
Camper’s LINE (aka “Ala-tragus Line”) extends between…
A
the inferior border of the ala of the nose to the tip of the tragus on the ear.
9
Q
Frankfort Horizontal Plane extends between…
A
the inferior border of the orbit (orbitale) to the superior point of the external auditory meatuses.
10
Q
Camper’s Line (ala-tragus line) is ____ degrees under the Frankfort Horizontal Plane.
A
10 degrees
11
Q
T/F: The ala-tragus line (Camper’s line) is PARALLEL to the Frankfort Horizontal.
A
FALSE
12
Q
T/F: The anterior radiological landmark for Camper’s plane is the orbitale.
A
FALSE
13
Q
The anterior reference point for Camper’s plane is __________ to the anterior reference point for the Frankfort Horizontal.
A
inferior
14
Q
Ideal temperature for the water bath used in border molding:
A
140 degrees F
15
Q
Bennett angle for our articulators:
A
15 degrees
16
Q
The change in edentulous residual ridges leading to “outward position of mandible and inward position of maxilla”:
A
prognathic (protruding mandible)
17
Q
Distal end of mx denture at posterior should end _____ mm anterior to fovea palatinae.
A
1-2 mm
18
Q
The labial surface of mx wax rim should be finished as:
A
flat
19
Q
The tendon of this muscle helps ensure the retro-molar pad is a primary stress bearing area for the mn complete denture:
A
temporalis
20
Q
Resistance to vertical movement of a denture base TOWARDS the ridge:
A
support
21
Q
resistance to displacement of denture base AWAY from ridge:
A
Retention
22
Q
Resistance to horizontal or rotational forces:
A
stability
23
Q
4 materials used for border molding:
A
- Polyether
- Soft Liners (plasticized acrylics)
- Green Stick Compound
- PVS heavy body (High viscosity PVS)
24
Q
Consequences of tooth loss:
A
- Residual Ridge Resorption
- Changes in intra-oral structures
- Decreased masticatory function
- Loss of facial support and muscle tonus
- Psycho-social effects
25
3 edentulous impression techniques:
1. selective pressure
2. mucostatic
3. functional ("walking")
26
The "mucostatic" denture impression technique is:
low pressure
27
Which edentulous impression technique is a "closed mouth" one?
functional
28
When the soft palate is almost COINCIDENT with the vibrating line, which class?
Class III
29
When the soft palate is FURTHEST from the vibrating line, which class?
Class I
30
How long should you wait for PVS adhesive to set in the custom tray before making the impression?
10 minutes
31
4 purposes of the record bases with wax rims:
1. establish level/height of occlusal plane
2. establish neutral zone/arch form
3. establish VDO
4. preliminary CR record
32
2 foods used to evaluate mastication efficiency:
carrots and peanuts wtf lol
33
2 primary components forming the matrix of SET Triad denture base resin:
1. urethane dimethacrylate
| 2. acrylic resin beads
34
3 features of the acrylic resin beads in set Triad denture base resin:
1. ease to trim with burs
2. retention to PVS
3. can repair/add more
35
What 2 muscles move anteriorly that may lead a pt with over-extended dentures to complain about pain when swallowing?
superior constrictor and palatoglossus
36
2 bones of skull an upper complete denture directly res upon the overlaying mucoa:
palatine process of maxilla
and
horizontal plates of palatine bone (???)
37
the mylohyoid muscle fibers run to the tongue horizontally in the:
anterior
38
The Whipmix earbow uses what anterior reference?
nasion
39
Maximal masticatory forces for natural dentition is 200 N and for dentures is:
60-80 N
40
complete denture wearers only generate approximately ___ % of the bite force generated by dentate individuals.
20%
41
Maximal bite force is ___x less for complete denture wearers than for persons with natural teeth.
6x less
42
2 rigid edentulous final impression materials used in mucostatic impression:
1. ZOE (metallic oxide paste)
| 2. Plaster (impression type)
43
Mastication can change with age becasue muscle tone can decrease by upwards of ___ % between middle and old age
50%
44
Term for ability of people to identify 3D shapes in the mouth.
oral stereognosis
45
Ratio of women to men for systemic lupus erythematosus:
10:1
46
T/F: A class III residual ridge morphology has a radiographic height of 11-15 mm measured at the least vertical height of the mandible.
True
47
T/F: The Fox Occlusal PLane is used to mimic the plane of the upper member of your articulator.
FALSE (Fox Occlusal Plane is an instrument, NOT an anatomic landmark)
48
Actual chewing time per meal in sec:
450 seconds
49
As a consequence of tooth loss, residual ridge resorption causes the mandible to become shorter and ...
wider.
50
Eight muscles meet at the corner of the mouth at:
Modiolus
51
Disinfectant used for alginate impressions:
Cavicide
52
Histologically, oral tissues are allowed for keratinization to increase if complete dentures are not worn for:
6-8 hours
53
As presented in lecture, the study of masticatory performance of a dentate group at an average of 90% demonstrated less performance by denture wearers at an average rate of only __ %.
60%
54
Sjogren's Syndrome has a peak incidence between ___ years of age
40-50 yoa
55
The top portion of your Hanau articulator that the max magnetic mounting plate screw down on represents which horizontal plane?
Frankfort
56
4 materials used for record bases:
1. Hard baseplate wax
2. Light-polymerized resin
3. Auto-polymerizing acrylic resin
4. Heat-processed acrylic resin
57
Name of "green" wax used for CRR?
Aluwax
58
Deglutition occurs about ____ x per day
500-600 x per day
59
The purpose of a facebow/earbow is to orient the mx cast to the ______ hinge axis of the articulator.
transverse
60
Tooth contacts during swallowing are usually of ______ duration compared to those occurring during chewing.
longer
61
Shaping of the border areas of an impression material by functional or manual manipulation of the soft tissue adjacent is...
border molding
62
The distobuccal border of the buccal vestibule is primarily influenced by the _______ (muscle).
masseter
63
Buccal retention of the mandibular denture base in the posterior has some depression for ___________ and __________.
buccinator muscle and buccal fat pad
64
The distal portion of the occlusal table bilateral is bounded by what anatomic structure?
Pterygomandibular raphe
65
What is a denture?
an artificial substitute for missing natural teeth and adjacent tissues
66
Definition of Complete Denture Prosthodontics
Knowledge and skills pertaining to the restoration of the edentulous arch with a removable dental prosthesis.
67
Complete denture aka...
Complete removable dental prosthesis
68
Complete dentures are:
1. full mouth rehab
2. reversible treatment
3. inexpensive treatment
4. can be used along with implant restoration
69
Residual Ridge Resorption: tension causes...
bone apposition/deposition
70
RRR: compression causes...
bone resorption
71
Mandibular RRR is ____x faster than maxially RRR
4x
72
RRR: Mandibular ridge becomes _____ and _______
shorter and wider
73
RRR: Maxillary ridge becomes ______ and ______
shorter and narrower
74
Masticatory performance:
complete dentures = __%
natural dentition = ___%
complete dentures = 60%
| natural dentition = 90%
75
Which structure of the mandible is a primary support area AND a landmark which does NOT move?
retromolar pad
76
anatomic landmark distal to the junction of hard and soft palate near the fovea palatine
vibrating line
77
How long should an edentulous pt NOT wear their dentures before getting a final impression of their ridges?
24 hours
78
Why should an edent. pt NOT wear their denture for 24 hours prior to getting a final impression?
microscopic inflammation
79
Which impression technique do we use to make custom trays?
selective pressure impression technique
80
2 purposes of border molding (aka muscle trimming):
1. establish accurate flange length and border thickness
| 2. achieve retention through border seal
81
Diagnostic casts should be at least ____ mm thick, extend ___ mm minimally from the vestibule, and have a land area with minimum ____ mm width.
10 mm thick
2-3 mm vertically from the vestibule
3-5 mm land area width
82
purpose of record bases + wax rims:
1. establish occlusal plane
2. establish neutral zone / arch form
3. preliminary CR and VDO maxillomandibular relation records
83
Maxillary lip support: nasolabial angle should be _____ degrees
90-100 degrees
84
phonetics of fricatives
fricatives = /f/ and /v/ "fifty-five"
85
Anterior Plane landmarks:
1. inter-pupillary line
| 2. lip line
86
Posterior Plane landmarks:
1. 1/2-2/3 of retromolar pad height at the mn 1st molar area
2. half of inter-arch distance
3. Camper's Plane
87
Distance measured between two points when teeth are in contact, determined by dentist for an edentulous pt, a physiologic range
VDO
88
How do you determine VDO?
1. Mechanical = measurement of existing dentures + accurate radiograph records
2. Functional = Physiologic rest position, phonetics, biting force, swallowing threshold, biting force can be measured using a Boos Bimeter
89
Position when the head is upright and all muscles are in equilibrium/tonic contraction and condyles are neutral and unstrained
Vertical dimension of rest (VDR)
90
VDO =
VDR - interocclusal rest space (aka freeway space)
91
VDR is always ____ mm greater than VDO
2-3 mm
92
name for space between the mx and mn posterior teeth when patient says "s"
Speaking Space
93
How do you adjust when VDO is too high?
lower the Mandibular wax rim
94
Symptoms of excessive VDO:
```
"GET CDC"
Generalized soreness
Elongated face
TMJ/muscle soreness
Can't open wide for food
Difficulty swallowing
Clicking of teeth when speaking
```
95
Symptoms of insufficient VDO:
```
"A RAID"
Angular cheilitis
Reduced lower face height
Angry facies, frowning
Inadequate space for post, denture teeth
Deep nasolabial folds
```
96
Primary requirements of good CR record:
1. record correct horizontal relation of mn to mx
2. exert equalized vertical pressure
3. retain record in undistorted condition until casts are accurately mounted
97
Accuracy of CR:
1. interocclusal bite registration on record rims (71% accurate)
2. intraoral gothic tracing (86.5%)
3. interocclusal wax record w/ all upper and 6 lower anterior teeth (96%)
Do VDO FIRST, then CR!!!
98
bitter tasting elastomeric impression material
polyether
99
smelly elastomeric impression material
polysulfide
100
How to get good impression:
1. use accurate custom tray
2. impress only healthy, "rested" tissue
3. make sure impression method matched the circumstances
101
Hanau's Quint:
1. incisal guidance
2. condylar guidance
3. cusp height
4. occlusal plane
5. compensating curve
102
Total time teeth are subjected to functional forces of mastication and deglutition during a day.
10-20 minutes
103
Risk Factors for Candidiasis:
1. Xerostomia
2. Broad spectrum antibiotic use
(3. steroid inhaler use) not in textbook, but true
4. denture wearing
5. high-carb diet
6. smoking tobacco
