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PROSTHO > Lec 2 > Flashcards

Lec 2 Flashcards

1
Q

also called as alginate

A

IRREVERSIBLE HYDROCOLLOID

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2
Q

→ preferred impression material in creating diagnostic casts
→ are essentially sodium or potassium salts of alginic acid and are
therefore water-soluble

A

IRREVERSIBLE HYDROCOLLOID

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3
Q

True or false

because irreversible hydrocolloid is largely water, it readily
absorbs (by inhibition) as well as gives off (by syneresis) liquid
to the atmosphere, causing distortion of the impression

A

True

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4
Q

True or false

Alginate impression is the negative copy of the oral cavity. Mixing time is measured from the beginning of integration of alginate with water until consolidation stage.

A

True

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5
Q

→ impression trays
→ modeling compound
→ mixing bowl
→ mixing spatula
→ gauze squares
→ irreversible hydrocolloid
→ American Dental Association (ADA) type IV or V stone
→ vacuum mixer
→ humidor
→ disinfectant

A

DIAGNOSTIC IMPRESSION TECHNIQUE

(ARMAMENTARIUM)

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6
Q

True or false

In TRAY SELECTION, tray selection should have a clearance of 1⁄8 inch

A

True

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7
Q

True or false

→ in reaching an important area in the palate, impression trays
are modified by extending the border with wax or modeling
compounds
→ plastic trays do not retain alginate as well as the metal trays

A

True

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8
Q

True or false

IMPRESSION MAKING

→ material is mixed to a homogeneous consistency and loaded into the tray, and its surface is smoothed with a moistened gloved finger

→ for optimum results, the teeth should be cleaned and the mouth thoroughly rinsed; some drying is necessary, but excessively dried tooth surfaces cause the irreversible hydrocolloid impression material to adhere

→ a slow gradual force is used in removing the impression taken using irreversible hydrocolloid

A

True

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9
Q

seemingly minor inaccuracies that can lead to serious diagnostic errors

A

EVALUATION

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10
Q

for an analysis, the diagnostic casts need to be attached to an articulator, a mechanical device that stimulates mandibular movement

A

ARTICULATOR SELECTION

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11
Q

True or false

A

articulators can simulate the movement of the condyles in their corresponding fossae; they are classified according to how closely they can reproduce mandibular border movements

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12
Q

their use often leads to restorations with occlusal discrepancies because these instruments do not have the capacity to reproduce the full range of mandibular movement

A

SMALL NON-ADJUSTABLE ARTICULATORS

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13
Q

practical approach to obtaining the necessary diagnostic information while minimizing the need for clinical adjustment during treatment

A

SEMI-ADJUSTABLE ARTICULATORS

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14
Q

has a wide range of positions and can be set to follow a patient’s border movements

A

FULLY ADJUSTABLE ARTICULATORS

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15
Q

→ this is useful when doing maxillofacial reconstructions
→ these are caliper-like devices used to record the anteroposterior
and mediolateral position of the maxillary occlusal surfaces

A

FACEBOWS

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16
Q

two types of facebows are recognized:

A

arbitrary and kinematic

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17
Q

True or false

the mandibular hinging movement around the transverse horizontal axis is repeatable

o facebows are used to record the anteroposterior and
mediolateral spatial position of the maxillary occlusal surfaces in relation to this transverse opening and closing axis of the patient’s mandible

o the facebow is then attached to the articulator to transfer the recorded relationship of the maxilla by ensuring that the corresponding cast is attached in the correct position in relation to the hinge axis of the instrument

A

True

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18
Q

less accurate; suffice for most routine dental procedures

A

Arbitrary Facebow

19
Q

indicated when it is crucial to precisely reproduce the exact opening and closing movements of the patient on the articulator

A

Kinematic Facebow

20
Q

HINGE AXIS RECORDING

KINEMATIC FACEBOW TRANSFER

A

KINEMATIC HINGE AXIS FACEBOW

21
Q

the clinician can determine the hinge axis of the mandible to within 1 mm by observing the movement of kinematic facebow styli positioned immediately lateral to the temporomandibular joint, close to the skin

A

HINGE AXIS RECORDING

22
Q

the kinematic facebow consists of (3) components: a transverse component and two adjustable side arms

A

HINGE AXIS RECORDING

23
Q

attached to the portion of the clutch that protrudes from the patient’s mouth

A

Transverse Rod

24
Q

attached to the transverse member and adjusted so that the styli are as close to the joint area as possible

A

Side Arms

25
Q

→ is time consuming and so, its use is generally limited to extensive prosthodontics, particularly when a change in the occlusal vertical dimension is to be made

→ a less precisely derived transfer would then lead to unacceptable errors and compromise the result

A

KINEMATIC FACEBOW TRANSFER

26
Q

ANTERIOR REFERENCE POINT

FACEBOW TRANSFER

CENTRIC RELATION RECORD

JAW MANIPULATION

ANTERIOR PROGRAMMING DEVICE

CENTRIC RELATION RECORDING TECHNIQUE

A

ARBITRARY HINGE AXIS FACEBOW

27
Q

→ approximate the horizontal transverse axis and rely on anatomic average values
→ manufacturers design these facebows so that the relationship to the true axis falls within an acceptable degree of error

A

ARBITRARY HINGE AXIS FACEBOW

28
Q

the use of an anterior reference point enables the clinician to duplicate the recorded position on the articulator at future appointments

A

ANTERIOR REFERENCE POINT

29
Q

an anterior reference point, such as the inner canthus of the eye or a freckle or mole on the skin, is selected

A

ANTERIOR REFERENCE POINT

30
Q

ARMAMENTARIUM
→ arbitrary hinge axis facebow
→ modeling compound
→ cotton rolls

A

FACEBOW TRANSFER

31
Q

→ provides the orientation of mandibular to maxillary teeth in CR in the terminal hinge position, in which opening and closing are purely rotational movements

A

CENTRIC RELATION RECORD

32
Q

centric relation is defined as the ________ relationship

A

maxillomandibular

33
Q

→ the condyles should remain in the same place throughout the opening-closing arc
→ trying to force the mandible backwards leads to downward translation of the condyles and restorations made to such a mandibular position are in supraclusion at the evaluation stage

A

JAW MANIPULATION

34
Q

→ in some patients in whom CR does not coincide with MI, resistance may be encountered when the mandible is hinged

→ the teeth can be kept apart with cotton rolls, a plastic leaf
gauge, or a small anterior programming device made of autopolymerizing acrylic resin (also known as a Lucia jig)

A

ANTERIOR PROGRAMMING DEVICE

35
Q

the choice of recording medium is, to some degree, a function of the casts to be articulated

A

CENTRIC RELATION RECORDING TECHNIQUE

36
Q

a malleable material for recording the CR position

A

REINFORCED ALUWAX RECORD

37
Q

measures only certain components of mandibular movement thought to be of greatest clinical significance

A

Simplified Pantograph

38
Q

fully adjustable articulators

A

Pantographic Recordings

39
Q

designed to record and measure functional and border movements

A

Electronic Pantograph

40
Q

cut or mold a three-dimensional recording of the jaw movements

A

Stereograms

41
Q

tooth contacts and by the shape of the left and right temporomandibular joints

A

Anterior Guidance

42
Q

to simulate protrusive guidance and they have lateral wings that can be adjusted to approximate lateral guidance

A

Mechanical Anterior Guide Table

43
Q

s used for accurately transferring to an articulator the contacts of anterior teeth

A

Custom Acrylic Anterior Guide Table

44
Q

with the advances in computer-aided design and computer-aided manufacturing (CAD/CAM), optical scanning of entire arches has become a fairly straightforward procedure

A

VIRTUAL ARTICULATORS

PROSTHO (17 decks)

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