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PROSTHO > 16 A > Flashcards

16 A Flashcards

1
Q

the artificial teeth of a partial fixed dental prosthesis (FPD) that replace missing natural teeth, restoring function and appearance

A

PONTIC

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2
Q

incorporate mechanical principles for strength and longevity, as
well as esthetic principles

A

PONTIC

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3
Q

→ meets hygienic requirements and prevent irritation of the residual ridge
→ particular attention to form and shape of the gingival surface
→ facilitate plaque control
→ adjust to existing occlusal condition

A

PONTIC DESIGN

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4
Q

FDP is to prevent tilting or drifting of the adjacent teeth into the edentulous space

A

PONTIC SPACE

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5
Q

→ if orthodontic repositioning is not possible, contours of adjacent teeth may be better than making an FPD with undersized pontics
orthodontic repositioning is not possible, increasing proximal
→ careful diagnostic waxing procedures help determine the most appropriate treatment

A

PONTIC SPACE

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6
Q

ridge has a smooth, regular surface of attached gingiva which facilitates maintenance of a plaque-free environment

A

RESIDUAL RIDGE CONTOUR

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7
Q

its height and width should allow placement of a pontic that appears to emerge from the ridge and mimics the appearance of the neighboring teeth

A

RESIDUAL RIDGE CONTOUR

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8
Q

→ it must be free of frenum attachment and be of adequate facial height
→ design a pontic that meets hygienic requirements and prevents irritation of the residual ridge

A

RESIDUAL RIDGE CONTOUR

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9
Q

(“black triangles” → food impaction) and percolation of saliva during speech

A

RESIDUAL RIDGE CONTOUR

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10
Q

→ resorption occurs at the buccal plate resulting horizontal defect
→ 0.3 to 5 mm at 6 months after extraction

A

GINGIVAL ARCHITECTURE PRESERVATION

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11
Q

→ 50% of the width of alveolar ridge is lost at 12 months
→ the alveolar process can be preserved through immediate
restorative and periodontal intervention at the time of tooth
removal

A

GINGIVAL ARCHITECTURE PRESERVATION

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12
Q

by conditioning the extraction site and providing a matrix for
healing

A

GINGIVAL ARCHITECTURE PRESERVATION

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13
Q

→ preserving the facial plate of bone; if bone levels are compromised before or during extraction, the sockets can be grafted with an allograft material (hydroxyapatite, tricalcium phosphate, or freeze-dried bone)
→ immediately after preparation of the extraction site, a carefully shaped interim FDP is placed
→ orthodontic extrusion and root submergence

A

GINGIVAL ARCHITECTURE PRESERVATION

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14
Q

soft tissue procedure

→ Siebert classified residual ridge deformities into three
categories:

A

SURGICAL MODIFICATION

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15
Q

faciolingual loss of tissue width with normal ridge height’s

A

Class I Defects

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16
Q

loss of ridge height with normal ridge width

A

Class II Defects

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17
Q

a combination of loss in both dimensions involved

A

Class III Defects

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18
Q

→ not aesthetically challenging
→ surgical augmentation of ridge width is uncommon

A

CLASS I DEFECTS

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19
Q

→ roll technique tissue augmentation
→ the epithelium is removed and the tissue is thinned and rolled
back upon itself

A

CLASS I DEFECTS

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20
Q

a wedge-shaped connective tissue graft is inserted into a pouch preparation on the facial aspect of the residual ridge

A

INTERPOSITIONAL GRAFT

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21
Q

→ a thick “free gingival graft” harvested from partial or full thickness palatal donor sites
→ designed to increase ridge height but also contributes to ridge width

A

ONLAY GRAFT

22
Q

striation cuts are made in connective tissue to encourage revascularization

A

ONLAY GRAFT

23
Q

→ ridge-lap
→ modified ridge-lap
→ ovate
→ conical

A

Mucosal Contact

24
Q

→ sanitary (hygienic)
→ modified sanitary
(hygienic)

A

No Mucosal Contact

25
Q

→ easy cleaning because its tissue surface remains clear of the residual ridge
→ disadvantages include entrapment of food particles, which may lead to tongue habits that annoy the patient

A

Sanitary or Hygienic Pontic

26
Q

concave fitting surface that overlaps the residual ridge buccolingually

A

Saddle and Ridge-Lap Pontic

27
Q

should be avoided because the concave gingival surface of the pontic is not accessible to cleaning with dental floss, which leads to plaque accumulation

A

Saddle and Ridge-Lap Pontic

28
Q

→ combines the best features of hygienic and saddle pontic designs, combining esthetics with easy cleaning
→ pontic overlaps the residual ridge on the facial side but clears the ridge on the lingual side

A

Modified Ridge-Lap Pontic

29
Q

egg-shaped, bullet-shaped, or heart-shaped

A

Conical Pontic

30
Q

→ easy for the patient to keep clean
→ recommended for the replacement of
mandibular posterior teeth, for which esthetic
appearance is a lesser concern

A

Conical Pontic

31
Q

only one point of contact: at the center of the
residual ridge

A

Conical Pontic

32
Q

→ its convex tissue surface resides in a soft tissue depression or hollow in the residual ridge, which makes it appear that a tooth is literally emerging from the gingiva

A

Ovate Pontic

33
Q

→ socket-preservation techniques should be performed at the time of extraction to create the tissue recess from which the ovate pontic form will appear to emerge
→ a socket depression is sculpted into the ridge with surgical diamonds, electrosurgery, or a dental laser

A

Ovate Pontic

34
Q

→ socket-preservation techniques should be performed at the time of extraction to create the tissue recess from which the ovate pontic form will appear to emerge
→ a socket depression is sculpted into the ridge with surgical diamonds, electrosurgery, or a dental laser

A

Ovate Pontic

35
Q

→ pontic possesses an ovate form with the apex positioned more facially on the residual ridge, rather than at the crest of the ridge
→ cleansing of this pontic is also purported to be easiest of all pontic types

A

Modified Ovate Pontic

36
Q

→ pressure-free contact between the pontic and the underlying tissues
→ passive contact should occur exclusively on keratinized attached tissue

A

Ridge Contact

37
Q

→ should provide good esthetic results
→ biocompatibility, rigidity, and strength to withstand occlusal
forces and longevity

A

PONTIC MATERIAL

38
Q

→ glazed porcelain is generally considered the most biocompatible of the available pontic materials
→ highly polished surfaces accumulate plaque if oral hygiene measures are ignored
→ well-polished gold is smoother, less prone to corrosion, and less retentive of plaque than is an unpolished or porous casting

A

PONTIC MATERIAL

39
Q

T or f

the buccal and lingual width of the pontic reduced by 30% to lessen occlusal force only when food of uniform consistency is chewed

A

T

40
Q

T or f

harmful forces are more likely to be encountered if an FDP is loaded by the accidental biting on a hard object or by parafunctional activities such as bruxism, rather than by chewing of foods

A

T

41
Q

T or f

narrowing the occlusal surface may actually impede or even preclude the development of a harmonious and stable occlusal relationship

A

T

42
Q

→ strong, easy to keep clean, looks natural
→ uniform veneer of porcelain (approximately 1.2 mm)
→ voids at the porcelain-metal interface will reduce bond strength
and increase the possibility of mechanical failure
→ sharp angles on the veneering area should be rounded
→ occlusal centric contacts must be placed at least 1.5 mm away
from the junction

A

METAL-CERAMIC PONTICS

43
Q

→ acceptable only as longer-term interim restorations
→ their resistance to abrasion was lower than that of enamel or porcelain and noticeable wear occurred with normal
toothbrushing

A

RESIN-VENEERED PONTICS

44
Q

→ no chemical bond existed between the resin and the metal
framework and so the resin was retained by mechanical means
→ easy to manipulate and repair and do not require the
high-melting range alloys
→ new-generation indirect resins have a higher density of
inorganic ceramic filler

A

RESIN-VENEERED PONTICS

45
Q

→ can be used in partial FPDs without a metal substructure
→ a substructure matrix of impregnated glass or polymer fiber
provides structural strength
→ excellent marginal adaptation and esthetics
→ long-term clinical performance is not yet known

A

FIBER-REINFORCED COMPOSITE RESIN PONTICS

46
Q

the modified ridge-lap pontic is recommended for most anterior situations; it compensates for lost buccolingual width in the residual ridge by overlapping what remains

→ sometimes the ridge tissue must be surgically reshaped to enhance the result

A

GINGIVAL INTERFACE

47
Q

→ duplicating the original tooth is not possible
→ ridge resorption makes such a pontic look too long in the
cervical region
→ shape the pontic to simulate a normal crown and root with
emphasis on the cementoenamel junction
→ the root can be stained to simulate exposed dentin
→ use pink porcelain to simulate the gingival tissues

A

INCISOGINGIVAL LENGTH

48
Q

→ space available for a pontic is greater or smaller than the width of the contralateral tooth
→ if possible, such a discrepancy should be corrected by orthodontic treatment
→ an acceptable appearance may be obtained by incorporating visual perception principles into the pontic design

A

MESIODISTAL WIDTH

49
Q

→ a pontic of abnormal size may be designed to give the illusion of being a more natural size
→ alteration in the shape of the proximal areas
→ retainers and the pontics can be proportioned to minimize the
discrepancy

A

MESIODISTAL WIDTH

50
Q

→ allows for easy plaque removal and has good strength, wear resistance, and esthetics
→ the metal framework for the pontic and one or both of its retainers is then cast in one piece

A

METAL-CERAMIC PONTICS

51
Q

→ wax pattern is made to the final anatomic contour
→ to assess connector design adequacy and the relationship between the connectors and the proposed configuration of the
ceramic veneer

A

ANATOMIC CONTOUR WAXING

PROSTHO (17 decks)

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