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Flashcards in Terms Deck (62):
1

Adaptation

The degree of fit between a prosthesis and supporting structures or degree of proximity of a restorative material to a tooth preparation

2

Axial Inclination

The alignment of the long axis of a tooth to a selected plane often the horizontal plane

3

Axis of Preparation

The planned line or path of placement and removal for a dental restoration

4

Bevel

A slanting edge

5

Beveling

The process of slanting the finish line and curve of a tooth preparation

6

Bur

A steel or tungsten carbide rotary cutting instrument

7

Bur Head

The cutting portion of a dental bur

8

Bur Head length

The axial dimension of the bur head

9

Bur head shape

The geometrical outline form of the cutting surface edges, usually described successively by proximity from the shank to the tip end

10

Bur Shank

The component of a dental bur which fits into the hand piece; the shaft section fo the dental bur that may be friction gripping or latch type in form

11

242 Bur

.8

1.2 length

12

747 Bur

.6

1-1.1 Length

13

Butt

To bring any two flat ended surfaces into contact without overlapping , as in a butt joint

14

Chamfer

A finish line design for tooth preparation in which the gingival aspect meets the external axial surface at an obtuse angle. Small groove or furrow. Surface found by cutting away the angle of intersection of two faces of a piece of material: a beveled edge

15

Chamfering

To cut or furrow in. To bevel. Thought of as producing a curve from the axial wall to the cavosurface

16

Chamfer Angle

THe angle between a chamfered surface and one of the original surfaces from which the chamfer is cut

17

Clearance

A condition in which bodies may pass each other without hindrance. Also the distance between bodies.

18

Clinical Crown

The portion of a tooth that extends from the occlusal table or Invisalign edge to the free gingival margin

19

Complete Crown

A restoration that covers all the coronal tooth surfaces

20

Convergence Angle

The taper of a crown preparation. The angle measured in degrees formed between opposing axial walls when a tooth or teeth are prepared for single crowns or fixed dental prostheses.

21

Crown

The highest part as the topmost part of the skull, head or tooth; the summit that portion of a tooth occlusal to the dentionamel junction or an articulated substitute for this. An artificial replacement that restores missing tooth structure by surrounding part or all of the remaining structure with a material such as cast metal porcelain or combination of materials such as metal and porcelain

22

Crown (verb)

To place on the head as to place a crown on a tooth dental implant or tooth substitute; USAGE: implies fabrication of a restoration for a tooth on a natural tooth dental implant and or dental implant abutment

23

Deformation

The change of form or shape of an object

24

Dentin

A calcerous material similar but harder and denser than bone that compile is the principal mass of the tooth

25

Divergence

A drawing apart as a surface extends away from a common point; the reverse taper of walls of a preparation for a restoration

26

Divergence Angle

The sum of the angles of taper of opposing walls of a tooth preparation that diverge away from each other

27

Draw

The taper or convergence of walls of a preparation for a restoration

28

Extracoronal

Which is outside or external to the crown portion of a natural tooth

29

Extracoronal Retainer

That part of a fixed dental prosthesis uniting the abutment to the other elements of a prosthesis that surrounds all or part of the prepared crown

30

Finish Line

A line of demaracation determined by two points. The peripheral extension of a tooth preparation the planned junction of different material. The terminal portion of the prepared tooth.

31

Fit

To conform to the shape or size. To insert or adjust until correctly in place; to make or adjust to the correct size or shape to adapt one structure to another as the adaptation of any dental restoration to its site in the mouth

32

Groove

A long narrow channel or depression such as the indentation between tooth cusps or retentive features placed on tooth surfaces to augment the retentive features placed on tooth surfaces to augment the retentive characteristics of crown preparations

33

Interocclusal clearance

The arrangement in which the opposing occlusal surfaces may pass one another without any contact. The amount of reduction achieved during tooth prepariotn to provide for an adequate thickness of restorative material

34

Line Angle

The point of convergence of two planes in a cavity preparation

35

Lingual Inclination

Of the coronal portion of a tooth from the vertical plane toward the tongue

36

Long Axis

A theoretical line passing length wise through the center of a body

37

Margin

THe outer edge of a crown inlay inlay or other restoration. The boundary surface of a tooth preparation and/or restoration is termed the finish line or finish curve

38

Path of placement

The specific direction in which a prosthesis is placed on the abutment theta or dental implants

39

Point Angle

In the development of a cavity preparation, that place of convergence of three planes or surfaces

40

Retention

That quality inherent in the prosthesis acting to resist the forces of dislodgment along the path of placement

41

Retention Arm

An extension that is part of a removable dental prosthesis and is used to aid in the fixation of the prosthesis; a part of a clas

42

Retention Form

The feature of a tooth preparation that resists dislodgment of a crown in a vertical direction or along the path of placement

43

Shoulder Finish Line

A finish line design for tooth preparation in which the gingival floor meets the external axial surfaces at approximately a right angle

44

Supragingival

Located above the gingiva. The portion of a natural or artificial tooth that is coronal to the gingival crest

45

Taper

The convergence of 2 opposing external walls of a tooth preparation as viewed in a given plane. The extension of those average lines within that plane form an angle describe as the angle of convergence

46

Undercut

The portion of the surface of an object that is below the height of contour in relationship to the path of placement. The contour of a cross sectional portion of a residual ridge or dental arch that prevents the insertion of a dental prosthesis. Any irregularity in the wall of a prepared tooth that prevents with the withdrawal or seating of aw ax pattern or casting

47

Undercut (verb)

To create areas that provide mechanical retention for materials placement

48

Veneer

A thin sheet of material usually used as a finish. A protective or ornamental facing. A superficial or attractive display in multiple layers, frequently termed laminate veneer.

49

3 Principials of tooth preparation

Biological considerations- affect the health of oral tissues
Mechanical - integrity and durability
Esthetic consideration-appearance

50

Biological considerations

Prevention of Damage:
Soft tissues
Pulp
Adjacent Teeth

Considerations affecting future dental health
Axial reduction
Margins
Occlusal considerations
Preventing tooth fractures

51

Mechanical Considerations

Providing resistance form
Providing retention form
Preventing deformation of the restoration (alloy selection, adequate reduction, margin design)

52

CVC

Complete Veneer Crown

A cast gold extracoronal restoration which covers the CLINICAL crown

53

MCC

Metal ceramic crown

54

ACC

All ceramic crown

55

Indications for a single Crown

Extensive coronal destruction
Short clinical crowns
Endo treated teeth
Maximum retention and resistance are needed
Correction of axial contours

56

Contraindications for Single Crown

Wherever an intact buccal or lingual wall exists
If less than maximum retention and resistance are needed
If objectives can be met with a more conservative restoration

57

Advantages of Crown

Greater retention than a more conservative restoration

Greater resistance form than a partial coverage restoration on the same tooth

A complete cast crown allows the operator to modify axial tooth contour as well as occlusal modification

58

Disadvantages of crowns

Adverse effects n the pulp and periodintium

No longer electric vitality testing

Patient object to metal display

59

The long axis is determined by

Bisecting the angle formed by opposing axial surfaces in the gingival third of the tooth

60

Convergence angle

2-10 degrees

The angle or taper formed by opposing axial walls

61

CVC Dimensions

Central groove 1
Functional cusps 1.5
Nonfunctional cusps 1
Chamfer width .5

62

Guide grooves

Should be .2 less than ideal