Sixth 3

Question 1

Does Violating conformity of surface texture (characteristics of natural teeth ) cause unwanted prominence of your restoration ?

Answer 1

Yes , it determine how light reflected , transmitted , scattered and thus effect hue , chroma , value , translucency

Question 2

How does appearance of tooth determined ?

Answer 2

By how light interacts with the curved and varied surfaces

Heavy texture = more directions of reflection = less value

Question 3

Which surface of tooth is the most important for aesthetic restoration and why ?

Answer 3

Buccal surface and it must be matched cause it determine how light interacts with the curved and varied surfaces

Attractive prosthodontic replacement starts with a consistent silhouette and shape of the buccal surface

Question 4

Which surface of tooth is the most important for aesthetic restoration and why ?

Answer 4

Buccal surface it’s the must important and must be matched cause they determine how does majority of light will be reflected

Attractive prosthodontic replacement starts with a consistent silhouette and shape of the buccal surface

Question 5

Which tooth or restoration characteristic we see them from 5-6 fits away and which we must be close enough ?

Answer 5

Hue , chroma fairly enough close

Value , surface texture , opacity , disparities 5-6 fits away

Question 6

Which tooth or restoration characteristic we see them from 5-6 fits away and which we must be close enough ?

Answer 6

Hue , chroma fairly enough close

Value , surface texture , opacity , disparities 5-6 fits away

Question 7

Because we mainly see the surfaces of a tooth that are perpendicular to us, WHAT we can manipulate and how it affect the surface width and length of the restoration?

Answer 7

Cause we see only the perpendicular surface we can manipulate the perceived width and length by bending or flattening the surface , you can make the tooth look narrow or shorter by decreasing the width or length of the direct buccal reflective surface .

Question 8

Because we mainly see the surfaces of a tooth that are perpendicular to us, WHAT we can manipulate and how it affect the surface width and length of the restoration?

Answer 8

Cause we see only the perpendicular surface we can manipulate the perceived width and length by bending or flattening the surface , you can make the tooth look narrow or shorter by decreasing the width or length of the direct buccal reflective surface .

Question 9

How does maxillary incisors that are tipped lingually appear ?

Answer 9

They don’t reflect light , appear dark

Question 10

How can we made the smile uniform without re-slinging the teeth ?

Answer 10

Bright it up

Question 11

What’s specular reflection ? give an example ?

Answer 11

returns a high percentage of direct non-diffused ( straight , more directional )light, and if strongly illuminated, will be brighter and stand out .

Reflection from a smooth, mirror-like surface results in the production of a clear well defined image.

Question 12

How does smoothing the texture of buccal surface will make teeth appear ?

Answer 12

Smoothing the texture of the buccal surface will make teeth appear lighter and brighter and therefore a primary determinate of value.

Cause light it doesn’t reflect in many directions

Question 13

How does smoothing the texture of buccal surface will make teeth appear ?

Answer 13

Smoothing the texture of the buccal surface will make teeth appear lighter and brighter and therefore a primary determinate of value.

Question 14

Which with time become smooth with specular reflective characteristics convexities or concavities ?

Answer 14

Most teeth have irregular surfaces with convexities and concavities. The convexities tend to wear and become smooth with specular reflective characteristics

Question 15

What’s The visual impact of a tooth comes from these specular highlights of convecities wear

Answer 15

give the tooth its visual shape.

Question 16

What’s The visual impact of a tooth comes from these specular highlights of convecities wear

Answer 16

give the tooth its visual shape.

Question 17

How teeth concavities deal with light and what’s the reason behind ?

Answer 17

Concavities tend to collect light by reflecting inwards and tend to be unpolished, thus diffusing the light and less re- turns to the viewers eye = low value

Question 18

Which restoration colours appear more close to you and which far ?

Answer 18

Bright objects , appear close to the viewer and it’s why light restorations appear to jump out to you

Lowering value ( brightness ) make the object far away

Question 19

After shaping and contouring what’s the most next improtant factors affecting how light interplays with tooth surface ?

Answer 19

Surface texture , luster

Question 20

How A roughened surface texture affect light ?

Answer 20

will not yield as well defined an image and will scatter the light and the individual wavelengths will all bend differently yielding a substantially different spectrum returning to the eyes

Question 21

What’s parekymata?

Answer 21

Transverse , wavelike grooves , external manifestations of striae of retzius

Question 22

What’s happen to parekymate by aging ?

Answer 22

Tend to wear ( abrade ) by age resulting in horizontal grooves transverse the tooth , separated by distance much greater the original one .

Question 23

What’s happen to parekymate by aging ?

Answer 23

Tend to wear ( abrade ) by age resulting in horizontal grooves transverse the tooth , separated by distance much greater the original one .

Question 24

Explain the shape and direction of parekymata

Answer 24

These horizontal grooves can be convexities and/or concavities and they stretch in a flat to U shape (bottom of U towards gingival) across the buccal surfaces of the maxillary incisors (Figure 16).

These horizontal undulations get flatter and closer together going gingivally.

They never cross each otherand they go circumferentially.

Question 25

What’s happen to parekymata gingivally , what’s the link between parekymata and concentra-tions of dechromatized white enamel so often that found in youngers ?

Answer 25

There tends to be more stippling of these textures gingivally. The concentra- tions of dechromatized white enamel so often found in younger more superficial layers of enamel are often associated with horizontal textures.

Question 26

Which we do first horizontal or vertical texture and why ?

Answer 26

Horizontal textures are formed on top of vertical tex- tures, meaning the horizontal patterns follow into the concavities formed by the vertical but the vertical are not affected by the horizontal. When texturizing your restoration, carve the vertical textures first and then horizontal .

Question 27

What’s Malformations texture ?

Answer 27

are the third textural group and can be from cracks, chips, and other surface aberrations.

Question 28

What’s the 3 texture subgroups ?

Answer 28

Vertical ( height of contour of marginal ridges , developmental lobes )
Horizontal
Malformation

Question 29

What’s the 3 surface texture grades ?

Answer 29

Heavy
Medium
Light

Question 30

How does heavy ( rough ) surface texture deal with light ? And in which ages appear ?

Answer 30

Tend to diffuse light by reflecting it many directions and less light return to the viewer .
At eruption .

Question 31

How light texture affect light ?

Answer 31

Higher the value due to increase specular reflection

Question 32

When the tooth appear smooth with highly reflective glassy surface ?

Answer 32

When all parekymata signs lost and even developmental grooves is obliterated