Esthetic operative DentistryLect. 3

4th stage 2018-2019

-Smile design and golden proportions.

-Shade estimation, Color, the dimensions;

(Hue, Chroma, and Value).

-Occlusion and Aesthetics; Principles of occlusion,

-Anterior guidance, Occlusal plane.

Electromagnetic waves are everywhere and light is only a small part of them. Light is

basically photons and mostly moves as waves.

Color: Color is a property of light. Objects have no color of their own; they just reflect a particular

wavelength from the color spectrum. For example a blue object absorbs all of the avelengths,

except for blue.

Color blindness is the inability to distinguish the differences between certain colors. This

condition results from an absence of color-sensitive pigment in the cone cells of the retina.

White light that is seen by human eye is called as “visible” light (380 nm to 780 nm).

Hue is the name of the color (Red, Orange, Yellow, Green, Blue, Indigo, and Violet). In the

younger permanent dentition, hue tends to be similar throughout the mouth.

Chroma is the saturation or intensity of hue; therefore, it can only be present with hue.

Value is the relative lightness or darkness of color.

In natural teeth there are surface morphologic characterizations known as micro and

macro-texture.

Micro texture tiny grooves, mostly horizontal, that are normally found in young teeth.

Macro texture consists of lobes that, as a rule, divide the buccal face of the tooth into

rather distinct concavities and convexities.

Two objects may appear to be identical colors under a certain kind of light, yet under another

kind of light they may appear totally different. This is called metamerism.

Fluorescence is the absorption of light by a material and the spontaneous emission of light

in a longer wavelength.

Opalescence is the ability of a translucent material to appear blue in reflected light and red-

orange in transmitted light.

Contact relationship of the upper and lower teeth during various activities of the mandible

(mastication, swallowing and speech).

Aesthetically pleasing restorations take a lot of effort to place them properly and also provide proper function with no postoperative problems. Modern materials are being developed every year that can simplify our restorative care when diagnosed and treatment planned properly. By performing a thorough diagnosis of the occlusion prior to treatment planning it will allow clinicians to avoid future complications and costly failures.

Centric Occlusion:

The relation of the upper and lower teeth when they are in maximum intercuspation during

swallowing and the terminal position of the masticatory stroke.

Overbite enables the disclusion of the posterior teeth during food incision and increases the

efficiency of the anterior teeth in biting well.

Overjet increases duration of occlusal contact in protrusive and lateral movements in incising

and mastication.

http://elearn.uobabylon.edu.iq https://publons.com/researcher/1437059/ameer-hamdi-hakeem-alameedee/ http://staff.uobabylon.edu.iq/site.aspx?id=876 http://livedna.net/?dna=964.23578