3- Asthetic Consideration

8/13/2019 3- Asthetic Consideration

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Esthetic consideration

Esthet ic is the study of beauty .

Kn ow ledg e of es the tic help the dentist to achieve a

pleasing facial appearance, particularly when thepatient smiles,

Teeth contours, size, incisal edges, occlusal plane,and midline must be in h a r m o n y .

Many of these pr inc ip les can be applied to fixedrestorations in the appearance zone .



Appearance Zone:

When a person smiles, hedisplays maxillary anterior andpremolar teeth.

The zone frequently alsoincludes maxillary first molars.

It varies acc. to mouth size,smile width, tooth length, lipsize and tightness, and perhapsthe patient's self-image





The smile line or incisal curve

it is composed of the incisal edges of themaxillary anterior teeth that

parallels inner-curvature of the lower lipparallel the interpupillary axisperpendicular to the midline.



Smile line

Extensive smile which shows thecomplete outline of maxillary anteriorteeth and teeth posterior to the firstmolar is considered to be most attractiveand youthfulSmile in the elderly people shows less ofmaxillary and more of mandibular teethIn ideal smile the incisal edges ofmaxillary incisors are parallel to lower lip



Princ ip les o f es th et ic :

1- The principle of color .( Hue – chroma – value )

2- The principles of form .Perception Cultural

Artistic

principle of illumination principle of line

3- The principles of illusion .



The principles of form

PerceptionAs we look at a tooth in an environment ofother teeth, we perceive unconsciously

many qualities of that tooth such as :color, size, shape, age, and sex

Perceptual biases can be divided intotwo types1- cultural 2- artistic.

Principles1 The principle of color .2 The principles of form .3 The principles of illusion .



The principles of formPerceptual biases:1- cultural2- artistic.

1- Cu ltu ral biases: Cultural biases are

naturally occurringenvironmentalobservations aboutthe world around us.



We perceive that darker, heavily worn,highly stained, longer teeth belong to aperson of an older




We perceive and believe rounded, smoothflowing forms are feminine , whereas harsher,more angular forms are masculine.




Facto rs related to p erc ep tualcu l tura l b iases :

1- Age : A - Older teeth :

1- Are smoother anddarker (i.e. not asbright, lower value )

2- Have a highersaturation (higherchroma )

Factors of cu l tura l b iases :

1- Age ( older , younger teeth )

2- sex ( muscline and feminine )



3- Shorter incisally

4- Are longer gingivally

5- Have worn, with littleincisal embrasures

6- Have wider more opengingival embrasures

7- Are more characterized

1- Age :

A - Older teeth :


1- Age ( older and younger teeth


3

45

6

7



1- Are more lighter

2-Have a lower saturation(lower chroma )

3- Have a gingival marginat approximately the CEJ

4- Have incisal edges thatmake the laterals appearshorter than the incisorsor canines

1- Age :

B - You ng er teeth :






5- Have significant incisalembrasures

6- Have small gingivalembrasures

7- Have lightcharacterization, oftenwith white hypoplastic

lines or spots

1- Age :

B - You ng er teeth :






2- Sex :

A - Masc ul ine teeth :




1- more angular and rugged

2- In older men, chroma is greater

3- The incisal embrasures are moresquared and not as pronouncedas in teeth appearing more

flowing and feminine.

4- Characterization is oftenstronger, incorporating darkercraze lines



2- Sex :

B - Fem inine teeth :




1- more rounded

2- pronounced incisalembrasures

3- Translucent incisal edges

4- The translucency on theincisal edges appears as agray line in the incisal 1/8 ofthe facial surface




2- A rt is t ic b ias es :

artistic biases are inherent

subconsciously in ourperception of form.

The most important of

these is :1- principle of illumination

2- principle of line



A - pr in c ip le of i llum inat ion :

2- A rt is t ic b ias es : Artistic biases:A- principle of illuminationB- principle of line .

the perception that lightapproaches and dark recedes

areas that are light appear tocome forward, whereas darkerappear to recede Thisproduces the illumination of3D (depth).



A - p r inc iple o f l in e :

2- A rt is t ic b ias es : Artistic biases:A- principle of illuminationB- principle of line .

The second artistic bias thatof great importance indentistry is the use ofhorizontal and vertical lines.

A horizontal line will makean object appear wider,whereas a vertical line willmake an object appear

longer .



p r in c ip le of l ine :

2- A rt is t ic b ias es :



The principles of illusionPrinciples1 The principle of color .2 The principles of form .3 The principles of illusion .

Def . : the art of changing perception to cause anobject different than it actually is .

understanding basic principles of perception mustprecede utilization of this principle to control illusion

Examples :placement of mesiofacial and distofacial line anglescloser produce the illusion of narrow teethn vice versa



placement of flatincisal edge willproduce a straightline that give theillusion of widerteeth while roundedincisal edge givethe illusion ofnarrowing .

The principles of illusionPrinciples1 The principle of color .2 The principles of form .3 The principles of illusion .



Factors Affecting Dental Esthetics



1-Individual tooth factors

Protrusionstaining

fracturedrough

shape



2- Material selected to replacing metal

-acrylic (bluish margin).

- dental porcelain.



3- Relationship of anterior teeth to lower lipline.

-The upper incisal edges should be parallel toinner curvature of lower lip which increases the

sense of balance.



4-Tongue thrust:

abnormal habit of placing the tongue between the teeth before and during the act of swallowing . Symptoms:

-mouth breathing.-an open bite condition of the teeth.-difficulty with speech.

- at rest, an open mouth posture with a forward tongue position is noted.

http://www.braceface.com/patients/xryob.jpg



5-Variations in the level of gingival line.

The position, contour, and bulk of the gingiva on thecrown of the tooth determines the perception oftooth length and width



6-Age of the patient

Old age → gingival recession → bad dental

esthetics



7-Deviate swallowing

An abnormal swallow will move teeth into abnormal positionsand cause growth distortions of the face and teeth.

-retruded lower jaw-long narrow face with lack of development of the maxilla

-flaccid muscles of the lips.-

-lips which do not touch without contracting the chin muscles

narrow, abnormal development of the palate



8-Spacing of teeth

distraction to the person you are speaking with. Divert his attention from face to that defect.

Correction:young person, normal dentitions,), permanent solution(orthodontics:-

,. composite applied in a single visit ,result, permanent solution-a semi(bonding:-

immediately. teeth are susceptible to chipping, cracking and staining. The material isexpected to last 3 - 5 years. )

long lasting solution , effective in not uniform spaces ,the ceramic material:(veneering -

used to construct veneers is much stronger than resin and gives a very natural and life-like appearance to the treated teeth, higher cost of the procedure.

long lasting solution , more time and additional cost,give a very pleasing result..:crown-



9-periodontal health

Bad periodontal health lead to bad dentalesthetics



10-Length of the span of missing teeth

Short span: super eruption of the opposing teeth tilting of the neighboring teeth →

decrease the space for replacing

artificial teeth→bad esthetics.

Long span: wrinkling of the face and over closure of the lips.



11-Splinting requirements

-Splinting is a process wherethe teeth are joined together

to increase their strength.

-After this process is completed these teeth will require specialare important to clean area . brushingCarefulcare.

-Regular dental exams every three months will be necessary to

maintain the care of the splint and insure good dental care.

http://www.dentalgentlecare.com/toothbrushing_flossing_fluroide.htm

http://www.dentalgentlecare.com/toothbrushing_flossing_fluroide.htm



12-Bruxism

-It is a habit of clenching and grinding of teeth. -manifested by enamel loss from the chewing surfaces of

teeth; flattened tooth surfaces; loosened teeth; and fracturedteeth and fillings. Left untreated, bruxism may lead to toothloss and jaw dysfunction.

.



13-Patients wishes, educational level

Patient with low level of educationPrefer gold restoration.



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3- Asthetic Consideration