CATEGORY 38 AUSTRALASIAN DENTIST Introduction: Aesthetics has become a fundamental component in contemporary orthodontic practices which extends beyond functional occlusion to encompass facial harmony and smile dynamics. The consideration of incorporating macro-, mini-, and microaesthetics has become important in orthodontic practice. This includes facial proportions, soft tissue balance, smile arc, gingival display, and tooth-lip relationships. A thorough aesthetic evaluation ensures that orthodontic outcomes align with both clinical objectives and patient expectations, supporting a holistic approach to facial and dental integration. Macro aesthetics: Facial analysis begins with the assessment of the frontal view for symmetry [Fig 1], proportions, and profile. The face is evaluated for symmetry using the rule of fifths – horizontally (divided into fifths for eye, nose, and mouth width alignment) and the rule of thirds-vertically (thirds from hairline to eyebrows, nose base, and chin). It all started with the Renaissance artists like da Vinci who established these proportions and modern data confirms their general validity. There exist slight variations among the ethnicities and individuals and clinicians should consider these norms while recognizing cultural and individual aesthetic differences. Facial Proportion Diagram Description Vertical Thirds: u First Third: From the hairline to the eyebrows. u Second Third: From the eyebrows to the base of the nose. u Third Third: From the base of the nose to the bottom of the chin. Horizontal Fifths: The face is divided into five equal vertical sections: 1. From the outer edge of the left ear to the outer corner of the left eye. 2. From the outer corner to the inner corner of the left eye. 3. Middle fifth: the distance between the inner corners of the eyes, ideally the width of the nose. 4. From the inner corner to the outer corner of the right eye. 5. From the outer corner of the right eye to the outer edge of the right ear. Profile analysis: The next important clinical examination is the facial profile analysis. For this, a line is dropped vertically from the bridge of the nose to the base of the upper lip, and a second line extends from that point to the chin. Ideally, these two segments form a nearly straight line, indicating balanced facial proportions. If the angle between them exceeds about 10 degrees, it suggests a disharmony in profile [Fig 3]: A convex profile (where the upper jaw is CLINICAL Smile Analysis Part I Macro Aesthetic Dr Geoff Hall By Dr Geoff Hall, BDsc (Melb) Cert Orth (Uni of Penn) MRACDS (Orth), Diplomate – American Board of Orthodontics (ABO) Macroaesthetics Mini-aesthetics Microaesthetics Facial Proportions Smile Arc Analysis Tooth Proportions (Height-to- (Vertical & Horizontal) Width Relationships) Facial Balance and Buccal Corridors Gingival Heights, Shape, and Symmetry Contours Facial Profile Amount of Gingival and Connectors and Embrasures (Profile Analysis) Incisor Display Evaluation of Lip Posture Tooth-Lip Relationships Tooth Shade and Colour and Incisor Prominence A GLIMPSE INTO BROAD SPECTRUM-AESTHETICS: Fig 1: Facial asymmetry: Measurement of roll discrepency using a tongue blade. Fig 2: Facial proportions: Rule of thirds for vertical proportion and rule of fifths for horizontal proportions1. Fig 3: Facial profile3.
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