Maxillary lip dynamics and gingival display revisited: Utilizing standardized metrics

Area of Science:

• Dentistry
• Facial Aesthetics
• Biomechanical Analysis

Background:

• Accurate assessment of maxillary lip dynamics is essential for predictable aesthetic dental outcomes.
• Gingival display and tooth exposure during smile are influenced by lip movement.
• Previous research has not fully established reliable methods for quantifying lip dynamics.

Purpose of the Study:

• To validate a predictable system for establishing maximum maxillary lip dynamics.
• To highlight the clinical significance of accurately measuring lip dynamics in dental procedures.
• To investigate the relationship between age and maxillary lip dynamics.

Main Methods:

• Digital analysis of photographs of 75 subjects (age 25-71) with lips in maximum and minimum reveal.
• Statistical analysis using Pearson correlation coefficient to assess age-related changes.
• Measurement of maxillary lip movement at central incisor and cuspid positions.

Main Results:

• Posterior gingival display was more common than anterior gingival display.
• Maxillary lip movement was greater at the cuspid compared to the central incisor.
• A positive correlation was observed between lip dynamics at the right central incisor and right cuspid.

Conclusions:

• Maxillary lip dynamics do not appear to decrease with increasing age.
• Increased lip dynamics at the cuspid may correlate with increased dynamics at the central incisor.
• Accurate measurement of lip dynamics aids in avoiding aesthetic complications in restorative dentistry.