Abstract

The combination protocol for the management of excessive gingival display is based on a comprehensive, etiology-driven approach that simultaneously addresses dentogingival discrepancies, upper-lip hypermobility, and perioral soft-tissue support. Esthetic crown lengthening establishes ideal gingival margins and tooth proportions by correcting altered passive eruption and restoring biologic width, forming the anatomical foundation of smile harmony. Botulinum toxin type A is then used to modulate the activity of the upper-lip elevator muscles, reducing excessive muscular pull and controlling dynamic gingival exposure during smiling. Injectable fillers complement this approach by enhancing perioral architecture, improving lip support, and optimizing upper-lip drape over the dentogingival complex. When applied together, these three modalities act synergistically to correct the structural, functional, and soft-tissue components of gummy smile in a minimally invasive, customizable, and reversible manner, offering high esthetic predictability and patient satisfaction.

The bio-volume concept represents a novel, standalone bio-structural approach for the correction of excessive gingival display, based on the insertion of a pre-customized polymethyl methacrylate (PMMA) plate beneath the upper lip through a surgical flap. This device functions as a physical and biomechanical modulator that limits excessive lip elevation by restricting muscular excursion while simultaneously providing stable structural support to the upper lip. Unlike injectable fillers or neuromodulators, the bio-volume plate offers a permanent, non-resorptive, and highly customized solution that directly controls lip hypermobility through mechanical means rather than pharmacologic action. This concept is particularly indicated in patients with pronounced lip dynamics or vertical facial patterns, where long-term stability and predictable control of gingival exposure are required. The bio-volume technique introduces a new paradigm in gummy smile management by shifting treatment from temporary modulation to permanent biomechanical regulation of upper-lip movement.

Learning Objectives

• Understand the causes of excessive gingival display, including dentogingival, lip, and soft-tissue factors. 
• Explain the combined use of crown lengthening, Botulinum toxin type A, and fillers.
• Describe how these treatments work together to improve smile esthetics. 
• Recognize the role of crown lengthening in correcting gingival levels and tooth proportions. 
• Understand how Botulinum toxin type A reduces upper-lip muscle activity. 
• Identify how fillers enhance lip support and contour. 
• Distinguish between temporary and permanent treatment options. 
• Understand the bio-volume concept using a PMMA plate for lip control. 9. Identify cases suited for the bio-volume technique. 
• Compare outcomes, stability, and invasiveness of different approaches.

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