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Related Experiment Videos

Soft tissue changes associated with double jaw surgery.

A C Jensen1, P M Sinclair, L M Wolford

  • 1University of North Carolina.

American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics
|March 1, 1992
PubMed
Summary
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Soft tissue changes after combined jaw surgery resemble single-jaw procedures, with specific upper lip and chin area variations. Surgical techniques significantly influence upper lip response and overall outcomes.

Area of Science:

  • Orthognathic surgery
  • Craniofacial surgery
  • Plastic surgery

Background:

  • Simultaneous maxillary impaction and mandibular advancement surgery involves complex skeletal movements.
  • Understanding soft tissue response is crucial for predicting aesthetic and functional outcomes.
  • Previous studies often focused on single-jaw procedures, leaving combined surgery outcomes less defined.

Purpose of the Study:

  • To quantify and analyze the amount, direction, and predictability of soft tissue changes following combined maxillary impaction and mandibular advancement.
  • To compare soft tissue responses in combined surgery to those observed in single-jaw procedures.
  • To identify surgical techniques influencing soft tissue behavior, particularly in the upper lip and nasolabial region.

Main Methods:

Related Experiment Videos

  • Analysis of pre- and post-operative cephalometric radiographs.
  • Measurement of soft tissue displacement at key facial landmarks.
  • Correlation of soft tissue changes with specific surgical techniques (e.g., alar base cinch suture, V-Y closure).

Main Results:

  • Maxillary soft tissues moved forward approximately 90% of the hard tissue change, with 20% upper lip shortening.
  • Nasolabial angle changes were primarily linked to the degree of maxillary rotation.
  • Mandibular soft tissues showed predictable horizontal advancement (73% at lower lip to 100% at pogonion) and increased vertical movement, especially at the lower lip.

Conclusions:

  • Soft tissue responses to combined maxillary impaction and mandibular advancement are largely similar to single-jaw procedures, with notable exceptions in the nasolabial angle and lower lip/chin.
  • Surgical techniques like alar base cinch suture and V-Y closure significantly impact upper lip soft tissue response.
  • Predictable patterns of soft tissue movement exist for both maxillary and mandibular components, aiding in surgical planning and outcome assessment.