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Augmentation genioplasty with hard tissue replacement implants

S C Karras1, L M Wolford

  • 1Baylor College of Dentistry and Baylor University Medical Center, Dallas, TX, USA.

Journal of Oral and Maxillofacial Surgery : Official Journal of the American Association of Oral and Maxillofacial Surgeons
|May 20, 1998
PubMed
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Hard tissue replacement (HTR) polymer chin implants effectively augment the chin, providing aesthetic improvements. These implants demonstrate dimensional stability and do not cause bone resorption, making them a predictable option for augmentation genioplasty.

Area of Science:

  • Plastic Surgery
  • Biomaterials Science
  • Craniofacial Surgery

Background:

  • Augmentation genioplasty aims to improve facial aesthetics by enhancing chin projection.
  • Hard tissue replacement (HTR) polymers offer a biocompatible solution for bone and soft tissue augmentation.
  • Assessing the long-term effects of HTR implants on soft tissues and bone is crucial for clinical application.

Purpose of the Study:

  • To evaluate soft tissue changes following HTR polymer chin implant placement.
  • To assess the dimensional stability of HTR implants used in augmentation genioplasty.
  • To investigate potential bony changes, specifically resorption, associated with these implants.

Main Methods:

  • A cohort of 18 patients (15 female, 3 male) underwent augmentation genioplasty using intraorally placed HTR polymer chin implants.

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  • Implants were secured with a single 2.0-mm titanium screw to the symphysis.
  • Cephalometric radiographs were analyzed preoperatively, postoperatively, and long-term (average 21.5 months) to measure soft tissue thickness, implant stability, and bone resorption.

    • Main Results:

    • Achieved an average hard tissue chin augmentation of 6.0 mm.
    • Soft tissue projection increased by an average of 77.6% of the implant thickness.
    • No radiographic evidence of implant migration or bone resorption beneath the HTR implants was observed.

    Conclusions:

    • HTR polymer chin implants provide predictable and aesthetically desirable augmentation.
    • These implants demonstrate excellent dimensional stability.
    • HTR implants do not induce resorption of the underlying mandibular bone, indicating a safe profile.