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Updated: Jun 22, 2026

Patterning via Optical Saturable Transitions - Fabrication and Characterization
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Substance-Gain Extrusion Technique (SGET) in Combination With BOPT-Technique Description.

M Pirc1, D Thoma1, L Mancini1

  • 1Clinic of Reconstructive Dentistry, Center for Dental Medicine, University of Zurich, Zurich, Switzerland.

Journal of Esthetic and Restorative Dentistry : Official Publication of the American Academy of Esthetic Dentistry ... [Et Al.]
|May 20, 2025
PubMed
Summary

The substance-gain extrusion technique (SGET) combined with biologically oriented preparation technique (BOPT) offers a minimally invasive method for restoring severely fractured teeth. This approach preserves natural dentition, improves esthetics, and ensures soft tissue stability, serving as a viable alternative to implants.

Keywords:
biologically oriented preparation technique (BOPT)dental implantsrestorative dentistrysurgical extrusiontooth extrusion

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Area of Science:

  • Restorative Dentistry
  • Periodontology
  • Prosthodontics

Background:

  • Deep subgingival tooth fractures present complex restorative challenges.
  • Traditional treatments like orthodontic extrusion or implants can be invasive and costly.
  • Minimally invasive alternatives are sought to preserve natural dentition and optimize outcomes.

Purpose of the Study:

  • To introduce and describe the substance-gain extrusion technique (SGET) as a novel approach for managing deep subgingival fractures.
  • To evaluate the combination of SGET with the biologically oriented preparation technique (BOPT) for predictable restorative solutions.
  • To highlight the benefits of SGET in preserving natural teeth and enhancing esthetic and functional results.

Main Methods:

  • A case study involving a patient with a failed anterior bridge and medical conditions contraindicating extensive surgery.
  • Substance-gain extrusion technique (SGET) using the Benex system for controlled coronal extrusion of a fractured tooth.
  • Restoration following BOPT principles, including fiber post placement, composite core buildup, and zirconia crown fabrication.
  • Comparison with an immediately placed implant-supported crown on the contralateral incisor.

Main Results:

  • Successful preservation of the natural tooth treated with SGET and BOPT.
  • Favorable esthetic and functional outcomes at 6-month follow-up.
  • Radiographic evidence of stable marginal bone levels and excellent soft tissue integration.
  • High patient satisfaction with the restorative outcome.

Conclusions:

  • The combination of SGET and BOPT presents a minimally invasive, cost-effective, and time-efficient alternative to implant therapy for significant tooth structure loss.
  • This technique shows promise for preserving natural dentition while achieving predictable esthetic results and enhancing soft tissue stability.
  • Further long-term clinical data are needed to fully establish the longevity of this approach.