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A Mixed Vertical Preparation Approach for Crown Replacement: A Concept-Driven Clinical Report.

David Gerdolle, Fernando Marcos Soto, François Vigouroux

The International Journal of Periodontics & Restorative Dentistry

|June 26, 2026

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A new mixed vertical preparation strategy balances periodontal health and prosthetic control in dental crown retreatment. This technique uses Biologically Oriented Preparation Technique (BOPT) on the vestibular surface and VertiPrep on others for better outcomes.

Area of Science:

Dentistry
Prosthodontics
Periodontology

Background:

Full circumferential Biologically Oriented Preparation Technique (BOPT) in prosthetic retreatment is technique-sensitive.
Achieving both periodontal tissue conditioning and prosthetic margin control can be challenging.

Purpose of the Study:

To describe a mixed vertical preparation strategy for prosthetic retreatment.
To balance esthetic demands with prosthetic predictability and periodontal health.

Main Methods:

A selective literature review and a clinical case report.
Implementation of a mixed vertical preparation: BOPT on the vestibular surface and VertiPrep on proximal/palatal surfaces.
Provisional restoration-driven soft tissue maturation over 6-8 weeks.

Keywords:

crowns; dental prosthesis design dental marginal adaptation dental restoration periodontal tissue prosthodontic temporary tooth preparation

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Main Results:

Localized vestibular tissue conditioning improved marginal tissue thickness.
Proximal and palatal VertiPrep ensured precise margin positioning.
The approach balanced soft tissue conditioning with margin control.

Conclusions:

The mixed vertical preparation is a pragmatic option for selected crown retreatment cases.
It effectively balances vestibular soft tissue conditioning with proximal/palatal margin control.
Further prospective studies are needed to confirm long-term predictability.