Vertiprep: The Minimally Invasive Crown Technique Redefining Restorative Dentistry

Vertical tooth preparation using the Vertiprep and BOPT approach allows the crown margin to be positioned in relation to gingival tissue, supporting emergence profile control and soft tissue adaptation.

Introduction: What is Vertiprep?

Most crown preparation techniques rely on a clearly defined margin. Vertiprep is a minimally invasive crown preparation that takes a different approach. It uses vertical tooth preparation with no fixed finish line, so the position of the gingival tissue determines where the crown margin ultimately sits.

This approach is often described as shoulderless crown preparation or feather edge preparation. It focuses on preserving tooth structure while supporting a restoration that integrates with the surrounding soft tissue.

Vertiprep is closely linked to BOPT (Biologically Oriented Preparation Technique). This approach builds on vertical preparation by shaping gingival tissue and controlling the emergence profile through preparation and provisional restorations. That means the restoration does not simply fit the tissue. The tissue adapts to the restoration.

Vertical tooth preparation offers an alternative to traditional crown preparation. It typically preserves more of the natural tooth structure and allows the margin to be positioned in relation to the gingival tissue. But successful outcomes depend on careful case selection, precise execution, and clear coordination with the dental laboratory.

How Traditional Crown Prep Works and Why It Has Limitations

Traditional crown preparation relies on a clearly defined finish line. This is typically created as a shoulder or chamfer around the tooth, which provides a stable and visible margin for the restoration to seat against.

To create this defined margin, a measurable amount of tooth structure must be removed. This reduction creates space for restorative materials, but it also introduces biological and mechanical considerations.

Despite these limitations, traditional preparation methods remain widely used. Shoulder and chamfer designs support a broad range of materials and clinical situations. There is no single preparation method that is recommended in all cases. The choice depends on multiple factors, including tooth condition, material selection, and clinical objectives.

What is Vertical Tooth Preparation

Vertical tooth preparation is a technique used to prepare teeth for crowns or veneers without creating a defined horizontal margin. Instead of forming a shoulder or chamfer, the tooth is shaped with a vertical finish line that extends along the axial walls.

This approach is often described as shoulderless crown preparation. It may also be referred to as feather edge or knife edge preparation, depending on how the margin is formed. In each case, the preparation does not include a fixed finish line that can be clearly identified on the tooth surface.

The preparation typically extends into the subgingival area. This allows the crown margin to be positioned in relation to the gingival tissue rather than a predefined edge. As a result, the final location of the margin is influenced by the shape and position of the surrounding soft tissue.

The laboratory typically plays a more active role in defining the final margin. The technician positions the crown margin based on the information captured from the gingival tissue in the impression or digital scan. This requires accurate data capture and clear communication between the dentist and the laboratory.

Vertical Tooth Preparation Workflow

1. Patient evaluation – A thorough clinical and periodontal assessment is carried out to confirm that vertical tooth preparation is appropriate for the specific case.
   
2. Minimal tooth reduction – The tooth is reduced conservatively, with the aim of removing only the structure necessary to allow space for the restoration.
   
3. Vertical margin creation – A vertical finish line is created using fine instruments, without forming a shoulder or chamfer, to maintain a continuous axial surface.
   
4. Subgingival extension and tissue management – The preparation extends into the sulcus, and soft tissue is managed using techniques such as retraction to ensure clear access and visibility.
   
5. Impression or digital scan – A precise impression or digital scan is taken to capture the vertical margins and surrounding gingival structure for accurate restoration design.
   
6. Temporary restoration – A temporary crown may be placed to protect the tooth and maintain tissue stability while the final restoration is being fabricated.
   
7. Final restoration placement – The definitive crown is fitted and bonded, ensuring proper adaptation to the prepared tooth and surrounding tissue.

What is BOPT (Biologically Orientated Preparation Technique)?

The BOPT technique in dentistry is a specific approach within vertical tooth preparation. It focuses on the biological response of the surrounding tissue during crown preparation.

A key feature of BOPT is its interaction with soft tissue. The preparation process involves controlled disruption of the gingival tissue, which initiates a biological response. This response leads to changes in tissue thickness and contour as healing occurs around the restoration.

This approach allows the gingival tissue to adapt to the restoration rather than the restoration adapting to a fixed margin. It requires precise execution and careful coordination between the dentist and the laboratory to achieve a stable and predictable outcome.

BOPT Tissue Response Purpose

1. Preparation into sulcus – Preparation extends into the gingival sulcus to remove the existing anatomical reference point and create space for a new prosthetic interface.
   
2. Removal of CEJ convexity – The cemento-enamel junction convexity is removed to allow the formation of a new prosthetic junction controlled by the restoration.
   
3. Gingival disruption – The preparation causes controlled disruption of the gingival tissue, which initiates a healing response.
   
4. Blood clot formation – A blood clot forms within the sulcus and serves as the foundation for tissue regeneration and adaptation.
   
5. Provisional stabilisation – The provisional restoration stabilises the clot and helps guide the healing process.
   
6. Tissue thickening – As healing progresses, the gingival tissue increases in thickness and adapts to the new contours.
   
7. Emergence profile established – The final crown supports a new emergence profile that reflects the adapted gingival architecture.

Key Benefits of Vertiprep and BOPT 

Vertiprep dental crown preparation and BOPT are associated with a more conservative and tissue-responsive approach to crown preparation, particularly in cases where preserving tooth structure, managing soft tissue, and achieving a stable emergence profile are key clinical objectives.

• Tooth preservation: Vertical tooth preparation typically removes less tooth structure than shoulder or chamfer designs, which helps maintain natural tooth integrity.
• Reduced dentine exposure: Less reduction limits dentine exposure, which is linked to lower post-treatment sensitivity in some cases.
• Aesthetic integration: The crown margin is positioned in relation to the gingival tissue, which supports a smoother transition and can reduce visible margins.
• Emergence profile control: Vertical preparation allows adjustment of the emergence profile to align with gingival contours.
• Gingival adaptation (BOPT): Tissue thickness and contour can change during healing around provisional restorations, which may support a more stable gingival margin.
• Periodontal response: The absence of a defined horizontal margin reduces abrupt transitions at the tooth-restoration interface, which can help minimise irritation in some cases.
• Application in compromised teeth: The conservative nature of the technique may make it suitable for teeth with reduced structure in selected cases.

Vertiprep vs Chamfer Preparation

Traditional chamfer preparation uses a clearly defined finish line. This is typically created as a shoulder or chamfer, which provides a visible and stable margin for the restoration. The margin is determined during preparation and transferred directly to the laboratory through the scan or impression.

Vertical tooth preparation takes a different approach. There is no fixed finish line. The margin is not defined on the tooth in the same way. Instead, the final position of the crown margin is determined in relation to the gingival tissue and interpreted during the laboratory stage.

This difference affects how much tooth structure is removed. Vertical preparation is designed to minimise reduction, while traditional methods tend to require more removal to create space for the restoration and define the margin.

It also changes how the restoration interacts with soft tissue. Vertical preparation allows the margin to sit in relation to the gingiva, which can support a smoother transition. 

There is no single preparation method that is suitable for every case. The choice depends on clinical objectives, material requirements, and the condition of the tooth.

Who is a Good Candidate for Vertiprep?

Vertiprep dental crown preparation is most appropriate in cases where preserving tooth structure and managing soft tissue are key clinical priorities, particularly when the condition of the tooth or the aesthetic requirement makes traditional preparation less suitable.

Patients who meet the following criteria may be a good candidate for Vertiprep:

• Worn teeth: Vertical tooth preparation is suitable for teeth with significant wear, where minimal reduction helps restore function without further weakening the structure.
  
• Aesthetic anterior cases: In visible areas, vertical preparation supports a smoother transition between the crown and gingiva, which can improve the visual integration of the restoration.
  
• Compromised tooth structure: Teeth affected by decay, fractures, or previous restorations may benefit from a conservative approach that preserves remaining structure.
• Periodontal considerations: Vertical preparation may be used in cases where maintaining or improving gingival response is important, particularly where subgingival margins can be managed effectively.

What Crown Materials Work Best for Vertiprep?

Material selection in Vertiprep dental crown preparation requires careful consideration. Vertical tooth preparation creates thin margins, which can introduce higher stress concentrations compared to other margin designs. This means the suitability of each material depends on how it performs under these conditions, rather than a single material being appropriate in all cases.

The Role of Digital Scanning and Impressions

Digital scanning and impression accuracy play a critical role in Vertiprep dental crown workflows, because vertical tooth preparation removes the clearly defined finish line and shifts margin definition into the soft tissue, which increases the importance of capturing both the prepared tooth and the surrounding gingival structure accurately.

• No defined margin to capture: Vertical tooth preparation does not create a visible finish line, so the impression must record the relationship between the tooth and gingival tissue rather than a fixed edge.
  
• Higher reliance on soft tissue detail: The position of the final crown margin depends on gingival contours, which means soft tissue capture becomes as important as the tooth preparation itself.
  
• Subgingival margin challenges: Margins that extend into the sulcus are more difficult to record, particularly when access or visibility is limited.
  
• PTFE-assisted margin definition: PTFE tape can be placed within the sulcus to define margin depth and improve consistency in both analogue and digital impressions.
  
• Laboratory collaboration: The technician relies on the quality of the scan or impression and the information provided to determine the final margin position.
  

FAQs: Your Vertiprep Questions Answered

What is Vertiprep dental drown preparation?

Vertiprep dental crown preparation is a form of vertical tooth preparation that does not use a defined finish line. The crown margin is determined in relation to the gingival tissue rather than a fixed edge on the tooth. This approach focuses on preserving tooth structure while supporting soft tissue adaptation.

What is BOPT technique in dentistry?

The BOPT technique in dentistry is a variation of vertical tooth preparation that focuses on the biological response of gingival tissue. It involves preparation into the sulcus and uses provisional restorations to guide tissue healing, thickness, and contour, which helps define the final emergence profile of the crown.

Is vertical tooth preparation minimally invasive?  

Vertical tooth preparation is considered a minimally invasive crown preparation approach in appropriate cases. It typically removes less tooth structure than traditional shoulder or chamfer designs, which helps preserve the natural tooth and may reduce post-treatment sensitivity in some situations.

Is Vertiprep better than chamfer preparation?  

Vertiprep vs chamfer preparation is not a matter of one method being better in all cases. Each approach has different indications, advantages, and limitations. The choice depends on factors such as tooth condition, material selection, and clinical objectives.

Conclusion

Vertiprep dental crown preparation and the BOPT technique in dentistry offer a different approach to crown design. Vertical tooth preparation removes the defined finish line and allows the crown margin to be positioned in relation to the gingival tissue. This creates a more conservative method that preserves tooth structure and introduces a greater focus on soft tissue interaction.

But these techniques are not universally applicable. They require careful case selection, precise execution, and accurate communication between the dentist and the laboratory. The absence of a fixed margin changes how impressions are taken, how restorations are designed, and how outcomes are achieved.

Traditional preparation methods remain widely used and continue to support a broad range of clinical situations. Vertical tooth preparation provides an alternative where conservation of structure and management of gingival tissue are priorities.

Avant Dental is a full-service dental laboratory. To find out more about working with us, please email [email protected] or phone 1800 287 336.