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Effect of Split-File Digital Workflow on Crown Margin Adaptation.

Ryan R Sheridan^1,2, Ronald Verrett², Stephan Haney²

¹Prosthodontics Residency, Air Force Postgraduate Dental School, Uniformed Services University of the Health Sciences, Lackland AFB, TX.

Journal of Prosthodontics : Official Journal of the American College of Prosthodontists

|June 10, 2017

Summary

This summary is machine-generated.

The complete digital split-file protocol for dental restorations resulted in larger marginal gaps compared to segmental digital and analog techniques. Adjustments were needed for 52 restorations to achieve proper contours.

Keywords:

CAD/CAM custom abutment marginal gap prosthodontics virtual design

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Digital Hybrid Model Preparation for Virtual Planning of Reconstructive Dentoalveolar Surgical Procedures

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Published on: August 5, 2021

Area of Science:

Dental materials science
Digital dentistry
Prosthodontics

Background:

Computer-aided design/computer-aided manufacturing (CAD/CAM) integration in dentistry is advancing rapidly.
Scientific validation of new CAD/CAM protocols, such as the complete digital split-file approach, is crucial for clinical adoption.

Purpose of the Study:

To evaluate a complete digital split-file protocol against segmental digital and analog techniques for restoring maxillary anterior edentulous spaces.
To compare the marginal gap accuracy of custom abutments and crowns fabricated using different digital and analog workflows.

Main Methods:

Four workflows were assessed: complete digital (CD), segmental digital (SD), milled wax (AM), and heat pressed/hand waxed (AH).
The CD workflow involved separate abutment and crown files for zirconia abutments and zirconia/lithium disilicate crowns.
Restorations were evaluated for marginal gap using scanning electron microscopy (SEM) before and after adjustments, with adjustments recorded.

Main Results:

The complete digital (CD) workflow showed a statistically significant larger mean marginal gap (69 μm) compared to SD (26 μm), AM (32 μm), and AH (26 μm) groups after adjustment.
The segmental digital (SD), milled wax (AM), and heat pressed/hand waxed (AH) workflows demonstrated statistically similar marginal gap results.
52 out of 60 digitally produced restorations in the CD group required adjustments for horizontal marginal offset to achieve proper contours.

Conclusions:

While the complete digital split-file protocol yields marginal gap sizes within clinical standards after adjustment, it necessitates significant contour adjustments.
Segmental digital and analog techniques provided comparable and smaller marginal gap results than the complete digital split-file protocol in this study.
Further refinement of the complete digital split-file protocol may be needed to minimize contour discrepancies and adjustment requirements.