Digital workflow integration for chairside restorative planning and fabricated zirconia crowns: a CAD/CAM approach for enhanced marginal fit and longevity

Project Abstract

The abstract presents a comprehensive evaluation of an integrated digital workflow for chairside restorative planning and the fabrication of zirconia crowns using CAD/CAM technology, aimed at improving marginal fit, occlusal harmony, and longevity of posterior and anterior restorations. This study investigates the end-to-end process from digital impression acquisition, through virtual planning and design, to chairside milling and immediate restoration cementation, emphasizing streamlined communication among clinicians, dental technicians, and material scientists. A mixed-methods design was employed, combining quantitative metrics of marginal gap, internal fit, fracture resistance, durability under cyclic loading, and wear against opposing dentition with qualitative assessments from operator feedback, patient satisfaction, and workflow efficiency. Digital impressions obtained via intraoral scanners were compared with conventional pours to evaluate accuracy and repeatability. Virtual planning modules integrated crown morphology, occlusal schemes, and margin design, followed by CAD-driven optimization of connector geometry and marginal fidelity. Zirconia crowns were milled using high-precision CAD/CAM equipment with optimized sintering protocols to preserve chairside viability and reduce processing time. A subset of restorations utilized monolithic zirconia with layered veneering to assess esthetic outcomes and fracture resistance under thermal-mechanical cycling. Finite element analysis complemented the experimental data to predict stress distribution under functional loads and identify critical design parameters for minimizing crack initiation and propagation. Clinical outcomes were tracked over 12 to 24 months, focusing on marginal integrity, chipping rate, secondary caries incidence, postoperative sensitivity, and revised fit following clinical adjustment. The study also evaluated the impact of digital workflows on chairside time, patient comfort, and overall treatment cost, comparing traditional laboratory-supported workflows with the fully integrated CAD/CAM approach. Statistical analyses included paired and unpaired tests for fit metrics, Kaplan-Meier survival analyses for restoration longevity, and multivariate regression to determine predictors of clinical success. The findings demonstrated that digital workflow integration significantly improved marginal gaps to sub-100 micrometer ranges in most cases, with enhanced fit consistency across anterior and posterior teeth. Monolithic zirconia crowns exhibited superior fracture resistance and favorable long-term wear characteristics, while anatomically contoured designs maintained esthetics without compromising structural integrity. The research identifies critical factors influencing success, including scanner accuracy, margin design strategies, optimization of sintering cycles, and the balance between occlusal morphology and material toughness. Potential limitations are noted, such as learning curves for clinicians and material-specific constraints on shade matching. The study contributes evidence supporting the routine adoption of chairside CAD/CAM pathways for zirconia restorations, highlighting improvements in clinical efficiency, restoration longevity, and patient satisfaction, while outlining best-practice guidelines for implementation in general and specialty dental practices.

Project Overview

What This Project Is About

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A plain-language overview of the topic and what the project investigates.

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The Problem It Addresses

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What problem or gap this project tackles and why it matters to the field or society.

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Objectives of the Project

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1. Understand digital workflows used in chairside planning.
2. Compare traditional crowns with CAD/CAM-fabricated zirconia crowns in fit and durability.
3. Assess user-friendly steps for clinicians and students in the workflow.

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What You Will Do Step by Step

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1. Review basic concepts of CAD/CAM dentistry and zirconia materials.

2. Observe and document a chairside workflow from scanning to milling and seating.

3. Collect data on marginal fit, accuracy, and time efficiency for sample cases.

4. Analyze results to identify advantages and limitations of the digital workflow.

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Expected Outcome

Clear understanding of how digital planning improves crown fit and longevity, with practical tips for adoption in practice.