Short answer

When designing or manufacturing dental prosthetics, prioritize milled zirconia for optimal fit and consider using scanned workflows for improved accuracy.

Field: Final Production
Source: Egyptian Dental Journal /Egyptian Dental Journal (2022)
Method: Experimental
Sample: 30 crowns
Evidence: Strong effect

The study found that milled zirconia prosthetics exhibit significantly smaller marginal and internal gaps compared to those made from lithium disilicate or PEKK, indicating a better fit and potentially higher durability. This final production research insight is drawn from a 2022 study published in Egyptian Dental Journal /Egyptian Dental Journal. Using Experimental with 30 crowns, researchers explored how this design variable affects real-world outcomes. The key design takeaway: When designing or manufacturing dental prosthetics, prioritize milled zirconia for optimal fit and consider using scanned workflows for improved accuracy.

Study

Final ProductionHigh ImpactStrong effect

Milled Zirconia Demonstrates Superior Internal and Marginal Fit in Dental Prosthetics

Egyptian Dental Journal /Egyptian Dental Journal · 2022

Key Findings

01The scanned abutment group (Group II) showed lower mean marginal (71.55 µm) and internal gaps (94.66 µm) compared to the split-file group (Group I: 85.44 µm and 103.73 µm).
02Zirconia exhibited the best marginal and internal adaptation (69.27 µm and 82.48 µm), followed by PEKK (82.14 µm and 105.4 µm), and then lithium disilicate (84.08 µm and 109.7 µm).

Application

Design takeaway

When designing or manufacturing dental prosthetics, prioritize milled zirconia for optimal fit and consider using scanned workflows for improved accuracy.

How to apply

When selecting materials for a prosthetic design, research their known precision in manufacturing processes. For example, if a tight tolerance is required, a material known for its high accuracy in milling, like zirconia, would be preferred.

Project actions

01Investigate the material properties of different polymers or ceramics for a product where precise fit is essential.
02Compare different digital manufacturing methods (e.g., 3D printing vs. CNC milling) for their accuracy and material waste.

Method & Evidence

AimTo compare the marginal and internal adaptation of non-metallic implant-supported crowns fabricated using split-file versus scanned workflows, and to evaluate the influence of different materials (zirconia, lithium disilicate, PEKK) on this adaptation.

MethodExperimental

ProcedureThirty crowns were fabricated and divided into two groups: one using a split-file workflow and the other a scanned workflow. Each group was further divided based on material (zirconia, lithium disilicate, PEKK). Marginal and internal adaptation were measured using a replica technique and a digital microscope.

Sample30 crowns

ContextDental prosthetics manufacturing

Variables

IV["Manufacturing workflow (split-file vs. scanned)","Material type (zirconia, lithium disilicate, PEKK)"]

DV["Marginal gap","Internal gap"]

CV["Abutment material (zirconia)","Crown fabrication method (milling/digital)","Measurement technique (replica, digital microscope)"]

Strengths & Limitations

Strengths

+Direct comparison of two distinct digital workflows.
+Evaluation of multiple relevant materials used in dental prosthetics.

Limitations

This study used dental crowns, which are highly specialized. Applying these findings directly to simpler products might be an oversimplification. The study did not consider the long-term wear or failure rates of the different materials.

Reliability & validity

The use of a replica technique and digital microscope enhances the reliability and validity of the gap measurements. However, the study's focus on a specific clinical context might limit its generalizability. The sample size of 10 per subgroup is moderate.

Think critically

While zirconia showed the best fit, were there other factors (e.g., cost, aesthetics, ease of processing) that might make lithium disilicate or PEKK a more suitable choice in certain applications?

Design Principles

"Material properties significantly influence manufacturing precision and product performance."

This research is crucial for understanding how material choice directly impacts the precision of manufactured dental prosthetics. For design, it highlights the importance of material properties in achieving high-quality, functional outcomes in complex manufacturing processes.

What This Means for Your Design

Using zirconia to make fake teeth (crowns) makes them fit better than using other materials like lithium disilicate or PEKK. Also, a newer way of scanning the teeth before making the crown leads to a better fit.

How to use in your project

1.Use this to justify the selection of a specific material or manufacturing process for your prototype, citing the improved fit and potential for better performance.
2.If your project involves digital design and fabrication, this study can inform your choice of software or hardware based on their reported accuracy.

Add to My Project

Quick Cite

Paragraph starter

The selection of materials in manufacturing significantly impacts the precision of the final product. Research by Elbanna and Alqutub (2022) demonstrated that milled zirconia prosthetics exhibit superior marginal and internal adaptation compared to lithium disilicate and PEKK, with scanned workflows yielding better fit than split-file methods. This highlights the importance of material properties and digital workflow choices in achieving high-tolerance outcomes, a critical consideration for any product requiring precise assembly or function.

Source

Egyptian Dental Journal /Egyptian Dental Journal

Internal Adaptation and Marginal Gap of Split-File Versus Scanned Workflows of Three Types of Non-Metallic Super-Structures on Zirconia Abutments

journal · 2022

View source

Questions About This Research

What does the research say about milled zirconia demonstrates superior internal and marginal fit in dental prosthetics?: When designing or manufacturing dental prosthetics, prioritize milled zirconia for optimal fit and consider using scanned workflows for improved accuracy. Evidence: Egyptian Dental Journal /Egyptian Dental Journal (2022).
Why does "Milled Zirconia Demonstrates Superior Internal and Marginal Fit in Dental Prosthetics" matter for design?: This research is crucial for understanding how material choice directly impacts the precision of manufactured dental prosthetics. For IB DT, it highlights the importance of material properties in achieving high-quality, functional outcomes in complex manufacturing processes.
How can designers apply this research?: When designing or manufacturing dental prosthetics, prioritize milled zirconia for optimal fit and consider using scanned workflows for improved accuracy.
What were the main findings?: The scanned abutment group (Group II) showed lower mean marginal (71.55 µm) and internal gaps (94.66 µm) compared to the split-file group (Group I: 85.44 µm and 103.73 µm).. Zirconia exhibited the best marginal and internal adaptation (69.27 µm and 82.48 µm), followed by PEKK (82.14 µm and 105.4 µm), and then lithium disilicate (84.08 µm and 109.7 µm).
What research method was used?: Experimental with 30 crowns.
How strong is the evidence?: Evidence strength is rated Strong effect, based on a 2022 journal from Egyptian Dental Journal /Egyptian Dental Journal.
What should I do differently in my next project?: When selecting materials for a prosthetic design, research their known precision in manufacturing processes. For example, if a tight tolerance is required, a material known for its high accuracy in milling, like zirconia, would be preferred.
What are the limitations?: The study focused on specific non-metallic super-structures and zirconia abutments; results may vary with different materials or abutment types. The 'acceptable' threshold for gaps was not explicitly defined beyond the study's findings.