Grade 23 Titanium vs Grade 5 Titanium Implants
Think of two athletes: one is incredibly strong, while the other is strong and extra flexible. Titanium implants work the same way. Different grades have different strengths, toughness levels, and responses to stress. For example, Grade 23 titanium (Ti-6Al-4V ELI) has a minimum tensile strength of approximately 860 MPa, according to ASTM F136 specifications.
In this guide, we compare Grade 23 Titanium vs Grade 5 Titanium Implants, breaking down what sets each alloy apart, when each one performs best, and how these differences affect healing, comfort, and stability over time. If you are trying to cut through confusing marketing claims and find real answers, this article gives you the clarity you have been looking for.
Parlay Implants manufactures both Grade 5 and Grade 23 titanium implant solutions with precision-engineered strength, biocompatibility, and reliability tailored to every clinical requirement.
What Are Titanium Grade 5 and Grade 23 in Dental Implants?
Understanding these two titanium alloys is essential because the material inside an implant directly affects its strength, safety, long-term stability, and suitability for different bone conditions. Titanium remains the leading choice in implantology due to its:
- Exceptional biocompatibility, supporting predictable osseointegration
- Outstanding corrosion resistance, even in saliva-exposed environments
- Ability to form a strong bone–implant interface, critical for long-term implant survival
- Favorable mechanical properties, allowing implants to withstand years of functional loading
These benefits make titanium alloys, mainly Grade 5 and Grade 23, vital in modern dental implant design.
Titanium Grade 5 (Ti-6Al-4V)
Grade 5 is the main alloy used in the implant industry. It is chosen for its high durability and strong mechanical performance. It offers:
- High tensile and yield strength, ideal for full-size implant bodies
- Superior fatigue resistance under heavy occlusal forces
- Reliable corrosion stability for long-term intraoral use
- Proven performance in load-bearing restorations, such as molar and full-arch cases
Grade 5 is often chosen for its strength and rigidity. Clinicians prefer it when they need reliable stability in dense bone or high-load areas at the back.
Titanium Grade 23 (Ti-6Al-4V-ELI)
Grade 23 is a “refined” version of Grade 5. It has extra-low interstitial elements (ELI), which leads to better purity and biological compatibility. Its clinical advantages include:
- Higher ductility and flexibility reduce the risk of fracture in narrow implants
- Improved toughness, ideal for thin ridges or areas with limited bone
- Lower oxygen and iron content, which enhances soft-tissue response and safety
- Better performance in anatomically challenging sites, including anterior aesthetic zones
Grade 23 (Ti-6Al-4V ELI) has a maximum oxygen content of just 0.13%, which is significantly lower than many other titanium alloys. This low impurity level helps improve its fracture toughness and biocompatibility in dental implantation.
Why the Difference Matters Clinically
Both alloys belong to the titanium family. However, their differences guide how implant makers design parts and how clinicians choose them. In real practice:
- Grade 5 = Strength and load-bearing reliability
- Grade 23 = Safety, flexibility, and performance in delicate anatomy
These distinct advantages help dental professionals match implant materials to bone quality, case complexity, and long-term biomechanical needs. This ensures more predictable treatment outcomes.
What Are the Key Differences Between Titanium Grade 5 and Grade 23?
Grade 5 and Grade 23 both use the same alloy base, Ti-6Al-4V. However, they behave very differently under stress, during machining, and in biological conditions. These differences directly influence implant longevity, fracture risk, abutment performance, and overall clinical predictability. Clinicians need to know how each grade performs. This is essential when choosing implants for tough bone conditions, narrow-diameter fixtures, or thin-walled parts.
Composition and Purity Differences
Both grades belong to the Ti-6Al-4V alloy family, but the ELI (extra-Low Interstitial) specification of Grade 23 means:
- Lower oxygen content
- Reduced nitrogen and carbon impurities
- Higher ductility and fracture toughness
This “cleaner” alloy gives Grade 23 a mechanical advantage in situations where implants face repeated microstrain, such as the crestal region or in poor-quality bone (D3–D4). The enhanced toughness reduces the likelihood of microfractures, component deformation, or sudden failure.
Grade 5 is stiffer and stronger, making it perfect for situations needing high rigidity. It’s often used in wider implants or strong abutment parts.
Mechanical Strength and Flexibility Comparison
When comparing Grade 5 Titanium (Ti-6Al-4V) and Grade 23 Titanium (Ti-6Al-4V ELI) for dental implants, the main difference is not just the numbers. It’s how each alloy performs in the mouth over years of biting, small movements, and repeated stress. Both materials perform excellently. Yet, their mechanical profiles make them ideal for different implant designs and clinical needs.
Core Mechanical Property Comparison
Property | Grade 5 Titanium (Ti-6Al-4V) | Grade 23 Titanium (Ti-6Al-4V ELI) |
Tensile Strength | Higher | Slightly lower |
Yield Strength | Higher | Lower |
Ductility | Moderate | Higher (more flexible, less brittle) |
Fatigue Resistance | High | Very High (best for cyclic loading) |
Modulus of Elasticity | Similar | Similar |
According to ASTM F136, the modulus of elasticity for Grade 23 titanium is 105–120 GPa. That is nearly the same stiffness as Grade 5, but Grade 23 achieves this with better ductility and toughness. The key difference is not raw strength, but fatigue behaviour. Grade 23 is more ductile and tough. This helps it resist repetitive forces without cracking. This quality is especially important for:
- Narrow-diameter implants
- Implants used in posterior regions with a high occlusal load
- Long-term microstrain at the crestal bone level
- Thin-walled implant designs
Grade 5 is the stronger alloy on paper. However, its lower ductility means it is less forgiving in cases where implants flex often under load.
Biocompatibility and Clinical Behaviour Differences
Both grades are very biocompatible. However, Grade 23 usually shows a better biological response because it has fewer impurities. Clinically, this can support:
- Better osseointegration consistency
- Lower risk of microfracture in compromised bone
- Safer use in delicate or narrow implant designs
Grade 5 continues to dominate in abutments, prosthetic components, and standard-diameter implant bodies. In these cases, strength and stiffness are prioritised over flexibility. In ASTM F136-certified Grade 23, elongation at break is at least 10%, showing it deforms more before failing. This high elongation supports safer performance in narrow or delicate implants, reducing the risk of cracks.
Why Are Grade 5 and Grade 23 Titanium Considered Ideal for Dental Implants?
Dental implants can no longer withstand mere biting forces. They undergo recurrent microstrain, multidirectional loading, change in temperature, and biologically active environment. Titanium Grade 5 and Grade 23 both satisfy all these requirements and that is why they are the standard in contemporary implant systems.
These alloys are unique in the sense that they are strong, tough and biocompatible.
- The implants and abutments are able to retain their shape despite the heavy loads on their occlusal surface due to their high tensile and yield strength.
- Grade 23 has great fatigue resistance. This means implants can handle millions of chewing cycles without getting microfractures.
- Great corrosion resistance means long-term stability in the mouth. Saliva, pH changes, and bacteria can harm weaker materials.
These mechanical advantages help ensure predictable osseointegration. This allows the bone to create a direct and lasting bond with the implant surface. Both alloys work well with modern surface treatments like SLA, SLActive, and anodised textures. These treatments help improve bone response and boost early stability.
Grades 5 and 23 are stronger and more durable than commercially pure titanium. They offer better strength without affecting healing results. Grade 23 has an extra-low interstitial (ELI) composition. This gives it better ductility. So, it’s perfect for narrow implants, thin-walled designs, and situations with soft or compromised bone. Grade 5 is the standard for prosthetic parts, big fixtures, and strong implant designs.
These alloys are essential for many dental treatments. They work well for a single missing tooth, an implant-retained bridge, or a full-arch restoration. Clinicians rely on them for their strength, compatibility with the body, and long-lasting results.
We help you meet your clinical goals with our prosthetic parts. They work well with Grade 5 or Grade 23 implants, ensuring both precision and durability.
When Should Grade 5 vs Grade 23 Titanium Be Used in Clinical Applications?
Not every clinical scenario is the same and the clinical indications for implant materials matter. A material that is too rigid might fracture under unexpected stress, while a material that is too soft may deform. Choosing the right alloy depends on the clinical needs, bone quality, and expected prosthetic load.
Situations Where Grade 23 Performs Better
Grade 23 excels in:
- Narrow-diameter implants
- Immediate implant placements
- Delicate bone (D3–D4)
- High-flexibility requirements
- Areas prone to stress-induced fractures
Its strong toughness lowers the chance of implant fracture. This is key for implant fatigue performance.
Cases Where Grade 5 Provides Superior Results
Grade 5 is often the preferred choice when:
- High bite forces are expected
- Implants have wider diameters
- Prosthetic loads are heavier
- Angulated implants need stiff support
- Enhanced rigidity is necessary
Grade 5 is a popular choice for posterior restorations. It influences tensile strength and ensures high compressive stability.
Clinicians must check bone density, patient habits, and mechanical load before choosing between the two.
If you work with narrow spaces or delicate anatomy, our Grade 23 narrow-diameter implants are ideal.
How Do Cost, Durability, and Long-Term Performance Differ Between the Two Grades?
Cost and long-term reliability play major roles in implant decisions. Both metals offer strong, predictable results. Still, their differences affect patient outcomes, manufacturing costs, and implant longevity.
Manufacturing Costs and Market Pricing
Grade 23, due to its purification process, is slightly more expensive to produce. The extra refining steps increase costs but also enhance ductility and toughness. Grade 5 is more affordable and widely used, making it the go-to choice for many implant manufacturers.
Longevity and Failure Rate Comparisons
Both grades show high survival rates in long-term studies. Grade 23 may help reduce the risk of microfractures and fatigue failures, especially in thin implants. The fatigue strength (10⁷ cycles) of Grade 23 titanium reaches 590–670 MPa. Grade 23 has high fatigue resistance. This helps it handle repeated chewing cycles better, which is important for implant longevity.
Key durability factors include:
- Corrosion resistance
- Structural rigidity
- Surface treatment synergy
- Resistance to bending loads
- Cyclic fatigue behavior
Grade 5 is incredibly durable but may fracture earlier under extreme cyclic pressure compared to Grade 23.
We design our products to ensure excellent long-term reliability. This is done in ISO 13485-certified facilities with FDA and CE-certified processes.
Final Thoughts
The decision between Grade 5 and Grade 23 titanium implants depends on the purpose used clinically, the anatomy of the patient, and the duration the patient requires the implant. Grade 5 is highly inflexible and tough whereas Grade 23 is cleaner and flexible with a higher ability to support repetitive stress. Each alloy is suitable for particular surgical scenarios.
When selected appropriately, both materials support reliable, long-lasting implant outcomes with excellent biocompatibility, strong corrosion resistance, and high fatigue tolerance. This allows surgeons to always have good predictability and success by evaluating the level of activity in a particular patient and the quality of bones.
Parlay Implants provides Grade 5 and Grade 23 titanium, which provides precision-engineered performance to meet a large variety of clinical requirements.
FAQs
1. What is the difference between Grade 5 and Grade 23 titanium?
Grade 23 and Grade 5 are mainly differentiated in terms of purity and interstitial contents. It is less interstitial and therefore more ductile and tough. Grade 5 provides greater strength and rigidity.
2. Is titanium Grade 23 good?
Grade 23 is an ideal dental implant, particularly in situations where the implant site is limited or fragile. It is more flexible and clean and thus safer to patients with sensitive biology.
3. What is the best grade of titanium for dental implants?
In the majority of standard implants, Grade 5 is the preferred material due to its excessive strength. Grade 23 tends to be more appropriate in case the implant is narrow, highly esthetic, or in a difficult position. Finally, the grade depends on the clinical situation.
4. Is Grade 2 titanium better than Grade 5?
No, Grade 2 is less rigid but also weaker hence is not mostly used in supporting the implant bodies which require long term loading. Grade 5 offers the required strength and endurance.