What are the Material Types of Dental Implants, and What Are the Pros and Cons of Each?

What is a Dental Implant?

The implant is the part inserted into the jawbone in dental implantation, making it the only material implanted into the human body in the entire process. Therefore, the selection of implant materials is crucial. Implant materials should be non-toxic, non-allergenic, non-carcinogenic, with excellent biocompatibility, corrosion resistance, wear resistance, and superior mechanical properties.

So, what are the materials for dental implants, abutments, and crowns, and how should one choose?

Titanium and Alloy

Since Branemark proposed the osseointegration theory, pure titanium and titanium alloys have been the preferred materials for oral implants. Research has shown that pure titanium exhibits excellent biocompatibility and corrosion resistance, along with superior mechanical properties, including hardness, tensile strength, yield strength, and fatigue strength. These properties meet the functional demands of oral implants, leading to widespread clinical application and achieving favorable restorative outcomes.

However, drawbacks exist. Despite the clinical application of pure titanium and titanium alloy implants, certain limitations persist. The high strength of these metals and alloys comes with a relatively large elastic modulus, leading to the phenomenon of stress shielding.

Ceramic Materials

Ceramic dental implants, primarily composed of materials such as zirconia, offer an aesthetic appeal with colors closely resembling natural teeth. Renowned for their excellent biocompatibility, scholars have been exploring their clinical application as implant materials. These materials exhibit high mechanical strength, corrosion resistance, and compatibility with tissues, along with being non-irritating and non-toxic.

However, drawbacks persist: Long-term clinical data for ceramic materials like zirconia remain limited, and issues such as wear, crystalline degradation, crack propagation, and brittle fracture as dental implant materials still spark debates.

Polymeric Materials

Polymeric materials mainly include polytetrafluoroethylene, acrylic esters, etc. This type of material is susceptible to aging and degradation in bodily fluids, potentially generating substances that may be irritating to the organism. The long-term effects of prolonged implantation in the human body remain a subject of debate. Currently, there is a consensus that combining the excellent properties of metal with dental implant materials and coating the surface with biocompatible materials can ensure both the precision and strength of the implant while maintaining favorable biocompatibility. This approach holds promising prospects for research and application.

So, how should one choose the appropriate dental implant? Which material is the best? The selection of dental implants involves considering various factors such as the mechanical performance of the implant and the biocompatibility of the material. Through a comparison of the three types of implant materials mentioned above, titanium emerges as the superior material choice.

Pure titanium, a lightweight metal, possesses a low elastic modulus, providing substantial dampening of vibrations. It exhibits high hardness, ultimate tensile strength, yield strength, and fatigue strength. Additionally, it demonstrates excellent corrosion resistance and a high fatigue limit. Titanium's passivation ability is outstanding, rapidly oxidizing in body fluids to form a thin, dense, and insoluble crystalline structure oxide layer (TiO2) on its surface. Due to the protective nature of this oxide layer, the rate of continued oxidation slows down, imparting excellent corrosion resistance, biocompatibility, and biomechanical adaptability in contact with the human body.