Zirconia abutments are widely used in dental implants because they are strong, durable, and look natural. They have greatly improved implant aesthetics, especially in visible areas. Zirconia abutments almost never chip in normal clinical use; however, chipping can sometimes occur in the crown or porcelain layered on top of implant restorations. What chips are veneering porcelain, implant crowns, and on rare occasions, thin zirconia restorations.
This blog explains the most common causes of zirconia abutment chipping and how we can reduce failures for long-term success.
Manufacturing and Material Issues
One major cause of chipping begins during manufacturing. Zirconia abutments are often milled using CAD/CAM technology. Errors during manufacturing or design can weaken restorations in ways that aren't immediately visible.
In layered designs, if the porcelain layer (usually on crowns, not abutments) is too thin, it can chip easily under pressure. Modern implants often use monolithic zirconia. These problems may not be visible at first, but can show up after the abutment is placed and in use.
Bite Pressure and Occlusal Forces
Since implants do not have the same shock-absorbing ability as natural teeth, strong bite forces are one of the most common reasons crowns chip. Patients who grind or clench their teeth place extra stress on implant restorations. Over time, this repeated pressure can cause small cracks that turn into visible chips.
Poor Material Compatibility
Chipping can also happen when the materials used do not work well together. Different materials expand differently with heat, which can slowly weaken the porcelain. Zirconia and the porcelain placed on top of it react differently to heat. When they expand and shrink at different rates, stress builds up inside the restoration. Over time, this stress can cause the porcelain to chip.
Poor finishing techniques can make the problem worse.Improper adjustment or finishing can weaken the surface if not done carefully. While these flaws may not be visible, they weaken the material and increase the risk of chipping later on.
Design and Thickness Problems
If the abutment or crown is too thin, especially in the back teeth, it becomes more likely to chip. Sharp angles and poor transitions can also put extra stress on the abutment, causing it to chip.
In screw-retained restorations, thin areas around edges or screw openings are more vulnerable.
Clinical and Patient-Related Factors
Patient-related factors can also raise the risk of chipping. Teeth grinding or clenching puts constant pressure on zirconia abutments. If the bite is not balanced properly or a nightguard is not used, that extra force can slowly damage the restoration.
The position of the implant also plays a role. Implants placed in the back of the mouth deal with much stronger chewing forces than front teeth. Implant-supported bridges are also at a higher risk of chipping.
How to Reduce the Risk of Chipping
Here's how to reduce the risk of chipping zirconia abutments:
- Choosing the right abutment thickness for every case
- Choosing compatible materials that react well together
- Choose the right polishing techniques that do not affect material integrity
- Recommend night guards for people who grind or clench their teeth
- Adjusting the bite after placement helps avoid uneven pressure
- Regular follow-up visits allow early detection of small chips
Final Thoughts
Chipping is uncommon, especially with modern zirconia restorations when properly designed. Poor fit, polishing, thickness, or angle can contribute to chipping. Individual factors like teeth grinding or poor bite alignment can also lead to this issue.
Get Implant uses carefully selected materials and precise planning to reduce the risk of complications and improve long-term implant success. Request a quote at (713) 296-0329.