Zirconia vs PEEK: How Different Framework Materials Handle Chewing Forces on Implants

Published in Journal of Datta Meghe Institute of Medical Sciences University — June 2023. Co-authored by Gunjan Tahilramani, Deepali Barapatre, Sunil Kumar Mishra, Dr. B. Srinivas Rao, and Ramesh Chowdhary.

Every time you bite into food, the forces generated travel from your teeth through the prosthesis, into the dental implants, and finally into the surrounding jawbone. How those forces are distributed matters enormously — uneven or excessive stress concentration at any point can lead to component fracture, bone loss around the implant, or even implant failure over time.

The material your implant prosthesis is made from plays a direct role in how these forces are managed. This study used finite element analysis — a sophisticated computer simulation technique borrowed from aerospace and mechanical engineering — to compare how two very different framework materials behave under chewing loads.

The Two Materials Tested Zirconia is a ceramic material known for its exceptional hardness, natural appearance, and role in a premium [smile makeover](/services/smile-makeover). It is widely used in modern implant dentistry for crowns, bridges, and framework construction. However, its rigidity means it transmits forces quite directly to the underlying implant and bone.

PEEK (polyetheretherketone) is a high-performance polymer with a modulus of elasticity much closer to natural bone than zirconia or metal. This means it has a degree of flexibility that allows it to absorb and cushion chewing forces rather than transmitting them rigidly.

How the Study Was Conducted The researchers created detailed 3D computer models of implant-supported fixed dental prostheses — specifically focusing on the pontic area, which is the section of the prosthesis that spans the gap where a tooth is missing. Both vertical forces (biting straight down) and oblique forces (the sideways component of chewing) were simulated.

The simulation measured von Mises stress values — a standard engineering metric that shows where and how intensely stress concentrates within a structure — across the framework, the implant components, and the surrounding bone.

Key Findings Under both vertical and oblique loading, the PEEK framework showed lower stress concentration at the implant-bone interface compared to zirconia. The flexibility of PEEK allowed it to absorb a portion of the chewing force within the framework itself, reducing the amount of stress reaching the bone.

Zirconia, while stronger and more rigid, tended to transfer higher peak stresses directly to the implant neck and crestal bone region — the area most vulnerable to resorption over time.

However, zirconia showed superior resistance to deformation under load, meaning the prosthesis itself maintained its shape more precisely during function.

What This Means for Patients There is no single best material for every patient. The choice between zirconia and PEEK depends on individual factors including your bone quality, bite force, grinding habits, and aesthetic requirements. A patient with strong bone and normal bite forces may benefit from the precision and aesthetics of zirconia. A patient with compromised bone or a heavy clenching habit may benefit from the shock-absorbing properties of PEEK.

At Maxface Dental Clinic, we utilize advanced dental implants and customized framework designs of these material properties to make evidence-based framework material recommendations tailored to each patient's clinical situation — rather than applying a one-size-fits-all approach.

About the Publication Journal: Journal of Datta Meghe Institute of Medical Sciences University

Published: June 2023

Type: Finite Element Analysis Study

Read the original publication on ResearchGate.