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Related Experiment Video

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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material

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Damage maps for layered ceramics under simulated mastication.

J-H Kim¹, J-W Kim, S-W Myoung

¹Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.

Journal of Dental Research

|June 25, 2008

Summary

This summary is machine-generated.

Off-axis loading during chewing causes different ceramic fracture patterns than direct downward force. This study reveals how biting forces impact dental ceramic durability and failure modes.

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Area of Science:

Biomaterials Science
Dental Materials
Mechanical Engineering

Background:

Ceramic dental restorations, including monolithic and porcelain-veneered types, are susceptible to chipping and fracture under repeated occlusal loading.
Occlusal loading involves biting forces applied off-axis, where teeth slide along cuspal inclines.

Purpose of the Study:

To investigate the hypothesis that off-axis contact-load-slide-liftoff fatigue loading results in different fracture modes and fatigue lifespans compared to axial fatigue loading in layered ceramics.
To understand the biomechanical factors influencing ceramic restoration failure under simulated oral conditions.

Main Methods:

A transparent model system using monolithic glass plates bonded to polycarbonate substrates simulated all-ceramic crowns on dentin.
Off-axis and axial cyclic loading were applied using a hard sphere in water via a mouth-motion machine to mimic chewing forces.
Fracture modes and fatigue lifespans were analyzed under both loading conditions.

Main Results:

Off-axis loading proved more detrimental to the occlusal surface, leading to contact-induced fractures.
Conversely, axial loading was more harmful to the cementation surface, causing flexure-induced fractures in brittle layers.
The tangential load component in off-axis loading influenced the fracture behavior.

Conclusions:

Off-axis loading presents a distinct failure mechanism for ceramic restorations compared to axial loading.
Understanding these differential effects is crucial for improving the clinical longevity and fracture resistance of dental ceramics.
The findings have direct clinical relevance for the design and application of ceramic restorations in dentistry.