Laboratory Simulation of Longitudinally Cracked Teeth Using the Step-stress Cyclic Loading Method

Overview

Journal Int Endod J

Specialty Dentistry

Date 2021 Apr 14

PMID 33852743

Citations 3

Authors

F Lin

R Ordinola-Zapata

H Xu

Y C Heo

A Fok

Affiliations

Soon will be listed here.

Abstract

Aim: To simulate in a laboratory setting longitudinal cracking in root filled premolar teeth, using cyclic mechanical fatigue.

Methodology: Mesial-occlusal-distal (MOD) cavities were prepared in twenty root filled, single-rooted, mandibular premolars restored with fibre posts and resin composites. The samples were randomly divided into two groups based on the loading approaches: static loading with a crosshead speed of 0.5 mm/min and step-stress cyclic loading (1 Hz) with increasing amplitude. The loads and numbers of cycles to failure were recorded. Micro-CT was also used to identify the fracture modes. Statistical analysis was performed using Student's t-test. The level of significance was set at 0.05.

Results: The mean fracture loads for the static loading and cyclic loading groups were 769 ± 171 N and 720 ± 92 N, respectively. There was no significant difference between the two groups (P > 0.05). The proportions of longitudinal, cuspal and mixed-mode fractures under cyclic loading were 50%, 20% and 30%, respectively. Longitudinal fractures occurred with larger numbers of cycles and higher average loads per cycle compared with the other fractures. Static loading produced only cuspal fractures.

Conclusions: Longitudinally cracked premolar teeth with root fillings were successfully produced using the step-stress cyclic loading method. This provides a more clinically representative methodology for studying cracked teeth in a laboratory setting.

Citing Articles

Fracture resistance after root canal filling removal using ProTaper Next, ProTaper Universal Retreatment or hybrid instrumentation: an study.

Hanafy H, Bedier M, Amin S Restor Dent Endod. 2024; 49(4):e38.

PMID: 39649538 PMC: 11621311. DOI: 10.5395/rde.2024.49.e38.

A critical analysis of research methods and experimental models to study the load capacity and clinical behaviour of the root filled teeth.

Ordinola-Zapata R, Lin F, Nagarkar S, Perdigao J Int Endod J. 2022; 55 Suppl 2:471-494.

PMID: 35263455 PMC: 9314814. DOI: 10.1111/iej.13722.

Fatigue analysis of restored teeth longitudinally cracked under cyclic loading.

Lin F, Ordinola-Zapata R, Ye N, Xu H, Fok A Dent Mater. 2021; 38(1):204-213.

PMID: 34949478 PMC: 8792291. DOI: 10.1016/j.dental.2021.12.005.

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