The orthodontic bonding properties of human enamel after cryopreservation

Roo, Noëmi M C De; Deboosere, Eline; Thierens, Laurent A. M.; Vercruysse, Chris; Temmerman, Liesbeth; Verbeeck, Ronald; Pauw, Guy A.M. De

doi:10.4012/dmj.2019-208

Cited by 1 publication

(1 citation statement)

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“…Previous research has demonstrated that cryopreservation does not affect dentin permeability [4], dentin bond strength [5] or enamel bond strength [6]. Although the Vickers test demonstrated that the hardness of enamel was not affected by cryopreservation, a longitudinal fracture was found in 1 4 of the teeth after freezing [7].…”

Section: Introductionmentioning

confidence: 93%

In Vitro Investigation into the Effect of Cryopreservation on the Mechanical Characteristics of Dental Hard Tissues

De Roo,

Toulouse,

Thierens

et al. 2023

JFB

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Previous research has reported on hidden damage within the dentin introduced by cryopreservation, but the effect on the mechanical properties of the hard tissues at tooth level remains unclear. The main objective of this study is to investigate the effect of cryopreservation on the mechanical properties of teeth. A matched sample of 234 premolars of 117 children (9 ≤ age ≤ 16 years), bilaterally extracted for orthodontic reasons, were included. For each child, one tooth was randomly allocated to the cryopreservation group and the contralateral tooth was assigned to the control group. Static compression tests were performed to determine load to failure, stiffness, and toughness. In a subgroup of 20 teeth, a cyclic preloading or chewing simulation was performed. Additionally, the fracture mode was determined, and the microstructure of the fractured surfaces was examined using a scanning electron microscope (SEM). Linear mixed model analyses could not detect a statistical difference in the mean load to failure (p = 0.549), mean toughness (p = 0.968), or mean stiffness (p = 0.150) between cryopreserved and non-cryopreserved teeth. No significant difference in load to failure after cyclic preloading was detected between groups (p = 0.734). SEM analysis revealed comparable fracture characteristics between groups. It is concluded that cryopreservation does not affect the mean load to failure, stiffness, or toughness of teeth, indicating that hidden damage in the dentin is not critical at tooth level.

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