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Effects of Cyclic Fatigue Stress‐Biocorrosion on Noncarious Cervical Lesions
Author(s) -
Grippo John O.,
Chaiyabutr Yada,
Kois John C.
Publication year - 2013
Publication title -
journal of esthetic and restorative dentistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.919
H-Index - 60
eISSN - 1708-8240
pISSN - 1496-4155
DOI - 10.1111/jerd.12024
Subject(s) - hydrochloric acid , dentistry , premolar , materials science , medicine , metallurgy , molar
Abstract Problem Although there is a high prevalence of noncarious cervical lesions ( NCCLs ), the etiology of these lesions remains contentious. Purpose To evaluate the combined effects of cyclic fatigue stress and biocorrosion activity on NCCLs . Materials and Methods Extracted premolar teeth were allocated into four groups ( N = 10). Two groups were cyclically fatigue loaded (100 N ; 72 cycles per minute; 9,200 cycles) and placed in either hydrochloric acid gel ( pH = 0.1) or orange juice ( pH = 4). The other two groups were stored in identical chemical solutions without fatigue load. The buccal–lingual width of each tooth was measured before and after testing. The depth of biocorrosion, normalized by the percentage change in buccolingual width, normalized by time (hour) was calculated. The data were analyzed using a two‐way analysis of variance and T ukey's HSD multiple comparison test (α = 0.05). Results Mean ( SD ) of the depth of biocorrosion values were as follows: teeth receiving fatigue loading with hydrochloric acid gel exposure (1.003%/hour [0.063]) revealed a significantly higher depth of biocorrosion than the fatigue‐loaded group with orange juice exposure (0.511%/hour [0.281]) ( p < 0.01). For the groups without fatigue loading, those with hydrochloric acid gel (0.022%/hour [0.006]) had a significantly higher depth of biocorrosion than the group with orange juice (0.009%/hour [0.004]) ( p < 0.01). The cyclically fatigue‐loaded teeth with hydrochloric acid gel had a significantly greater depth of biocorrosion than either group without fatigue loading ( p < 0.001). Conclusions Cyclic fatigue stress—acidic biocorrosion had a significant effect on the depth of the NCCLs . Clinical Significance In order to manage the destructive NCCL s lesions properly, it is essential to understand the etiology of these lesions. The present study indicated that the combined mechanisms of cyclic fatigue stress and biocorrosion could contribute to the formation of NCCL s.