Examination of ceramic restoration adhesive coverage in cusp-replacement premolar using acoustic emission under fatigue testing

BioMedical Engineering OnLine

Yen-Hsiang Chang¹  Jin-Jie Yu²  Chun-Li Lin² 

[1] Department of General Dentistry, Chang Gung Memorial Hospital, Ding-Hu Road, Kuei-Shan, Tao-Yuan 333, Taiwan

[2] Department of Biomedical Engineering, National Yang-Ming University, No.155, Sec.2, Linong Street, Taipei 112, Taiwan

关键词: CAD/CAM;    Fatigue;    Acoustic emission;    Ceramic;    Cuspal-coverage;   

Others  :  1084184
DOI  :  10.1186/1475-925X-13-165

 received in 2014-08-26, accepted in 2014-11-19,  发布年份 2014

【 摘 要 】

Background

This study investigates CAD/CAM ceramic cusp-replacing restoration resistance with and without buccal cusp replacement under static and dynamic cyclic loads, monitored using the acoustic emission (AE) technique.

Method

The cavity was designed in a typical MODP (mesial-occlusal-distal-palatal) restoration failure shape when the palatal cusp has been lost. Two ceramic restorations [without coverage (WOC) and with (WC) buccal cuspal coverage with 2.0 mm reduction in cuspal height] were prepared to perform the fracture and fatigue tests with normal (200 N) and high (600 N) occlusal forces. The load versus AE signals in the fracture and fatigue tests were recorded to evaluate the restored tooth failure resistance.

Results

The results showed that non-significant differences in load value in the fracture test and the accumulated number of AE signals under normal occlusal force (200 N) in the fatigue test were found between with and without buccal cuspal coverage restorations. The first AE activity occurring for the WOC restoration was lower than that for the WC restoration in the fracture test. The number of AE signals increased with the cyclic load number. The accumulated number of AE signals for the WOC restoration was 187, higher than that (85) for the WC restoration under 600 N in the fatigue test.

Conclusion

The AE technique and fatigue tests employed in this study were used as an assessment tool to evaluate the resistances in large CAD/CAM ceramic restorations. Non-significant differences in the tested fracture loads and accumulated number of AE signals under normal occlusal force (200 N) between different restorations indicated that aggressive treatment (with coverage preparation) in palatal cusp-replacing ceramic premolars require more attention for preserving and protecting the remaining tooth.

【 授权许可】

   
2014 Chang et al.; licensee BioMed Central Ltd.

【 图 表 】

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