Effect of Accessory Retention Forms on the Bond Strength of Resin-bonded Fixed Partial Dentures: a 3D Finite Element Study

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Abstract Interface debonding between prostheses and abutments was the most frequent failure mode of resin-bonded fixed partials dentures (RBFPDs) in clinic. The purpose of this study was to investigate the effect of accessory retention forms on the bond strength of RBFPDs. Three types of 3D finite element models were constructed. The model of posterior metal plate RBFPD with spoon-shaped occlusal rest seats served as the control. The remaining two types of models based on the control added the retention form design of the pin hole and axial groove respectively. The axial or buccolingual load of 150 N was applied on the prosthesis, first premolar and first molar respectively. The maximum principal stresses of the adhesive layer in different models were calculated. Under the load of the same magnitude, the stress due to the buccolingual load was significantly higher than that due to the axial load in the adhesive layer. The proximal shoulder, occlusal rest seats wall and the proximal margin adjacent to the shoulder were the high risk region where the adhesive layer damaged easily. Compared with the control model, the pin and groove models could slightly decrease the stress in the adhesive layer after the axial loading, while the stress in the adhesive layer drastically decreased after horizontal loading and reduced by 22% and 31% respectively. These results indicate that the horizontal occlusal force has a more serious harm to the debonding of RBFPDs. In addition, the accessory retention forms (e.g. pin and axial groove retention forms) can decrease the stress level in the adhesive layer, which are conducive to increase the load-bearing capacity of RBFPDs.

Key words： resin-bonded fixed partial dentures finite element analysis bond strength accessory retention forms

Received: 21 June 2016

PACS:

R 783.3

Corresponding Authors: FAN Yu-bo. E-mail: yubofan@buaa.edu.cn

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	HAN Jin-yong
	WANG Chao
	FAN Yu-bo

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HAN Jin-yong,WANG Chao,FAN Yu-bo. Effect of Accessory Retention Forms on the Bond Strength of Resin-bonded Fixed Partial Dentures: a 3D Finite Element Study[J]. Chinese Journal of Biomedical Engineering, 2016, 25(2): 87-92.

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http://manu32.magtech.com.cn/Jwk_zgswyx_en/EN/ OR http://manu32.magtech.com.cn/Jwk_zgswyx_en/EN/Y2016/V25/I2/87

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