A novel retentive type of dental implant prosthesis: marginal fitness of the cementless double crown type implant prosthesis evaluated by bacterial penetration and viability
홍성진, 권긍록, 장은영, 문지회,
소속 상세정보
홍성진 ( Hong Seoung-Jin ) - Kyung Hee University Dental Hospital Department of Prosthodontics
권긍록 ( Kwon Kung-Rock ) - Kyung Hee University School of Dentistry Department of Prosthodontics
장은영 ( Jang Eun-Young ) - Kyung Hee University School of Dentistry Department of Oral Microbiology
문지회 ( Moon Ji-Hoi ) - Kyung Hee University School of Dentistry Department of Oral Microbiology
Abstract
PURPOSE: This study aims to compare the marginal fitness of two types of implant-supported fixed dental prosthesis, i.e., cementless fixation (CL.F) system and cement-retained type.
MATERIALS AND METHODS: In each group, ten specimens were assessed. Each specimen comprised implant lab analog, titanium abutment fabricated with a 2-degree tapered axial wall, and zirconia crown. The crown of the CL.F system was retained by frictional force between abutment and relined composite resin. In the cement-retained type, zinc oxide eugenol cement was used to set crown and abutment. All specimens were sterilized with ethylene oxide, immersed in Prevotella intermedia culture in a 50 mL tube, and incubated with rotation. After 48 h, the specimens were washed thoroughly before separating the crown and abutment. The bacteria that penetrated into the crown-abutment interface were collected by washing with 500 μL of sterile saline. The bacterial cell number was quantified using the agar plate count technique. The BacTiter-Glo Microbial Cell Viability Assay Kit was used to measure bacterial adenosine triphosphate (ATP)-bioluminescence, which reflects the bacterial viability. The t-test was performed, and the significance level was set at 5%.
RESULTS: The number of penetrating bacterial cells assessed by colony-forming units was approximately 33% lower in the CL.F system than in the cement-retained type (P<.05). ATP-bioluminescence was approximately 41% lower in the CL.F system than in the cement-retained type (P<.05).
CONCLUSION: The CL.F system is more resistant to bacterial penetration into the abutment-crown interface than the cement-retained type, thereby indicating a precise marginal fit.
키워드
Implant-supported fixed dental prosthesis; Cementless fixation system; Marginal fitness; Bacterial penetration; Cement-retained type
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