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1- Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran , amirreza1990@gmail.comD
2- Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
3- Department of Oral and Maxillofacial Medicine, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
2- Department of Prosthodontics, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran
3- Department of Oral and Maxillofacial Medicine, Dental Sciences Research Center, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
Abstract: (65 Views)
Abstract
Introduction: The retention of zirconia crowns during recementation is influenced by cleaning methods and surface treatments; however, comparative data on combined cleaning and surface-modification protocols remain limited. This study aimed to investigate the effects of two cleaning methods and two surface-treating techniques on the retention force of implant-supported zirconia crowns during recementation.
Materials and Methods: This in vitro study utilized 80 prefabricated one-piece implant abutments and analogs mounted in acrylic blocks. Monolithic zirconia crowns were fabricated using computer-aided design/computer-aided manufacturing (CAD/CAM) technology. The samples were divided into two groups based on cement type, Temp Bond and Dycal groups (40 in each). Each group was divided according to the cleaning methods as ultrasonic and 37% phosphoric acid cleaning (20 in each) and further divided according to the different surface treatment methods as airborne particle abrasion (APA) and grooving (Gr) (10 in each). Initial cementation and tensile testing were performed using a universal testing machine, followed by recementation and repeated testing. Data were analyzed statistically (α=0.05).
Results: Dycal cement showed significantly higher retention (42.68 ± 1.40 N) compared to Temp Bond (22.03 ± 1.18 N). Acid + grooving resulted in the highest retention in both groups (Dycal: 53.91 ± 2.48 N; Tempbond: 31.65 ± 0.72 N). Significant interactions between cement type, cleaning method, and surface modifications were observed (p<0.001).
Conclusions: The study demonstrated the higher retention of Dycal over Temp Bond, phosphoric acid over ultrasonic cleaning, and grooving over the APA method on retention of zirconia crowns
Introduction: The retention of zirconia crowns during recementation is influenced by cleaning methods and surface treatments; however, comparative data on combined cleaning and surface-modification protocols remain limited. This study aimed to investigate the effects of two cleaning methods and two surface-treating techniques on the retention force of implant-supported zirconia crowns during recementation.
Materials and Methods: This in vitro study utilized 80 prefabricated one-piece implant abutments and analogs mounted in acrylic blocks. Monolithic zirconia crowns were fabricated using computer-aided design/computer-aided manufacturing (CAD/CAM) technology. The samples were divided into two groups based on cement type, Temp Bond and Dycal groups (40 in each). Each group was divided according to the cleaning methods as ultrasonic and 37% phosphoric acid cleaning (20 in each) and further divided according to the different surface treatment methods as airborne particle abrasion (APA) and grooving (Gr) (10 in each). Initial cementation and tensile testing were performed using a universal testing machine, followed by recementation and repeated testing. Data were analyzed statistically (α=0.05).
Results: Dycal cement showed significantly higher retention (42.68 ± 1.40 N) compared to Temp Bond (22.03 ± 1.18 N). Acid + grooving resulted in the highest retention in both groups (Dycal: 53.91 ± 2.48 N; Tempbond: 31.65 ± 0.72 N). Significant interactions between cement type, cleaning method, and surface modifications were observed (p<0.001).
Conclusions: The study demonstrated the higher retention of Dycal over Temp Bond, phosphoric acid over ultrasonic cleaning, and grooving over the APA method on retention of zirconia crowns
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