The purpose of this descriptive study was to analyze the behavior of a bicomponent custom-made zirconia abutment used with an internal connection implant system. The microscopic marginal fit and specific mechanical characteristics of 20 titanium platform and zirconia abutment complexes were evaluated. Scanning electron microscope analysis showed mean values of 10.03 microm for the horizontal gap and 4.419 microm for the vertical gap for the components. The traction test revealed a mean maximum load value of 190 N, whereas the bending test showed a mean maximum load value of 436 N.
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J Prosthodont Res
January 2025
Department of Masticatory Function and Health Science, Division of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU), Tokyo, Japan.
Purpose: To compare the stress distribution in loaded zirconia resin-bonded fixed dental prostheses (RBFDPs) and periodontal tissue using finite element analysis, considering reduced alveolar bone levels and the number of retainers.
Methods: A human skull was micro-CT scanned. Three framework designs were tested: a 2-unit RBFDP using the maxillary left central incisor (#21) as an abutment, another using a canine (#23), and a 3-unit RBFDP using both #21 and #23.
J Prosthodont Res
January 2025
School and Hospital of Stomatology, Fujian Medical University, Fuzhou, China.
Purpose: This study aimed to evaluate the effect of functional loading on microgaps and microleakage at implant-abutment interfaces (IAIs) in the aesthetic zone when using different abutments and to provide a clinical reference for abutment selection.
Methods: This study included 30 patients with 36 implants divided into three groups: zirconia (Zr)-one-piece custom abutment, titanium (Ti)-custom abutment, and Ti-original abutment. Scanning electron microscopy was used to examine alterations in the microgaps at the IAIs under functional loading.
Dent J (Basel)
November 2024
Department of Restorative Dentistry and Biomaterials Sciences, Harvard School of Dental Medicine, Boston, MA 02115, USA.
Occlusion plays a crucial role in the long-term success and functionality of dental restorations. The purpose of this study was to investigate the changes in occlusal contacts upon the cementation of zirconia crowns with different cement spacer settings in computer-aided design and computer-aided manufacturing (CAD-CAM) software (3Shape Dental System version 2.102.
View Article and Find Full Text PDFJ Esthet Restor Dent
December 2024
Analysis of Techniques, Material and Instruments Applied to Digital Dentistry and CAD/CAM Procedures Research Group, University Complutense of Madrid, Madrid, Spain.
Objective: This clinical case describes a multidisciplinary retreatment of a patient with anterior fixed dental prostheses (FDPs) using minimally invasive restorations and a biologically oriented preparation technique (BOPT).
Clinical Considerations: A 56-year-old female patient, treated 30 years ago with a metal-ceramic FDP due to dental agenesis, presented a misfit prosthesis at the gingival margin, black spaces, and food retention at the pontics. Notably, tooth number 2.
Case Rep Dent
December 2024
Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, Minnesota 55455, USA.
This case report features a female patient with the chief complaint of needing to replace an anterior crown. After a comprehensive oral assessment and cone beam computed tomography (CBCT) radiographic examination, it was determined that the crown on Tooth #9 was subgingivally fractured. The procedure involved atraumatic extraction of Tooth #9, followed by immediate implant placement.
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