Journal of Oral Implantology August 2013 - (Page 417)
RESEARCH
Marginal Fit of Implant-Supported All-Ceramic Zirconia
Frameworks
Hanaa Hassan Zaghloul, PhD1*
Jihan Farouk Younis, PhD2
This study evaluated the effect of fabrication techniques and cyclic loading on the vertical marginal fit of implantsupported fixed partial denture (FPD) frameworks. Thirty implant-supported 3-unit FPD frameworks were
fabricated on a model system, divided into 3 equal groups (n ¼ 10). The first group (control) was constructed from
base metal alloy; the other 2 test groups were constructed from all-ceramic zirconia using a computer-aided
design/computer-aided manufacturing (CAD/CAM) Cerec 3 system and a copy milling (Zirkonzahn) system. A
cyclic load of 200 N was applied to each framework for up to 50,000 cycles. Linear measurements were made in
micrometers of the vertical gap between the framework and the implant-supported abutment at 16
predetermined points before and after cyclic loading. The frameworks were viewed using scanning electron
microscopy to inspect any fractographic features. One-way analysis of variance was performed to compare the
marginal discrepancy values of the control and the 2 test groups and for each group; a t test was applied to
determine whether significant changes in the fit were observed after cyclic loading (a ¼ 0.05). The CAD/CAM
group showed significantly higher marginal gap mean values (80.58 lm) than the Zirkonzahn and control groups
(50.33 lm and 42.27 lm, respectively) with no significant difference. After cyclic loading, the CAD/CAM group
recorded the highest marginal gap mean value (91.50 6 4.260 lm) followed by control group (72.00 6 2.795 lm);
the Zirkonzahn group recorded the lowest marginal gap (65.37 6 6.138 lm). Cyclic loading significantly increased
the marginal gap mean values in the control group only. A marginal chip was observed in one of the CAD/CAM
ceramic frameworks. Within the limitations of this study, the fabrication technique influenced the marginal fit of
the implant-supported 3-unit FPD frameworks. Cyclic loading failed to change the fit of all-ceramic zirconia
frameworks, whereas significant changes were found in the metal frameworks.
Key Words: implant-supported restoration, marginal fit, ceramic, zirconia, fabrication technique, cyclic
loading, fractography
INTRODUCTION
T
he continuous development of osseointegration and implantology makes it
possible today to perform prosthetic
restorations that provide for the reestablishment of function, esthetics, and
phonetics in a foreseeable manner. Thus, the use
of dental implants to replace absent teeth has
1
Conservative Dentistry Department, Faculty of Oral and Dental
Medicine, Misr International University, Cairo, Egypt.
2
Crown and Bridge Department, Faculty of Dentistry, Ain-Shams
University, Heliopolis, Egypt.
* Corresponding author, email: hh_zaghloul@hotmail.com
DOI: 10.1563/AAID-JOI-D-11-00103
become routine in oral rehabilitation because it
prevents the wearing of entire teeth and lateral
loads on tooth abutments of removable partial with
distal extension.1. To ensure this predictability of
treatment, the seating of the prosthesis with total
passivity to implants or temporary abutments is
very important. Therefore, a passive fit of the fixed
partial denture (FPD) is desirable to prevent
uncontrolled stresses not only in the adjacent bone
but also in the reconstruction itself.2 On the other
hand, laboratory studies suggest that most complications with implant-supported prostheses can be
directly connected to the lack of passive fit between
the prosthetic framework and abutment,3–5 such as
Journal of Oral Implantology
417
Table of Contents for the Digital Edition of Journal of Oral Implantology August 2013
Literary Responsibility—Everyone Has a Role to Play
Rehabilitation of Surgically Relocated Integrated Dental Implants With and Without Bone Morphogenesis Protein-2
Erratum
Marginal Fit of Implant-Supported All-Ceramic Zirconia Frameworks
Influence of the Implant Diameter With Different Sizes of Hexagon: Analysis by 3-Dimensional Finite Element Method
Autologous Dental Pulp Stem Cells in Regeneration of Defect Created in Canine Periodontal Tissue
Histologic and Biomechanical Evaluation of 2 Resorbable-Blasting Media Implant Surfaces at Early Implantation Times
Efficacy of Guided Bone Regeneration Using Composite Bone Graft and Resorbable Collagen Membrane in Seibert’s Class I Ridge Defects: Radiological Evaluation
Minimal Iliac Bone Harvesting in Sinus Lift Surgery
Functional Load in Oblique Bicortical Implants: Parasinusal Implants and Palatine Implants
Ultrasonic Oscillations for Conservative Retrieval of a Rare Fracture of Implant Healing Abutment
Craniofacial Implant-Retained Auricular Prosthesis: A Case Report
Gingival Conditioning in an Implant-Supported Prosthesis: A Clinical Report
An Early Loaded Implant-Supported Mandibular Complete Arch Fixed Prosthesis in a Young Completely Edentulous Patient: A Case Report
Computer Guided Surgery for Implant Placement and Dental Rehabilitation in a Patient Undergoing Sub-Total Mandibulectomy and Microvascular Free Flap Reconstruction
Guided Bone Regeneration for Socket Preservation in Molar Extraction Sites: Histomorphometric and 3D Computerized Tomography Analysis
Osseointegration of Dental Implants and Osteonecrosis of the Jaw in Patients Treated With Bisphosphonate Therapy: A Systematic Review
Review of Current Literature
Journal of Oral Implantology August 2013
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