Journal of Oral Implantology October 2014 - (Page 525)

RESEARCH Bone Response From a Dynamic Stimulus on a One-Piece and Multi-Piece Implant Abutment and Crown by Finite Element Analysis Habib Hajimiragha, DDS1 Mohammadreza Abolbashari, DDS2* Saeed Nokar, DDS2 AmirHossein Abolbashari, DDS3 Mehrdad Abolbashari, DDS4 The present study was done to evaluate the effects of different types of abutments on the rate and distribution of stress on the bone surrounding the implant by dynamic finite element analysis method. In this study two ITI abutment models-one-piece and multi-piece-along with fixture, bone, and superstructure have been simulated with the help of company-made models. The maximum Von Mises stress (MVMS) was observed in the distobuccal area of the cortical bone near the crest of implant in two implant models. In the multi-piece abutment, MVMS was higher than the one-piece model (27.9 MPa and 23.3 MPa, respectively). Based on the results of this study, it can be concluded that type of abutment influences the stress distribution in the area surrounding the implant during dynamic loading. Key Words: finite element analysis, one-piece abutment, multi-piece abutment, implant, stress INTRODUCTION Q uality and quantity of bone are important in implant dentistry. They imply the characteristics of the external surface of the edentulous area, which must be considered for implants. Moreover, bone has an internal structure that is described as ''quality'' or ''density,'' which represent the bone strength.1 The mechanical distribution of stress happens first at the contact area of the implant and the bone.2 The percentage 1 Department of Fixed Prosthodontics and Occlusion, Tehran University of Medical Sciences, Tehran, Iran. 2 Department of Fixed Prosthodontics and Occlusion, International Campus of Tehran University of Medical Sciences, Tehran, Iran. 3 Islamic Azad University, Dental Branch of Tehran, Tehran, Iran. 4 Center for Optoelectronics and Optical Communications, Center for Precision Metrology, University of North Carolina, Charlotte, NC. * Corresponding author, e-mail: DOI: 10.1563/AAID-JOI-D-10-00170 of bone-implant contact in the cortical bone is noticeably more than in the trabecular bone.2 Researchers have studied the effect of implant design on stress concentration on the bone during loading; findings have shown that implant design is an important factor in stress distribution on bone.1 The mechanical stress causes bone strain, which means deformation of the bone. These bone deformations in their length are called ''microstrains.'' The amount of strain depends directly on the applied stress on the bone through implant and the mechanical characteristics of the bone (eg, stiffness).3 The stiffness of a titanium implant and its alloys is relatively high on the cortical bone. When the implant is under loading, the stress will be transmitted to the bone and is maximal at the coronal area of the bone. This is consistent with the general mechanical rule that says when two parts are in direct contact and one part is loaded, the highest stress will be on the first contact point Journal of Oral Implantology 525

Table of Contents for the Digital Edition of Journal of Oral Implantology October 2014

New AAIP Affiliates Increase JOI Readership
Letter to the Editor
Bone Response From a Dynamic Stimulus on a One-Piece and Multi-Piece Implant Abutment and Crown by Finite Element Analysis
Effect of Platelet-Rich Plasma on the Healing of Mandibular Defects Treated With Fresh Frozen Bone Allograft: A Radiographic Study in Dogs
Efficacy of Growth Factor in Promoting Early Osseointegration
Assessment of Candida Species Colonization and Denture-Related Stomatitis in Bar- and Locator-Retained Overdentures
A Simple Solution for Vector Control in Vertical Alveolar Distraction Osteogenesis
Maxillary Ridge Augmentation With Custom-Made CAD/CAM Scaffolds. A 1-Year Prospective Study on 10 Patients
A Retrospective 3- to 5-Year Study of the Reconstruction of Oral Function Using Implant- Supported Prostheses in Patients With Hypohidrotic Ectodermal Dysplasia
Effects of a New Implant Abutment Design on Peri-Implant Soft Tissues
Repair Technique for Fractured Implant-Supported Metal-Ceramic Restorations: A Clinical Report
Full-Mouth Rehabilitation for a Patient With Dentinogenesis Imperfecta: A Clinical Report
New Method to Increase Inter-alveolar Height With Preservation of Crestal Cortical Bone for Implant Treatment
Implant Placement With a Guided Surgery System Based on Stress Analyses Utilizing the Bone Density: A Clinical Case Report
A Novel Technique for Osteotome Internal Sinus Lifts With Simultaneous Placement of Tapered Implants to Improve Primary Stability
Maxillary Sinus Augmentation and Implant Placement Using Venous Blood Without Graft Material: A Case Letter
Modification of Maxillary Sinus Floor With Orthodontic Treatment and Implant Therapy: A Case Letter
A Surgical Guide for Optimal Placement and Immediate Restoration of Implant
Osseointegrated Dental Implants in Growing Children: A Literature Review

Journal of Oral Implantology October 2014