Journal of Oral Implantology February 2014 - (Page 69)

RESEARCH Assessment of the Effect of Two Occlusal Concepts for Implant-Supported Fixed Prostheses by Finite Element Analysis in Patients With Bruxism ¨ Evrim Gore, PhD* ¨ ¨ Gulumser Evlioglu, Prof ˘ The aim of this study was to evaluate the effects of bruxing forces on implants configured under 2 different occlusal schemes by dynamic finite element analysis. A main model consisting of a 5-unit fixed partial denture supported by 3 implants was simulated with bone, implants, and superstructures. All calculations were made individually for each component, namely porcelain crowns, abutments, abutment screws, implants, and bone. Maximum stresses were found in the group-function occlusion. Group-function loading may result excess stresses on the components compared with canine-guidance loading. According to the results of this study, use of canine guidance is encouraged in bruxers with implant-supported prostheses. Key Words: bruxism, implant, implant supported prosthesis, occlusion, finite element analysis INTRODUCTION B ruxism is defined as a parafunctional habit occurring during sleep or while awake that is characterized by grinding and/or clenching of the teeth.1-4 This parafunction may provoke an increase in muscular forces, and the overloaded structures may lead to temporomandibular dysfunctions, periodontal problems, wear on teeth, and failure of restorations on natural teeth and oral implants.1,5-9 Such negative outcomes may also cause early wear or fracture of implant components.10,11 The so-called bending forces and overload may cause deleterious effects on implants, supporting alveolar bone, and the prostheses they support.10 Although this parafunctional habit is considered a critical factor in implant success, there is no scientific proof that bruxism is a definite contraindication for implant treatment provided that attention has been paid to some critical load Department of Maxillofacial Prosthodontics, Faculty of Dentistry, Istanbul University, Turkey. * Corresponding author, e-mail: evrimgore@yahoo.com DOI: 10.1563/AAID-JOI-D-11-00044 control factors.11-13 Occlusion may dramatically influence the effect of bruxism in patients with implant-supported prostheses.10,14 Implant occlusion principles mostly agree with occlusal principles in natural tooth restorations.15 Yet the mechanical effects of the occlusal concepts on oral implant components have not been clearly shown in the literature. Therefore, the aim of the present study is to compare the effects of canine guidance and group-function occlusal concepts on implant loading under heavy bruxing forces using a 3-dimensional dynamic finite element analysis method. MATERIALS AND METHODS Models A posterior mandibular segment with a 5-unit fixed partial denture supported by 3 endosseous cylindric implants between canine and second molar area was simulated with a 3-dimensional finite element model (Figure 1). The CATIA design program `mes SA, Ve ´lizy-Villacoublay, France) (Dassault Syste was used to geometric modeling. The implants Journal of Oral Implantology 69

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

Evolution of Bone Grafting for Improved Predictability
Electrochemical Behavior of Titanium in Artificial Saliva: Influence of pH
Efficacy of Antibacterial Sealing Gel and O-Ring to Prevent Microleakage at the Implant
Wired/Classic and Wireless/Periotest ‘‘M’’ Instruments: An In Vitro Assessment of
Altered Position of the Medial Lingual Nutritional Foramina at Different Stages of Alveolar
Genotoxicity of Endosseous Implants Using Two Cellular Lineages In Vitro
Implants With Internal Hexagon and Conical Implant-Abutment Connections: An In Vitro
Stress Distribution Around Maxillary Anterior Implants as a Factor of Labial Bone Thickness
Peri-Implant Biomechanical Responses to Standard, Short-Wide, and Mini Implants
Removal Torque Analysis of Implants in Rabbit Tibia After Topical Application of
Nonprocessed Adipose Tissue Graft in the Treatment of Peri-Implant Osseous Defects in
Assessment of the Effect of Two Occlusal Concepts for Implant-Supported Fixed
Nerve Damage Assessment Following Implant Placement in Human Cadaver Jaws:
Dental Implants: Early Versus Standard Two-Stage Loading (Animal Study)
Intravenous Sedation for Implant Surgery: Midazolam, Butorphanol, and
Nanocrystalline Hydroxyapatite-Based Material Already Contributes to Implant Stability
Two Neglected Biologic Risk Factors in Bone Grafting and Implantology: High Low-Density

Journal of Oral Implantology February 2014