Journal of Oral Implantology October 2012 - (Page 595)

RESEARCH Acrylic Resin Polymerization in Direct Contact to the Abutment and the Temperature at Bone-Implant Interface: A Pilot In Vitro Study Mahmood Kazemi, DMD, MS1 Hamid Jalali, DMD, MS1 Mehrdad Eghtedari, DMD, MS2 Roozbeh Sadrimanesh, DDS, MS3* Pooyan Sadr-Eshkevari, DDS4 Peter Maurer, Dr Med, Dr Dent, PD5 Three autopolymerizing acrylic resins were applied to a titanium alloy abutment connected to 2 different diameters of an implant. The implants were embedded in fresh iliac bone of sheep in a 378C water bath. Temperature changes were recorded via embedded thermocouples at the cervical (T1) and apical (T2) regions of the implant surface. Polymerization temperature of acrylic resins did not seem to exceed the critical threshold of 478C. Key Words: bone regeneration, dental implant, implant-supported dental prosthesis, osseointegration, polymerization temperature, polymethacrylic acids INTRODUCTION utopolymerizing acrylic resins, which are routinely used in the fabrication of implant-borne temporary prostheses, are associated with high polymerization temperatures that might pose a potential risk to the bone-implant interface when directly applied to the implant abutments.1 The mean polymerization temperatures of 4 common autopolymerizing acrylic resins is reported to be between 338C and 558C.2,3 Excess temperature may Department of Prosthodontics, School of Dental Medicine, Tehran University of Medical Sciences, Tehran, Iran. Department of Prosthodontics, School of Dental Medicine, Ahvaz Jondishapoor University of Medical Sciences, Ahvaz, Iran. 3 Department of Oral and Maxillofacial Prosthodontics and Implants, School of Dental Medicine, Tehran University of Medical Sciences, Tehran, Iran. 4 Farzan Clinical Research Institute, Tehran, Iran; Department of ¨t, Oral and Maxillofacial Plastic Surgery, Ruhr Universita Bochum, Germany. 5 ¨t Department of Oral and Maxillofacial Surgery, Ruhr Universita * Corresponding author, e-mail: sadrimnsh@yahoo.com DOI: 10.1563/AAID-JOI-D-10-00067 2 1 A impair the regenerative potential of the bony tissue and result in necrosis (thermal damage).4,5 Studies have shown that bony changes in response to temperature start at 478C. Temperatures equal to or above 608C can cause permanent vascular stasis and bone necrosis.6,7 Several studies have concerned the temperature rise and its effects during bone drilling.8–11 Several others have concerned the exothermal activity of polymerizing material and the effect of different factors on temperature rise.12–16 It has been shown that successful implant treatment depends on the proper integration between the implant and the surrounding bony structures and soft tissues.17 To the best of our knowledge, however, few studies have addressed the effect of temperature rise during acrylic resin polymerization in contact with the implant abutment.1 This study was then conducted to assess the temperature alterations of implant surface during the polymerization of 3 acrylic resins in direct contact with the abutments placed in bone. The null hypothesis stated that the Journal of Oral Implantology 595

Table of Contents for the Digital Edition of Journal of Oral Implantology October 2012

Should the Implant Fit the Patient or Should the Patient Fit the Implant?
Histologic and Biomechanical Evaluation of Alumina-Blasted/Acid-Etched and Resorbable Blasting Media Surfaces
Impact of Dental and Zygomatic Implants on Stress Distribution in Maxillary Defects: A 3-Dimensional Finite Element Analysis Study
Precision of Implant Placement With Stereolithographic Templates: A Pilot In Vitro Study
An Evaluation of Biocompatibility of Indigenously Produced Pure Titanium: An Experimental Study in Rabbits
Relationship Between Smoking and Bleeding on Probing
Stress Analysis in Platform-Switching Implants: A 3-Dimensional Finite Element Study
Acrylic Resin Polymerization in Direct Contact to the Abutment and the Temperature at Bone-Implant Interface: A Pilot In Vitro Study
Clinical Application of Stereolithographic Surgical Guide With a Handpiece Guidance Apparatus: A Case Report
Fixed Rehabilitation of Severely Atrophic Jaws Using Immediately Loaded Basal Disk Implants After In Situ Bone Activation
A Functional Open-Tray Impression Technique for Implant-Retained Overdenture Prostheses
Use of Plasma Rich in Growth Factor for Schneiderian Membrane Management During Maxillary Sinus Augmentation Procedure
A Technique to Facilitate the Fabrication of Provisional Restorations for ITI Solid Abutments
Influence of Etiologic Factors in Peri-Implantitis: Literature Review and Case Report
Simplistic Partially Limiting Surgical Guide for Flapless Implant Placement: A Case Report
Types of Implant Surgical Guides in Dentistry: A Review
Rehabilitation of Atrophic Posterior Maxilla With Zygomatic Implants: Review

Journal of Oral Implantology October 2012