Journal of Oral Implantology December 2014 - (Page 633)

RESEARCH Effect of Splinting in Accuracy of Two Implant Impression Techniques Erica Dorigatti de Avila, PhD1* Fernanda de Matos Moraes, DDS1 Sabrina Maria Castanharo, PhD1 Marcelo Antonialli Del'Acqua, PhD2 Francisco de Assis Mollo, Jr, PhD1 Because there is no consensus in the literature about the need for a splint between copings, the aim of this study was to evaluate, in vitro, the accuracy of 2 impression techniques for implant-supported prostheses. A master cast was fabricated with four parallel implant abutment analogs and a passive framework. Two groups with 5 casts each were formed: Group 1 (squared impression copings with no splint: S) and Group 2 (splinted squared impression copings, using metal drill burs and Pattern resin: SS). The impression material used was polyvinyl siloxane with open trays for standard preparation of the casts. For each cast, the framework was positioned, and a titanium screw was tightened with 10 NÁcm torque in analog A, after which measurements of the abutment-framework interface gaps were performed at analogs C and D. This process was repeated for analog D. These measurements were analyzed using software. A one-way analysis of variance (ANOVA) with a confidence interval of 95% was used to analyze the data. Significant differences were detected between S and SS in relation to the master cast (P 0.05). The median values of the abutment-framework interface gaps were as follows: master cast: 39.64 lm; squared impression copings with no splint: 205.86 lm; splinted squared impression copings: 99.19 lm. Under the limitations of this study, the technique presented for Group 2 produces better results compared with the technique used for Group 1. Key Words: dental implants, impression techniques, splinting material, dental material, impression materials INTRODUCTION T he accuracy of the transfer of the implant positions to the final cast is the determining factor for the success of total or partial rehabilitation with implant-supported prostheses, as the prosthesis and the framework will be created using this cast.1 Over the past decades, many abutments-such as the UCLA abutment and the DIA anatomic abutment- were introduced to resolve complications. However, 1 Department of Dental Materials and Prosthodontics, Araraquara Dental School Univ Estadual Paulista (UNESP), Araraquara SP, Brazil. 2 ˜ Araraquara University Center - UNIARA, Araraquara, Sao Paulo, Brazil. * Corresponding author, e-mail: DOI: 10.1563/AAID-JOI-D-12-00198 problems remained with improper fit, imprecise adaptation, and unfavorable anti-rotational capacity.2 These mechanical complications could lead to the loss of the screws, screw fracture, implant fracture and disequilibrium of the occlusion. With the recent development of computer-aided design/computer-aided manufacturing technology, custom abutments are gradually coming into use in certain systems of dental implants. This new system fascinated professionals with the possibility of the fabrication of prosthesis components around dental implants with extreme accuracy. However, these techniques are based on the digitalization of a cast produced through conventional steps.3 The computer-aided design system has the capacity for the three-dimensional evaluation, through scanner tone detection of the surface of a dental stone cast, Journal of Oral Implantology 633

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

Effect of Splinting in Accuracy of Two Implant Impression Techniques
Assessment of the Stress Transmitted to Dental Implants Connected to Screw-Retained Bars Using Different Casting Techniques
Retentiveness of Various Luting Agents Used With Implant-Supported Prosthesis: An In Vitro Study
Role of rhBMP-2 and rhBMP-7 in the Metabolism and Differentiation of Osteoblast-Like Cells Cultured on Chemically Modified Titanium Surfaces
Coated vs Uncoated Implants: Bone Defect Configurations After Progressive Peri-implantitis in Dogs
Why Guided When Freehand Is Easier, Quicker, and Less Costly?
Advanced Platelet-Rich Fibrin: A New Concept for Cell-Based Tissue Engineering by Means of Inflammatory Cells
Flapless Alveolar Ridge Preservation Utilizing the ‘‘Socket-Plug’’ Technique: Clinical Technique and Review of the Literature
Implants Placed in the Nasopalatine Canal to Rehabilitate Severely Atrophic Maxillae: A Retrospective Study With Long Follow-up
Severe Mandibular Atrophy Treated With a Subperiosteal Implant and Simultaneous Graft With rhBMP-2 and Mineralized Allograft: A Case Report
Full-Mouth Rehabilitation of a Patient With Ectodermal Dysplasia With Dental Implants
The 2-Visit CAD-CAM Implant-Retained Overdenture: A Clinical Report
Assessment of Implant-Related Treatment With Edited Three-Dimensional Reconstructed Images From Cone-Beam Computerized Tomography: A Technical Note
Retrieval of a Separated Implant Screwdriver Fragment
Correction of Esthetic Complications of a Malpositioned Implant: A Case Letter
Fixed Partial Denture Treatment With Mini Dental Implants
Replacement of an Implant and Prosthesis in the Premaxilla Due to a Malposition and Prosthetic Failure: A Clinical Case Letter
A New Restorative Technique for the Perishing Implant Due to Abutment Screw Fracture
Fit of CAD/CAM Implant Frameworks: A Comprehensive Review

Journal of Oral Implantology December 2014