Journal of Oral Implantology June 2014 - (Page 259)

RESEARCH Assessment of the Correlation Between Insertion Torque and Resonance Frequency Analysis of Implants Placed in Bone Tissue of Different Densities Luiz Carlos Magno Filho, DDS, MSc Fabiano Ribeiro Cirano, DDS, MSc, PhD Fernando Hayashi, DDS, MSc, PhD Hsu Shao Feng, DDS, MSc, PhD Alexandre Conte, DDS, MSc Luciano Lauria Dib, DDS, MSc, PhD Marcio Zaffalon Casati, DDS, MSc, PhD* The primary stability of dental implants is fundamental for osseointegration. Therefore, this study aimed to assess the correlation between insertion torque (IT) and resonance frequency analysis (RFA) of implants placed in mandibles and maxillas of different bone densities. Eighty dental implants were placed in maxillas and mandibles, and IT and the implant stability quotient (ISQ) were measured at the time of implant insertion. Bone density was assessed subjectively by the Lekholm and Zarb index. The type I and II densities were grouped together (group A)as were the type III and IV densities (group B). The IT in group A was higher (Student t test, P ¼ .0013) than in group B (46.27 6 18.51 Ncm, 33.62 6 14.74 Ncm, respectively). The implants placed in group A showed higher ISQ (Student t test, P ¼ .0004) than those placed in group B (70.09 6 7.50, 63.66 6 8.00, respectively). A significant correlation between IT and the ISQ value was observed for group A (Pearson correlation test; r ¼ 0.35; P ¼ .0213) and for group B (r ¼ 0.37; P ¼ .0224). Within the limitations of this study, it was possible to conclude that there is a correlation between IT and RFA of implants placed in mandibles and maxillas of different bone densities. Key Words: insertion torque, dental implant, bone density, RFA INTRODUCTION P rimary stability achieved at the time of implant insertion is considered a relevant factor for the success of the case, and it is a basic prerequisite for osseointegration. Studies have shown that factors such as bone density, length, width, type of implant, and surgical technique may interfere in primary implant stability.1 On the other hand, secondary stability depends on the ossification obtained around the body of the implant.2 ˜ Paulista University, Sao Paulo, SP, Brazil. * Corresponding author, e-mail: mzcasati@gmail.com.br DOI: 10.1563/AAID-JOI-D-11-00183 The clinical measurement that assesses primary implant stability is insertion torque (IT). High IT indicates that the implant is well fixed and mechanically stable within the bone tissue.3 Although IT is important for assessing primary implant stability, resonance frequency analysis (RFA), which was developed more recently, enables improved capacity to monitor primary and secondary implant stability; this makes it possible to measure stability at the time of insertion as well as at any stage of osseointegration and prosthetic rehabilitation.4 A previous study sought to identify the minimum IT and ISQ values for the immediate or early loading of implants. However, because of its small sample size and unequal distribution of patients Journal of Oral Implantology 259

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

Controlled Early Inflammation and Bone Healing—Potential New Treatments
Zygomatic Implants: The Impact of Zygoma Bone Support on Biomechanics
A Comparative Study on Microgap of Premade Abutments and Abutments Cast in Base Metal Alloys
Topical Simvastatin Improves the Pro-Angiogenic and Pro-Osteogenic Properties of Bioglass Putty in the Rat Calvaria Critical-Size Model
Assessment of the Correlation Between Insertion Torque and Resonance Frequency Analysis of Implants Placed in Bone Tissue of Different Densities
Benefits of Rehabilitation With Implants in Masticatory Function: Is Patient Perception of Change in Accordance With the Real Improvement?
A Method for Fabrication of Implant-Supported Fixed Partial Dentures
Safe Sinus Lift: Use of Acrylic Stone Trimmer to Avoid Sinus Lining Perforation
The Effects of Sinus Membrane Pathology on Bone Augmentation and Procedural Outcome Using Minimal Invasive Antral Membrane Balloon Elevation
Cellular Responses to Metal Ions Released From Implants
A Two-Stage Surgical Approach to the Treatment of Severe Peri-Implant Defect: A 30-Month Clinical Follow-Up Report
Eight-Year Follow-Up of a Fixed-Detachable Maxillary Prosthesis Utilizing an Attachment System: Clinical Protocol for Individuals With Skeletal Class III Malocclusions
Active Implant Peri-Apical Lesion: A Case Report Treated Via Guided Bone Regeneration With a 5-year Clinical and Radiographic Follow-up
Flapless Implant Placement: A Case Report
Active Implant Periapical Lesions Leading to Implant Failure: Two Case Reports
A Review of Platelet Derived Growth Factor Playing Pivotal Role in Bone Regeneration
LETTER TO THE EDITOR
REVIEW OF CURRENT LITERATURE

Journal of Oral Implantology June 2014