Figure 2. ture. Temperature rise at 30 s: bone level 3.3 mm > bone level 4.1 mm > Straumann regular neck 3.3 mm = Astra 3.5 mm = Straumann regular neck 4.8 mm. (b) Temperature rise when instrumenting with the Satelec ultrasonic device with cooling. The horizontal dotted line denotes the assumed critical rise in temperature. Temperature rise at 30 s: bone level 3.3 mm =â...
Figure 1. Implant embedded in epoxy resin with thermocouple at the outer surface.
Figure 1. Implant embedded in epoxy resin with thermocouple at the outer surface.
Meisberger, E.W., Bakker, S.J.G. & Cune, M.S. Temperature rise during removal of fractured components out of the implant body: an in vitro study comparing two ultrasonic devices and five implant types. Int J Implant Dent 1, 7 (2015). https://doi.org/10.1186/s40729-015-0008-0
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Received: 19 December 2014
Accepted: 02 March 2015
Published: 20 March 2015
DOI: https://doi.org/10.1...
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0), which permits use, duplication, adaptation, distribution, and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and in...
This research was made possible by the support of the authors’ institutions. Eric W Meisberger, Sjoerd JG Bakker and Marco S Cune declare that they have no competing interests.
EM and SB carried out the experiment. MC participated in the design of the study and performed the statistical analysis and helped to draft the manuscript. All authors read and approved the final manuscript.
University Medical Center Groningen, Center for Dentistry and Oral Hygiene, Department of Fixed and Removable Prosthodontics and Biomaterials, The University of Groningen, Gebouw 3216, kamer 206, A. Deusinglaan 1, 9713 AV, Groningen, The Netherlands
Eric W Meisberger, Sjoerd J G Bakker & Marco S Cune
Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, St. Antoniu...
The input of Prashant K. Sharma PhD, material scientist of the Department of Biomedical Engineering (Kolff Institute) of the UMC Groningen is greatly appreciated for his help interpreting the data. Michael Kars, DDS assisted during the collection of the data.
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It is concluded from this in vitro study that heat accumulation and transfer is dependent on the type of ultrasonic device, the use of coolant, and the implant type. The highest rise in temperature is seen when using the Satelec device without coolant on the smaller diameter implants. The EMS device causes limited rise in temperature when used without coolant for less than 10Â s, but presumably de...
Cooling proves effective for both systems, increasing the outer implant temperature by an acceptable 1°C to 3°C during continued instrumentation; however, as already stated, the spray will blur the vision of the operator.
One would expect the temperature to drop immediately after cessation of instrumentation and cooling, but the peak temperature is reached some seconds later for all experimenta...
The degree to which a material is able to transfer heat is called thermal conductivity. It can be defined as the time rate of transfer by conduction, through unit thickness, across unit area for unit temperature gradient. Differences in design and wall thickness of the implants used in the present study account for the variation in outcome (i.e., Straumann tissue level 4.8 implant less effected), ...
Several techniques have been described to deal with biomechanical complications. Acquiring adequate visibility and access is essential to success which will require the use of a dental microscope.
Several mechanical approaches to remove screw remnants can be employed. Generally, after identifying the position and condition of the screw remnant, it can be carefully removed using manual instrumenta...
The mean maximum rise in temperature (deltaTmax, all implants averaged per experimental condition) was reached at 30 to 40 s for all conditions. There was a significant difference for the Satelec device without cooling (mean 9.6, SD 1.6°C) and the EMS device without cooling (mean 4.3, SD 2.0°C) (t-test, t(28) = 4.7, p 
The results for all implants instrumented with the two tested ultrasonic devices, either with or without cooling, are presented in Figure 2a,b,c,d.
For the Satelec device, applied without coolant, only the temperature of the Straumann wide body regular neck implant never exceeded the 50 threshold. The data proved normally distributed (Kolmogorov-Smirnov test, p > 0.05). Analysis of variance ...
Two different types of commercially available ultrasonic devices, set at their lowest intensity for endodontic purpose, were used to instrument the internal portion of five different implant types, either with or without cooling. Intermittent anti-clockwise strokes were made, assuring that the tip was constantly in contact with the inner implant wall, as much as possible mimicking the motion that ...
The use of ultrasonic equipment under adequate magnification may facilitate removal. It generates heat. Instrumentation without a coolant likely increases the temperature of the implant body and could cause tissue damage, in particular be harmful to osseointegration. The use of a coolant could be effective, but compromises visibility considerably, hence increases the risk of damaging the internal ...
Complications in implant dentistry are generally divided into biological and mechanical complications. Mechanical complications include fracture of the implant body or prosthetic components such as chipping of ceramic material as well as loosening or fracture of implant abutments or fixation screws. This has a documented prevalence of 6 to 13% and 0.4 to 2% respectively after 5Â years [1-7].
With...
Ultrasonic instrumentation under magnification may facilitate mobilization of screw remnants but may induce heat trauma to surrounding bone. An increase of 5°C is considered detrimental to osseointegration. The objective of this investigation was to examine the rise in temperature of the outer implant body after 30 s of ultrasonic instrumentation to the inner part, in relation to implant type, t...
4. Strength
Minamizato et al investigated the compressive strength of the blade type of zirconia dental implants with tunnels drilled by laser process, and found that specimens with tunnels showed lower compressive strength (237 kg/mm2) than specimens without tunnels (371.5 kg/mm2). They concluded that zirconia blades had adequate strength in occlusion.
Kohal et al evaluated the frac...
Conclusions
A fractured abutment screw of a crown supported by an endosseous implant is an unhappy complication. The fragment retained in the fixture can be retrieved with a festooned #557 latch slow-speed burr set in reverse torque. Once the fragment is loosened and advanced coronally, a clockwise-turning #33 1/3 burr is touched to the fragment side to completely remove it. Care is taken n...
Discussion
A common complication of implant prosthetics is with components. The abutment screw connects the abutment to the fixture and can fracture under occlusal functional load.
In preparation for treatment of a patient presenting with an abutment screw fracture, a radiograph should be taken to ensure osseous support quality of the supporting implant. The fixture screw hole should be flush...
Introduction
Dental implants have been a life-enhancing modality for partially and completely edentulous patients. Implants can successfully support a cemented or screw-retained single crown. However, this modality is not without complications: A fractured abutment screw may occur when the prosthesis is under functional cyclic loading. The abutment screw may be overloaded and fracture, leaving th...