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Fig. 8. Change in RTVs according to the numbers of...

Fig. 8. Change in RTVs according to the numbers of mechanical loading cycles Fig. 8. Change in RTVs according to the numbers of mechanical loading cycles

Fig. 7. Schematic diagram for experimental procedu...

Fig. 7. Schematic diagram for experimental procedure Fig. 7. Schematic diagram for experimental procedure

Fig. 6. Specimen mounted in a 30°-angled steel ho...

Fig. 6. Specimen mounted in a 30°-angled steel holder Fig. 6. Specimen mounted in a 30°-angled steel holder

Fig. 5. Specimen mounted in a 30°-angled steel ho...

Fig. 5. Specimen mounted in a 30°-angled steel holder in ElectroPuls E1000 dynamic testing machine Fig. 5. Specimen mounted in a 30°-angled steel holder in ElectroPuls E1000 dynamic testing machine

Fig. 4. Tightening the abutment screw and measurin...

Fig. 4. Tightening the abutment screw and measuring the RTVs Fig. 4. Tightening the abutment screw and measuring the RTVs

Fig. 3. Implant assembly embedded in resin block :...

Fig. 3. Implant assembly embedded in resin block Fig. 3. Implant assembly embedded in resin block

Fig. 2. Schematic of test setup according to The I...

Fig. 2. Schematic of test setup according to The ISO 14801 recommendations Fig. 2. Schematic of test setup according to The ISO 14801 recommendations

Fig. 1. Cone connection combined with octalobular ...

Fig. 1. Cone connection combined with octalobular index (Octatorx) Fig. 1. Cone connection combined with octalobular index (Octatorx)

About this article : Removal torque pattern of a c...

Benjaboonyazit, K., Chaijareenont, P. & Khongkhunthian, P. Removal torque pattern of a combined cone and octalobule index implant-abutment connection at different cyclic loading: an in-vitro experimental study. Int J Implant Dent 5, 1 (2019). https://doi.org/10.1186/s40729-018-0154-2 Download citation Received: 17 September 2018 Accepted: 20 December 2018 Published: 14 Jan...

Rights and permissions : Removal torque pattern of...

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were m...

Ethics declarations : Removal torque pattern of a ...

Not applicable. Not applicable. Kanyarin Benjaboonyazit, Pisaisit Chaijareenont, and Pathawee, Khongkhunthian declare that they have no competing interests. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Author information : Removal torque pattern of a c...

Center of Excellence for Dental Implantology, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand Kanyarin Benjaboonyazit Department of Prosthodontics, Faculty of Dentistry, Chiang Mai University, Chiang Mai, Thailand Pisaisit Chaijareenont Center of Excellence for Dental Implantology, Faculty of Dentistry, Chiang Mai University, Suthep, A. Muang, Chiang Mai, 50200, Thailand Pat...

Acknowledgements : Removal torque pattern of a com...

The authors sincerely thank Mr. Anucharte Srijunbarl, Dental Material Research Center, Faculty of Dentistry, Chulalongkorn University for his assistance in the experimental part, Dr.Thanapat Sastraruji, Dental Research Center, Faculty of Dentistry, Chiang Mai University for his help in the meteorological data analysis and Dr. M. Kevin O Carroll, Professor Emeritus of the University of Mississippi ...

References : Removal torque pattern of a combined ...

Khraisat A, Abu-Hammad O, Dar-Odeh N, Al-Kayed AM. Abutment screw loosening and bending resistance of external hexagon implant system after lateral cyclic loading. Clin Implant Dent Relat Res. 2004;6:43–164. Guzaitis KL, Knoernschild KL, Viana MAG. Effect of repeated screw joint closing and opening cycles on implant prosthetic screw reverse torque and implant and screw thread morphology. J Pros...

References : Removal torque pattern of a combined ...

Cibirka RM, Nelson SK, Lang BR, Rueggeberg FA. Examination of the implant-abutment interface after fatigue testing. J Prosthet Dent. 2001;85:268–75. Khraisat A, Hashimoto A, Nomura S, Miyakawa O. Effect of lateral cyclic loading on abutment screw loosening of an external hexagon implant system. J Prosthet Dent. 2004;91:326–34. Delben JA, Gomes EA, Barao VA, Assuncao WG. Evaluation of the eff...

References : Removal torque pattern of a combined ...

Maeda Y, Satoh T, Sogo M. In vitro differences of stress concentrations for internal and external hex implant-abutment connections: a short communication. J Oral Rehabil. 2006;33:75–8. Ma T, Nicholls JI, Rubenstein JE. Tolerance measurements of various implant components. Iny J Oral Maxillofac Implants. 1997;12:371–5. Merz BR, Hunenbart S, Belser UC. Mechanics of the implant-abutment connect...

References : Removal torque pattern of a combined ...

Pjetursson BE, Asgeirsson AG, Zwahlen M, Sailer I. Improvements in implant dentistry over the last decade: comparison of survival and complication rates in older and newer publications. Int J Oral Maxillofac Implants. 2014;29(Suppl):308–24. Jung RE, Pjetursson BE, Glauser R, Zembic A, Zwahlen M, Lang NP. A systematic review of the 5-year survival and complication rates of implant-supported sing...

Abbreviations : Removal torque pattern of a combin...

Removal torque values

Conclusion : Removal torque pattern of a combined ...

According to the conditions for the fatigue test set out in ISO 14801:2007, the RTVs of the combined cone and octalobule index reduced significantly after 50,000 cycles and did not change significantly until 2,000,000 cycles.

Discussion : Removal torque pattern of a combined ...

In addition, further studies are suggested to examine the relation between the settling value [38] and the preload value of the screw. It would be helpful for evaluating the stability of the implant-abutment connection after functional loading. The decreasing pattern of RTVs after cyclic loading was specific to the design of the implant-abutment connection, so more studies are recommended in other...

Discussion : Removal torque pattern of a combined ...

Tzenakis et al. [42] reported that retightening of the screw is strongly recommended, but the appropriate timing of retightening is still not clear. Cho et al. [39] recommended retightening abutment screws in the early stage of functional loading, at the first week in vivo, in internal type implants because they found no significant difference in RTVs between 20,000 and 100,000 cycles of loading...

Discussion : Removal torque pattern of a combined ...

Although the reduction in RTVs was observed after mechanical cyclic loading, no screw loosening occurred after 2,000,000 cycles of loading, which it assumed represents 3 years of function in worse scenario setting according to ISO 14801 in vivo [23]. Our study presents similar results to those of Binon and McHugh, who reported that the 30-N-cm insertion torque can maintain screw-joint stabilit...

Discussion : Removal torque pattern of a combined ...

From the study, the RTVs of the control group, which was left unloaded for 10 min after second tightening decreased 7.78% from the tightening torque. Previous studies have shown a 2 to 10% loss of screw preload [21]. These results can be explained by the settling effect as follows [16]. Firstly, the tightening torque is used to overcome the friction of the contacting metal surface connection [32...

Results : Removal torque pattern of a combined con...

The RTV data were normally distributed (Shapiro-Wilk test). The mean RTVs (N cm) of all groups are shown in Table 1. The RTVs in all groups decreased. The mean initial RTV of the control group was 27.67 N cm, a decrease of 7.78% compared to the insertion torque. After mechanical cyclic loading, all experimental groups from 50,000 to 2,000,000 cycles of loading showed significant decreases i...

Materials and methods : Removal torque pattern of ...

Statistical analysis was performed using one-way ANOVA for the overall effect of the numbers of mechanical loading cycles on the RTVs of the abutment screw as well as the post hoc Tukey’s HSD test SPSS 20 (IBM SPSS, Chicago, IL, USA) was used, and differences at P 

Materials and methods : Removal torque pattern of ...

This study was conducted in accordance to the international standard fatigue test (ISO 14801:2007) for endosseous dental implants in vitro (Fig. 2). Eighty-four implants (PW Plus implant system, PW Plus Company) were prepared, which had a diameter of 3.75 mm and a length of 10 mm, with the Octatorx-cone implant-abutment connection. All were embedded in individual epoxy resin blocks (Chockfast ...

Background : Removal torque pattern of a combined ...

Bickford has explained how the screw is loosened in two stages [19]. Firstly, an external force causes micromovement and slipping between the abutment screw thread and the implant, decreasing the screw preload. Secondly, if the preload value falls below a critical level, and the external force exceeds the joint separating force, then screw loosening occurs. Consequently, the higher the preload val...

Background : Removal torque pattern of a combined ...

The occlusal force does not load only on the screw. The internal conical connection interface also helps to transfer and distribute the loading force to the implant [13]. The axial compressive component of occlusal force during oral function causes axial displacement of the abutment to the implant connection, increasing the frictional resistance and screw joint stability of the dental implant [7, ...

Background : Removal torque pattern of a combined ...

Dental implant placement has shown high survival and success rates [1, 2]. According to one study, the overall 5-year prosthetic survival rate for implant treatment has increased from 93.5 to 97.1% during the past 10 years [1]. Despite the high survival rate of implants, technical complications, such as screw loosening, are frequently reported [1,2,3]. The 5-year complication rate for screw loos...

Abstract : Removal torque pattern of a combined co...

Despite the high survival rate of dental implants, screw loosening is frequently reported. Screw loosening can cause a misfit of the implant-abutment connection leading to peri-implantitis or abutment screw fracture. Therefore, studies about related factors and mechanism of screw loosening are needed. The aim of this study was to evaluate the decreasing pattern of removal torque values (RTVs) of a...

Wedharan: tatalaksana sekrup penyangga implant yan...

Wedharan Komplikasi lumrah dari prostetik implant adalah komplikasi dengan komponennya. Sekrup penyangga menghubungkan bagian abutment ke piranti dan dapat patah karena beban fungsional oklusal. Ketika menyiapkan perawatan pasien penderita fraktur sekrup penyangga, dokter harus mengambil radiografi untuk memastikan kualitas dukungan tulang pendukung implant. Lubang sekrup piranti harus disiram...

Conclusion: management of a fractured implant abut...

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: management of a fractured implant abut...

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 : management of a fractured implant a...

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...