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Retention Evaluation of PEEK Telescopic Attachment in Two Implants Supported Palateless Maxillary Overdenture. An In-vitro Study

Balen H. Qadir*, Kawan S. Othman*

*Department of Prosthodontics, College of Dentistry, Sulaimani University, Sulaimani, Iraq.

Submitted: 19/03/2020; Accepted: 19/05/2020; Published 01/12/2020



Objective: The aim of this study is to evaluate the effect of different positions of two dental implants with polyether ether ketone (PEEK) telescopic attachment on the Retention of palateless maxillary overdenture.          

Methods: Three edentulous maxillary models were fabricated from cold-cure polymethyl methacrylate resin. Each Model has received two implants as follows: Model 1 (one in each canine region), Model 2 (in right canine and left first premolar area), and Model 3 (in right canine and left second premolar area). One Palateless maxillary denture was constructed over each Model. Ready-made PEEK telescope attachments corresponding to implant abutments were embedded in the inner surface of these overdentures. Initial anterior, posterior, and central retention values of overdentures were estimated and compared with the Retention after 540 cycles of insertion and removal using a digital force gauge.      

Results: The highest initial anterior retention value was recorded with Model 1, followed by Model 2 and then Model 3 (8.080, 7.460, and 6.980 N), respectively. On the other hand, the highest posterior and central retention values were recorded for Model 3 (11.060 and 10.680 N), and the lowest value was with Model 1 (9.18 and 9.660 N). The highest loss of secondary retention value was recorded with central retention value (24%), then anterior retention value (19%), and the lowest was recorded with posterior retention value (13%).  

Conclusions: The implant location and distribution affect the retention value of palateless maxillary overdenture. Continuous insertion and removal of the prosthesis for daily hygiene practice lead to decreases in the retention values.


Keywords: Overdenture, Attachment, PEEK telescopic attachment, Retention.                                                                                                                                                                                              Full Article - PDF                                                                                                                                                                                                                                   


1. Doundoulakis Jh, Eckert Se, Lindquist Cc, Jeffcoat Mk. The implant-supported overdenture as an alternative to the complete mandibular denture. J Am Dent Assoc. 2003;134(11):1455-8.
2. Kiener P, Oetterli M, Mericske E, Mericske-Stern R. Effectiveness of maxillary overdentures supported by implants: maintenance and prosthetic complications. Int J Prosthodont. 2001;14(2):133- 40.
3. Sadowsky SJ, Zitzmann NU. Protocols for the Maxillary Implant Overdenture: a systematic review. Int J Oral Maxillofac Implants. 2016;31 Suppl:182-91.
4. Giannakopoulos NN, Corteville F, Kappel S, Rammelsberg P, Schindler HJ, Eberhard L. Functional adaptation of the masticatory system to implant‐supported mandibular overdentures. Clin Oral Implants Res. 2017;28(5):529-34.
5. Slot W, Raghoebar GM, Vissink A, Meijer HJ. Maxillary overdentures supported by four or six implants in the anterior region; 1‐year results from a randomized controlled trial. J Clin Periodontol. 2013;40(3):303-10.
6. Mericske-Stern R, Oetterli M, Kiener P, Mericske E. A follow-up study of maxillary implants supporting an overdenture: clinical and radiographic results. Int J Oral Maxillofac Implants. 2002;17(5):678-86.
7. Peñarrocha-Oltra D, Candel-Martí E, Ata-Ali J, Peñarrocha-Diago M. Rehabilitation of the atrophic maxilla with tilted implants: review of the literature. J Oral Implantol. 2013;39(5):625-32.
8. Payne T, Graham A, Lownie JF, Van Der Linden WJ. Implant-supported prostheses in patients with Sjögren's syndrome: a clinical report on three patients. Int J Oral Maxillofac Implants. 1997;12 (5):679-85.
9. Strain JC. The influence of complete dentures upon taste perception. J Prosthet Dent. 1952;2(1):60-7.
10. Shannon IL, Terry JM, Nakamoto RY. Palatal coverage and parotid flow rate. J Prosthet Dent. 1970;24(6):601-7.
11. Petrović A. Speech sound distortions caused by changes in complete denture morphology. J Oral Rehabil. 1985;12(1):69-79.
12. Ferro K, Morgano S, Driscoll C. The glossary of prosthodontic terms. Ninth Edition. J Prosthet Dent. 2017;117(5S):1-105.
13. Chun Hj, Park Dn, Han Ch, Heo Sj, Heo Ms, Koak Jy. Stress distributions in maxillary bone surrounding overdenture implants with different overdenture attachments. J Oral Rehabil. 2005;32(3):193-205.
14. Prasad DK, Prasad DA, Buch M. Selection of attachment systems in fabricating an implant supported overdenture. J Dent Implant. 2014;4(2):176-181.
15. Langer A. Telescope retainers and their clinical application. J Prosthet Dent. 1980;44(5):516-22.
16. Stawarczyk B. Comparison of retention forces of different fabrication methods of co-cr crowns: pre- sintered and milled, cast and electroforming secondary crowns with different taper angles. Int J Dentistry Oral Sci. 2015;2(3):15-20.
17. Oleszek-Listopad J, Sarna-Bos K, Szabelska A, Czelej-Piszcz E, Borowicz J, Szymanska J. The use of gold and gold alloys in prosthetic dentistry– a literature review. Curr. Issues Pharm. Med. Sci. 2015;28(3):192-5.
18. Merk S, Wagner C, Stock V, Eichberger M, Schmidlin PR, Roos M, et al. Suitability of Secondary PEEK Telescopic Crowns on Zirconia Primary Crowns: The Influence of Fabrication Method and Taper. Materials. 2016;9(11). E908.
19. Skirbutis G, Dzingutė A, Masiliūnaitė V, Šulcaitė G, Žilinskas J. A review of PEEK polymer's properties and its use in prosthodontics. Stomatologija. 2017;19(1):19-23.
20. Emera RM, Altonbary GY, Elbashir SA. Comparison between all Zirconia, all PEEK, and zirconia-PEEK telescopic attachments for two implants retained mandibular complete overdentures: In vitro stress analysis study. J Dent Implant, 2019;9(1):24-29.
21. Stock V, Schmidlin PR, Merk S, Wagner C, Roos M, Eichberger M, et al. PEEK primary crowns with cobalt-chromium, Zirconia and galvanic secondary crowns with different tapers-A comparison of retention forces. Materials. 2016;9(3):E187.
22. ELsyad MA, Agha NN, Habib AA. Retention and stability of implant-retained mandibular overdentures using different types of resilient attachments: an in vitro study. Int J Oral Maxillofac Implants. 2016;31(5):1040-8.
23. ELsyad MA, Soliman TA, Khalifa AK. Retention and stability of rigid telescopic and milled bar attachments for implant-supported maxillary overdentures: an in vitro study. Int J Oral Maxillofac Implants. 2018;33(5):127-33.
24. Williams BH, Ochiai KT, Hojo S, Nishimura R, Caputo AA. Retention of maxillary implant overdenture bars of different designs. J Prosthet Dent. 2001;86(6):603-7.
25. El-Amier NM, Elsaih EAE, El-Motaiam HA, Al- Shahat MA. Effect of implant location on palateless complete overdenture Retention: Preliminary study. J Dent Implant. 2015;5(1):6-11.
26. El Mekawy N, Khalifa A, Abdualgabbar E. The influence of palatal coverage on the retention force and fatigue resistance of mini dental implant maxillary overdenture. J Oral Hyg Health. 2016;4(200):2332-0702.
27. Takayama M, Sato Y, Kitagawa N, Nakatsu M, Yamagaki K, Aoyagi K, et al. The Effect of Viscosity of Oral Moisturizers and Residual Ridge Form on the Retention Force of Maxillary Complete Dentures. JSM Dent. 2016;4(5):1077.
28. Gupta R, Luthra R, Mehta S. Comparative analysis of two border molding techniques and materials on maxillary complete denture retention-an in-vivo study. J Adv Med Dent Scie Res. 2015;3(4):109- 112.
29. Chung KH, Chung CY, Cagna DR, Cronin Jr RJ. Retention characteristics of attachment systems for implant overdentures. J Prosthodont. 2004;13(4):221-6.
30. ELsyad MA, Dayekh MA, Khalifa AK. Locator versus bar attachment effect on the Retention and stability of implant‐retained maxillary overdenture: an in vitro study. J Prosthodont. 2019;28(2):627-36.
31. Rutkunas V, Mizutani H, Takahashi H. Influence of attachment wear on Retention of mandibular overdenture. J Oral Rehabil. 2007;34(1):41-51.
32. Weaver JD. Telescopic copings in restorative dentistry. J Prosthet Dent. 1989;61(4):429-33.
33. Heckmann SM, Schrott A, Graef F, Wichmann MG, Weber HP. Mandibular two‐implant telescopic overdentures: 10‐year clinical and radiographical results. Clin Oral Implants Res. 2004;15(5):560-9.
34. Pigozzo MN, Mesquita MF, Henriques GEP, Vaz LG. The service life of implant-retained overdenture attachment systems. J Prosthet Dent. 2009;102(2):74-80.
35. El-Amier N, Elsaih E, Gibreel M, El-Motaiam H. Effect of Implant Location on Palateless Complete Overdenture Retention: an In Vitro Study. J Oral Maxillofac Res. 2018;30;9(3):e3.
36. Scherer MD, McGlumphy EA, Seghi RR, Campagni WV. Comparison of Retention and stability of two implant-retained overdentures based on implant location. J Prosthet Dent. 2014;112(3):515-21.
37. Michelinakis G, Barclay CW, Smith PW. The influence of interimplant distance and attachment type on the retention characteristics of mandibular overdentures on 2 implants: initial retention values. Int J Prosthodont. 2006;19(5):507-12.
38. Minagi S, Natsuaki N, Nishigawa G, Sato T. New telescopic crown design for removable partial dentures. J Prosthet Dent. 1999;81(6):684-8.
39. Kalin M, Zalaznik M, Novak S. Wear and friction behaviour of poly-ether-ether-ketone (PEEK) filled with graphene, WS2 and CNT nanoparticles. Wear. 2015;332:855-62.
40. Schubert O, Reitmaier J, Schweiger J, Erdelt K, Güth J-F. Retentive force of PEEK secondary crowns on Zirconia primary crowns over time. Clin Oral Investig. 2019;23(5):2331-8.

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