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Effect of Locator and Telescopic Attachment on Retention value for Two-Piece and One-Piece Implant-Supported Palateless Maxillary Over Denture: An In-vitro study

kawan S. Othman*
*Department of Prosthodontics, College of Dentistry, University of Sulaimani, Sulaimani, Iraq.
Submitted: March 15, 2021, Accepted: April 27, 2021, Published: December 1, 2021.


Objective: This study aims to evaluate the effect of two different implant designs (one-piece dental implant and two-piece dental implant) with attachment systems on retention value in implant-supported palate less maxillary overdenture.  

MethodsTwo edentulous maxillary models were fabricated from cold-cure polymethyl methacrylate resin. Four implants were inserted for each model as follows: Model I (Four one-piece implants were inserted, two implants in the canine region and two implants in the second premolar region), while Model II (Four two-piece implants were inserted, two implants in the canine region and two implants in second premolar region). The maxillary denture was constructed over each model. In model I, four ready-made titanium telescopic attachments corresponding to implant abutments were embedded in the inner surface of the overdenture. In contrast, in model II, four locator attachments corresponding to implant abutments were embedded in the inner surface of the overdenture. Initial anterior, posterior, and central retention values of overdentures were recorded and compared with the retention after 540 and 1080 cycles of insertion and removal using a digital force gauge.      

ResultsStatistical analysis revealed significant differences in the initial, secondary and tertiary retention values for anterior, posterior, and central retentions for both models (higher values were recorded before insertion cycles). The higher anterior and central retention values were recorded in Model II (44.93 and 25.9) N respectively, on the other hand, the higher posterior retention value was recorded for Model I 23.3N.  

ConclusionsThe type of attachment affects the retention value of maxillary overdenture. Continuous insertion and removal of the prosthesis lead to a decrease in the retention values.                                                                                     

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



1. Visser A, Raghoebar GM, Meijer HJ. Implant- retained maxillary overdentures on milled bar suprastructures: a 10-year follow-up of surgical and prosthetic care and aftercare. Int J Prosthodont. 2009;22(2):181-92.
2. Mericske-Stern RD, Taylor TD, Belser U. Management of the edentulous patient. Clin Oral Implants Res. 2000;11(1):108-25.
3. Qadir BH, Othman KS. Retention Evaluation of PEEK Telescopic Attachment in Two Implants Supported Palateless Maxillary Overdenture. An In-vitro Study. Sulaimani Dent J. 2020;7(2):1-8.
4. Elsaih EA. Maxillary four Implants retained palateless overdenture with two arch distributions (preliminary report). Egypt Dent J. 2015;61(1):287-97.
5. Bernhart G, Koob A, Schmitter M, Gabbert O, Stober T, Rammels- berg P. Clinical success of implant-supported and tooth-implant-supported double crown-retained dentures. Clin Oral Investig 2012;16(4):1031–37.
6. ELsyad MA, Elhaddad AA, Khirallah AS. Retentive properties of O-ring and locator attachments for implant-retained maxillary overdentures: An in vitro study. J Prosthodont. 2016;27(6):568-78.
7. Trakas T, Michalakis K, Kang K, Hirayama H. Attachment systems for implant retained overdentures: A literature review. Implant Dent. 2006;15(1):24-34.
8. 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.
9. 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.
10. 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.
11. 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.
12. 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):10.4172/2332-0702.1000200.
13. Takayama M, Sato Y, Kitagawa N, Nakatsu M, Yamagaki K, Aoyagi K, et al. The Effect of Effect of Locator and Telescopic Attachment Sulaimani Dental J. December 2021 25 Viscosity of Oral Moisturizers and Residual Ridge Form on the Retention Force of Maxillary
Complete Dentures. JSM Dent. 2016;4(5):1077.
14. 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- 12.
15. Chung KH, Chung CY, Cagna DR, Cronin Jr RJ. Retention characteristics of attachment systems for implant overdentures. J Prosthodont. 2004;13(4):221-6.
16. 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.
17. Rutkunas V, Mizutani H, Takahashi H. Influence of attachment wear on Retention of mandibular overdenture. J Oral Rehabil. 2007;34(1):41-51.
18. 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.
19. 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.
20. 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. 

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