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http://dx.doi.org/10.4047/jap.2017.9.1.14

The influence of the number and the type of magnetic attachment on the retention of mandibular mini implant overdenture  

Lee, Eunjee (Department of Prosthodontics, College of Dentistry, Dankook University)
Shin, Soo-Yeon (Department of Prosthodontics, College of Dentistry, Dankook University)
Publication Information
The Journal of Advanced Prosthodontics / v.9, no.1, 2017 , pp. 14-21 More about this Journal
Abstract
PURPOSE. The aim of this study was to compare the retention of mini implant overdenture by the number, the type of magnetic attachment, and the directions of applied dislodging force. MATERIALS AND METHODS. The experimental groups were designed by the number and type of magnetic attachment. Twenty samples were tested with Magden implants. Each attachment was composed of the magnet assembly in overdenture sample and the abutment keeper in a mandibular model. Dislodging forces were applied to the overdenture samples (50.0 mm/min) in 3 directions. The loading was repeated 10 times in each direction. The values of dislodging force were analyzed statistically using SPSS at 95% level of confidence. RESULTS. The retentive force of group 2 was greater than that of group 1 in both types of attachment in every direction (P < .05). Oblique retentive force of flat type magnetic attachment was higher than that of cushion type attachment in both groups (P < .05). In group 1, oblique retentive force showed the highest and anterior-posterior retentive force showed the lowest value in both attachment types (P < .05). In group 2, both types of attachment showed the lowest retentive force with anterior-posterior direction of dislodging force (P <.05). CONCLUSION. Proper retentive properties for implant overdenture were obtained, regardless of the number and type of magnetic attachment. In both types of magnetic attachment, the greater retentive force was attained with more implants. Oblique retentive force of flat type magnetic attachment was greater than that of cushion type. Among all subgroups, anterior-posterior retentive force was the lowest among three different directions of dislodging force.
Keywords
Overdenture; Dental mini implants; Magnets; Precision attachment;
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1 Burns DR, Unger JW, Elswick RK Jr, Giglio JA. Prospective clinical evaluation of mandibular implant overdentures: Part II--Patient satisfaction and preference. J Prosthet Dent 1995; 73:364-9.   DOI
2 Gunne HS, Bergman B, Enbom L, Hogstrom J. Masticatory efficiency of complete denture patients. A clinical examination of potential changes at the transition from old to new denture. Acta Odontol Scand 1982;40:289-97.   DOI
3 Tarbet WJ, Boone M, Schmidt NF. Effect of a denture adhesive on complete denture dislodgement during mastication. J Prosthet Dent 1980;44:374-8.   DOI
4 Burns DR, Unger JW, Elswick RK Jr, Beck DA. Prospective clinical evaluation of mandibular implant overdentures: Part I-Retention, stability, and tissue response. J Prosthet Dent 1995;73:354-63.   DOI
5 Seo M, Cho IH. A comparative study on the retention of implant overdenture according to the shape and the number of magnetic attachment. MS Thesis, Department of prosthodontics, Colleges of Dentistry, Dankook University. 2007.
6 Mensor MC. Removable partial overdentures with mechanical (precision) attachments. Dent Clin North Am 1990;34:669-81.
7 Cune MS, de Putter C, Hoogstraten J. Treatment outcome with implant-retained overdentures: Part II--Patient satisfaction and predictability of subjective treatment outcome. J Prosthet Dent 1994;72:152-8.   DOI
8 Engquist B, Bergendal T, Kallus T, Linden U. A retrospective multicenter evaluation of osseointegrated implants supporting overdentures. Int J Oral Maxillofac Implants 1988;3:129-34.
9 Gendusa NJ. Magnetically retained overlay dentures. Quintessence Int 1988;19:265-71.
10 Behrman SJ. The implantation of magnets in the jaw to aid denture retention. J Prosthet Dent 1960;10:807-41.   DOI
11 Schmitz JF. Measurement of the efficiency of the platinumcobalt magnetic implant. J Prosthet Dent 1966;16:1151-8.   DOI
12 Connor RJ, Svare CW. Proplast-coated high-strength magnets as potential denture stabilization devices. J Prosthet Dent 1977;37:339-43.   DOI
13 Freedman H. Magnets to stabilize dentures. J Am Dent Assoc 1953;47:288-97.   DOI
14 Sagawa M, Fujimura S, Togawa M, Yamamoto H, Matsuura Y. New material for permanent magnets on a base of Nd and Fe. J Appl Phys 1984;55:2083-7.   DOI
15 Strnat KJ. The hard-magnetic properties of rare earth-transition metal alloys. IEEE Trans Magnet 1972;8:511-6.   DOI
16 Highton R, Caputo AA, Kinni M, Matyas J. The interaction of a magnetically retained denture with osseointegrated implants. J Prosthet Dent 1988;60:486-90.   DOI
17 Walmsley AD, Brady CL, Smith PL, Frame JW. Magnet retained overdentures using the Astra dental implant system. Br Dent J 1993;174:399-404.   DOI
18 Walmsley AD. Magnetic retention in prosthetic dentistry. Dent Update 2002;29:428-33.   DOI
19 Flanagan D, Mascolo A. The mini dental implant in fixed and removable prosthetics: a review. J Oral Implantol 2011;37: 123-32.   DOI
20 Tu CY, Lin LD, Wang TM, Hsu YC, Lee MS. Using mini dental implants to improve the stability of an existing mandibular complete denture in a patient with severe ridge resorption. J Prost Impl 2012;1:48-52.
21 Morneburg TR, Proschel PA. Success rates of microimplants in edentulous patients with residual ridge resorption. Int J Oral Maxillofac Implants 2008;23:270-6.
22 Gillings BR. Magnetic retention for complete and partial overdentures. Part I. J Prosthet Dent 1981;45:484-91.   DOI
23 Riley MA, Walmsley AD, Harris IR. Magnets in prosthetic dentistry. J Prosthet Dent 2001;86:137-42.   DOI
24 Jonkman RE, Van Waas MA, Kalk W. Satisfaction with complete immediate dentures and complete immediate overdentures. A 1 year survey. J Oral Rehabil 1995;22:791-6.   DOI
25 Gillings BR. Magnetic denture retention systems: inexpensive and efficient. Int Dent J 1984;34:184-97.
26 Prieskel HW. Precision attachments in prosthodontics. 2nd ed. Chicago; IL; USA Quintessence book, 1986, p. 191-241.
27 Lewandowski JA, White KC, Moore D, Johnson C. An investigation of two rare earth magnetic systems by measuring grip force and reseating force. J Prosthet Dent 1988;60:705-11.   DOI
28 Akaltan F, Can G. Retentive characteristics of different dental magnetic systems. J Prosthet Dent 1995;74:422-7.   DOI
29 Sarnat AE. The efficiency of cobalt samarium (Co5Sm) magnets as retention units for overdentures. J Dent 1983;11:324-33.   DOI
30 Ma PS, Shin SW. Three-demensional finite element analysis on the mandibular implant-supported overdentures depending upon the type of magnetic attachments and number of fixtures. MS Thesis, Department of prosthodontics, Graduate School of Clinical Dentistry, Korea University. 2005.
31 Thompson IM. Magnetism as an aid to a prosthetic problem. Br J Oral Surg 1964;2:44-6.   DOI
32 Gillings BR. Magnetic retention for dentures. Dent Outlook 1983;9:1-9.
33 Lim HW, Cho IH. A study on the changes in magnetic force of magnetic attachments for overdenture. MS Thesis, Department of Prosthodontics, College of Dentistry, Dankook University. 2014.