Konusları Farklı Sonlu Hareketli Bölümlü Protezlerde Fotoelastik Stres Analizi

Sonu serbest biten hareketli bölümlü protezler[HBP] sert ve yumuşak destek doku üzerinde stresesebep olabilir ve bu stres zararlı etkilere yol açabilir.Bu çalışmanın amacı 3 boyutlu fotoelastik stres analizyöntemiyle farklı taper açılı konik tutuculu teleskopiksonu serbest biten HBP lerin ve kroşe tutuculuHBP’nin dişsiz alanlarında ve destek diş etrafındakialveol karşılaştırılmasıdır.Otuz adet periodontal mebranı ve mukozası olansonu dişsiz sonlanan fotoelastik mandibular model 5gruba ayrıldı. Beş farklı HBP; kroşe tutuculu, Mezial[M] ve distal [D] 2°, M ve D 4°, M 4° D 2° ve M 2°D 4° olacak şekilde dört adet farklı konik açılıteleskopik HBP olarak hazırlandı. Bu protezlerüzerine dikey ve eğik 50 Newtonluk kuvvetler tektaraflı noktalarının (A. B, C,…G) frinç değerleri (N) olarakölçüldü, Elde edilen değerler Kruskal Wallis ve Mann

Anahtar Kelimeler:

Teleskopik protez, fotoelasticstres, distal uzantılı, konus kuron, eğik kuvvet

PHOTOELASTIC STRESS ANALYSIS OF DISTAL EXTENSION REMOVABLE PARTIAL TELESCOPIC DENTURES WITH DIFFERENT CONICAL CROWNS

Distal extension removable partial denture(RPD) can cause stress on supporting hard tissues,which may lead to harmful effects. The purpose of thisstudy is to investigate the pattern of these stressesoverthe residual alveolar ridge and alveolar bone aroundthe abutment teeth by distal extension conical crownretaineddifferent taper angles usingphotoelectric stress analysis.Thirty distal extension photoelastic mandible modelswith simulated periodontal ligaments and mucosawere divided into five groups. Vertical and oblique5 0 N loading forces were applied over the dentures.These dentures involved one claps denture and fourCCRTDs that conical crowns were planned mesial (M)and distal (D) 2°, M and D 4°, M 4° D 2° and M 2°D 4°. Fr i n g e smeasurement points (A, B,C,..G) were measured andthe data were evaluated by use Kruskal-Wallis andMann-Whitney test. While the stress on the RPD withclaps was concentrated on the point C where the distalabutment teeth and residual ridge meet, it wasconcentrated on the apex of abutment teeth in theCCRTDs.The significantly at point B, and under vertical loading atpoints A and C.Significant changes were observed between the pointsA, C, D and F in the second denture, points C and G inthe 3th, and B; in the 5th, unlike the points in the 1stand4thdentures

Keywords:

Telescopic denture, photoelastic stress, distal extension, conical crown, oblique load,

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1. Kuzmanovic DV, Payner GT, Purton DG. Distal implant modify the Kennedy classification of removable partial denture: A clinical report. J Prosthet Dent 2004; 92:8-11.
2. Kratochvill FJ, Caputo AA . Photoelastic analysis of pressure on teeth and bone supporting removable partial dentures. J Prosthet Dent 1974; 32:52-61.
3. Myers RE, Pfeifer DL, Mitchell DL, Peleu GB. A photoelastic study of rests on solitary abutmentsfor distal-extension removable partial dentures. J Prosthet Dent 1986;56: 702-707.
4. Aras MA. Extracronal direct retainers for distal extension removable partial denture. The J Indian Prosthodontic Society 2005; 5:65 -71.
5. Chou TM, Caputo AA, Moore DJ, et al. Photoelastic analysis and comparison of force - transmission characteristics of intracoronal attachments with clasp distal-extension removable partial dentures. J Prosthet Dent 1989; 62:313-319.
6. Fermandes CP, Glantz PJ, Sevensson SA, et al . Reflection photoelasticity: a new method for studies of clinical mechanics in prosthetic dentistry. Dental Materials 2003; 19:106-117.
7. Güngör MA, Artunç C, Sonugelen M. Parameters affecting retentive force of conus crowns Oral Rehabil 2004; 31: 271-277.
8. Akagawa Y, Seo T, Ohkawa S, et al. A new telescopic crown system using a soldered horizontal pin for removable partial dentures. J Prosthet Dent 1993; 69:228-231.
9. Güngör MA, Artunç C, Sonugelen M, et al. The evaluation of the removal force on the conus crowned telescopic prostheses with the finite element analysis. J Oral Rehabil 2002; 29:1069-1075.
10. Minagi S, Natsuaki N, Nishigawa G, et al. New telescopic crown design for removable partial dentures. J Prosthet Dent 1989; 81:684-68.
11. Labaig C, Marco R, Fons A, et al. Biodynamics of attachments used in overdentures : Experimental analysis with photoelasticity. Quintessence Int 1997; 28:183-190.
12. Ochia TK, Ozawv S, Caputo AA, et al. Photoelastic stress analysis of implant -tooth connected prostheses with segmented and nonsegmented abutments. J Prosthet Dent 2003; 89:495-502.
13. Asundi A, Kishen A. A strain gauge and photoelastic analysis of in vivo strain and in vitro stress distribution in human dental supporting structures. Archives of Oral Biology 2000; 45:543-550.
14. JW, Rile WF. Experimental Stress Analysis (3 th ed). McGraww-Hill, Eng 1991; pp 453 -461.
15. Loney RW, Kotowicz WE, McDowell GC. Three-dimensional photoelasti c stress anlysis of the ferrule effect in cast post and cores. J Prosthet Dent1990; 63:506-512.
16. Hearn EJ. Photoelasticity(Merrow Technical Library Practical Science) (7 th ed.). Merrow, Eng 1971; pp 34-37.
17. Itoh H, Caputo AA, Wylie R, et al. Effects of periodontal and fixed splinting on load transfer by removable partial dentures. J Prosthet Dent 1998; 79:465-471.
18. Reitz PV, Sanders JL, Caputo AA. A photoelastic study ofa split palatal major connector. J Prosthet Dent 1984;51(1):19-23.
19. Reitz PV, Caputo AA. A photoelastic study of stress distribution by a mandibular split major connector. J Prosthet Dent 1985; 54(2):220 - 225.
20. Thayer HH, Caputo A A. Photoelastic stress analysis of overdenture attachments. J Prosthet Dent 1980; 43(6):611-617.
21. White JT. Visualization of stress and strain related to removable partial denture abutments. J Prosthet Dent 1978; 40(2):143-151.
22. White SN, Caputo A A. Effect of cantilever length on stress transfer by implantsupported prostheses. J Prosthet Dent1994; 71(5):493-499.
23. Wylie RS, Caputo AA. Fixed cantilever splints on teeth with normal and reduced periodontal support. J Prosthet Dent 1991; 66:737-742.
24. Saıto M, Mıura Y, Notanı K, et al. Stress dstrubution of abutments and base displacement with precision attachment and telescopic crown retained removable partial denteres. J Oral Rehabil 2003;30:482- 487.
25. Ko SH, McDowell GC, Kotowicz WE. Photoelastic stress analysis of mandibular removable partial dentures with mesial and distal occlusal rests. J Prosthet Dent 1986; 56(4):454-460.
26. Kramprich M. İmplant dayanıklı bir teleskop protezin yenilenmesi. Quintessence 2001; 12 (3):65 72.
27. McArthur DR. Canines as removable partial denture abutments. Part II: Rest and undercut location for retainers. J Prosthet Dent 1986; 56(4):445-450.
28. Perel ML. Telescope dentures. J Prosthet Dent 1973; 29(2): 151-156.