Influence of thickness and undercut of thermoplastic resin clasps on retentive force
Source abstract
Abstract
Thermoplastic resin clasps have been used for esthetic denture rehabilitation. However, details of the design of the clasps have never been thoroughly clarified. This study investigated the retentive forces of thermoplastic resin clasps for non-metal clasp dentures. The retentive forces of all thermoplastic resin clasps depended on the elastic modulus of each resin, undercuts, thickness, and widths of the tested. A clasp with more than 0.5 mm undercut and 1.0 mm thickness is needed for Valplast. Similarly, more than 0.25 mm undercut and 1.0 mm thickness and 0.5 mm undercut and 0.5 mm thickness are required for Estheshot and Reigning, respectively; thus, the recommended clasp arm thickness is 1.0 mm to 1.5 mm for Valplast and Estheshot and 0.5 mm to 1.0 mm for Reigning when the width of the retentive arm is 5.0 mm.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Dental Implant Techniques and Outcomes · Dental materials and restorations · Orthopaedic implants and arthroplasty
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (22)
Show source-provided references
1. 1) Katsumata Y, Hojo S, Hamano N, Hamano N, Watanabe T, Yamaguchi H, Okada S, Teranaka T, Ino S. Bonding strength of autopolymerizing resin to nylon denture base polymer. Dent Mater J 2009; 28: 409-418.10.4012/dmj.28.409 ↗
2. 2) Kaplan P. Flexible removable partial dentures: Design and clasp concepts. Dent Today 2008; 27: 120: 122-123.
3. 3) Goiato MC, Panzarini SR, Tomiko C, Luvizuto ER. Temporary flexible immediately removable partial denture: A case report. Dent Today 2008; 27: 114, 116.
4. 4) Takahashi Y, Hamanaka I, Shimizu H. Effect of thermal shock on mechanical properties of injection-molded thermoplastic denture base resins. Acta Odontol Scand 2012; 70: 297-302.10.3109/00016357.2011.600719 ↗
5. 5) Takabayashi Y. Characteristics of denture thermoplastic resins for non-metal clasp dentures. Dent Mater J 2010; 29: 353-361.10.4012/dmj.2009-114 ↗
6. 6) Hamanaka I, Takahashi Y, Shimizu H. Mechanical properties of injection-molded thermoplastic denture base resins. Acta Odontol Scand 2011; 69: 75-79.10.3109/00016357.2010.517557 ↗
7. 7) Kuwahara K, Nagahara F, Kitahara K, Wada M, Makimura K, Kimura M, Sakamaki H, Indou J, Ogura K, Kobayashi K. A case of using non-metal clasp partial denture for the patient with the metal allergy. Nihon Univ J Oral Sci 2004; 30: 134-139.
8. 8) Hirota M, Shimpo H, Suzuki Y, Ohkubo C. Influence of metal rest in a non-metal clasp denture on pressure distribution to soft tissure. Ann Jpn Prosthodont Soc 2012; 4: 193-200.10.2186/ajps.4.193 ↗
9. 9) Yoda N, Watanabe M, Suenaga H, Kobari H, Hamada T, Sasaki K. Biomechanical investigation of the “non-clasp denture” based on the load exerted on abutment teeth and under the denture base. Ann Jpn Prosthodont Soc 2012; 4: 183-192.10.2186/ajps.4.183 ↗
10. 10) ISO 1567:2005, Dentistry-Denture base polymers, International Organization for Standardization.
11. 11) Shimpo H. Effect of arm design and chemical polishing on retentive force of cast titanium alloy clasps. J Prosthodont 2008; 17: 300-307.10.1111/j.1532-849X.2007.00289.x ↗
12. 12) Kanki Y. A study on the fitness test for cast clasp. Tsurumi Univ Dent J 1993; 19: 211-226.
13. 13) Muraishi E. Retentive forces and fitting accuracy of repaired akers clasps using laser welding. Tsurumi Univ Dent J 2010; 36: 53-65.
14. 14) Parvizi A, Lindquist T, Schneider R, Williamson D, Boyer D, Dawson DV. Comparison of the dimensional accuracy of injection-molded denture base materials to that of conventional pressure-pack acrylic resin. J Prosthodont 2004; 13: 83-89.10.1111/j.1532-849X.2004.04014.x ↗
15. 15) Pronych GJ, Sutow EJ, Sykora O. Dimensional stability and dehydration of a thermoplastic polycarbonate-based and two PMMA-based denture resins. J Oral Rehabil 2003; 30: 1157-1161.10.1111/j.1365-2842.2003.01189.x ↗
16. 16) Sato Y, Tsuga K, Abe Y, Asahara S, Akagawa Y. Analysis of stiffness and stress in I-bar clasps. J Oral Rehabil 2001; 28: 596-600.10.1046/j.1365-2842.2001.00600.x ↗
17. 17) Frank RP, Nicholls JI. A study of the flexibility of wrought wire clasps. J Prosthet Dent 1981; 45: 259-267.10.1016/0022-3913(81)90386-3 ↗
18. 18) Yokoyama N, Machi H, Hayashi K, Uchida T, Ono T, Nokubi T.Physical properties of polyamide resin (nylon group) as a polymeric material for dentures: Part 2. Surface hardness and tensile strength. J N A D T 2004; 25: 87-92.
19. 19) Machi H, Hayashi K, Yokoyama N, Uchida T, Ono T, Nokubi T.Physical properties of polyamide resin (nylon group) as a polymeric material for dentures: Part 3. Flexural properties and fatigue characteristics. J N A D T 2004; 25: 93-99.
20. 20) Abuzar MA, Bellur S, Duong N, Kim BB, Lu P, Palfreyman N, Surendran D, Tran VT. Evaluating surface roughness of a polyamide denture base material in comparison with poly (methyl methacrylate). J Oral Sci 2010; 52: 577-581.10.2334/josnusd.52.577 ↗
21. 21) Pfeiffer P, Rosenbauer EU. Residual methyl methacrylate monomer, water sorption, and water solubility of hypoallergenic denture base materials. J Prosthet Dent 2004; 92: 72-78.10.1016/j.prosdent.2004.04.003 ↗
22. 22) Sano M, Ito K, Nomura A, Kohno S. Properties of thermoplastic polymers used for non-clasp dentures. J Jpn Soc Dent Prod 2009; 23: 28-34.