The effect of environment (Dry and Natural Saliva) on clasp retention: In vitro study - Part I

ABSTRACT

Objective: The purpose of this study was to investigate the importance of environments (dry and wet) to dislodge the clasp. Materials and Methods: Mandibular test models with natural premolar and molar teeth were used to test four types of clasp (each 12) (Akers, rest plate Akers [RPA], half and half [H-H], and ring clasp) in dry and natural fresh saliva environments. Each clasp was pulled out 10 times with a crosshead speed of 10 mm/min and the force required to withdraw each was measured. Statistical Analysis Used: A paired sample t-test and Wilcoxon test were used. Results: There were significant differences between the dry and wet (natural fresh saliva) environment. However, while the mean of the environment for RPA and ring clasp type was significantly different, the H-H and Akers clasp type was not. Conclusion: The environment has an effect on dislodging the clasp but differs according to the type of clasp.

Key words:

Akers - clasp - environment - removable partial denture - retention - saliva

• REFERENCES

• 1 Mourshed B, Samran A, Alfagih A, Samran A, Abdulrab S, Kern M. Anterior Cantilever Resin-Bonded Fixed Dental Prostheses: A Review of the Literature. Journal of Prosthodontics 2016; DOI: Doi: 10.1111/jopr.12555.
• 2 Mourshed B, Al-Sabri FA, Qaed NA, Alaizari N, Al-Shamiri HM, Alfaqih A. Effect of clasp type and pullout location on clasp retention in different environment: In vitro study. Eur J Dent 2017; 11: 216-20
• 3 Phoenix RD, Cagna DR, DeFreest CF. Stewart's Clinical Removable Partial Prosthodontics. 4th ed. Chicago: Quintessence Publishing Co., Inc; 2013
• 4 Ahmad I, Sherriff M, Waters NE. The effect of reducing the number of clasps on removable partial denture retention. J Prosthet Dent 1992; 68: 928-33
• 5 Frank RP, Nicholls JI. A study of the flexibility of wrought wire clasps. J Prosthet Dent 1981; 45: 259-67
• 6 Sato Y. Clinical methods for adjusting retention force of cast clasps. J Prosthet Dent 1999; 82: 557-61
• 7 Marei MK. Measurement (in vitro) of the amount of force required to dislodge specific clasps from different depths of undercut. J Prosthet Dent 1995; 74: 258-63
• 8 Rodrigues RC, Ribeiro RF, de Mattos Mda G, Bezzon OL. Comparative study of circumferential clasp retention force for titanium and cobalt-chromium removable partial dentures. J Prosthet Dent 2002; 88: 290-6
• 9 Ahmad I, Waters NE. Value of guide planes in partial denture retention. J Dent 1992; 20: 59-64
• 10 Bridgeman JT, Marker VA, Hummel SK, Benson BW, Pace LL. Comparison of titanium and cobalt-chromium removable partial denture clasps. J Prosthet Dent 1997; 78: 187-93
• 11 Kim D, Park C, Yi Y, Cho L. Comparison of cast Ti-Ni alloy clasp retention with conventional removable partial denture clasps. J Prosthet Dent 2004; 91: 374-82
• 12 Arda T, Arikan A. An in vitro comparison of retentive force and deformation of acetal resin and cobalt-chromium clasps. J Prosthet Dent 2005; 94: 267-74
• 13 Firtell DN. Effect of clasp design upon retention of removable partial dentures. J Prosthet Dent 1968; 20: 43-52
• 14 Ikebe K, Morii K, Kashiwagi J, Nokubi T, Ettinger RL. Impact of dry mouth on oral symptoms and function in removable denture wearers in Japan. Oral Surg Oral Med Oral Pathol Oral Radiol Endod 2005; 99: 704-10
• 15 Sato Y, Abe Y, Yuasa Y, Akagawa Y. Effect of friction coefficient on Akers clasp retention. J Prosthet Dent 1997; 78: 22-7
• 16 Preetha A, Banerjee R. Comparison of artificial saliva substitutes. Trends Biomater Artif Organs 2005; 18: 178-86
• 17 Humphrey SP, Williamson RT. A review of saliva: Normal composition, flow, and function. J Prosthet Dent 2001; 85: 162-9
• 18 Slomiany BL, Murty VL, Piotrowski J, Slomiany A. Salivary mucins in oral mucosal defense. Gen Pharmacol 1996; 27: 761-71
• 19 Tabak LA. Structure and function of human salivary mucins. Crit Rev Oral Biol Med 1990; 1: 229-34
• 20 Khurshid Z, Najeeb S, Mali M, Moin SF, Raza SQ, Zohaib S. et al. Histatin peptides: Pharmacological functions and their applications in dentistry. Saudi Pharm J 2017; 25: 25-31
• 21 Khurshid Z, Zohaib S, Najeeb S, Zafar MS, Slowey PD, Almas K. Human saliva collection devices for proteomics: An update. Int J Mol Sci 2016; 17 pii E846
• 22 Khurshid Z, Naseem M, Sheikh Z, Najeeb S, Shahab S, Zafar MS. Oral antimicrobial peptides: Types and role in the oral cavity. Saudi Pharm J 2016; 24: 515-24
• 23 Edgar WM. Saliva and dental health. Clinical implications of saliva: Report of a consensus meeting. Br Dent J 1990; 169: 96-8
• 24 Bongaerts JH, Rossetti D, Stokes JR. The lubricating properties of human whole saliva. Tribol Lett 2007; 27: 277-87
• 25 LaVere AM. Clasp retention: The effects of five variables. J Prosthodont 1993; 2: 126-3
• 26 Carr AB, Brown DT. McCracken's Removable Partial Prosthodontics. 12th ed. St. Louis: Elsevier Mosby; 2013
• 27 Rantonen PJ, Meurman JH. Viscosity of whole saliva. Acta Odontol Scand 1998; 56: 210-4
• 28 Hatton MN, Levine MJ, Margarone JE, Aguirre A. Lubrication and viscosity features of human saliva and commercially available saliva substitutes. J Oral Maxillofac Surg 1987; 45: 496-9
• 29 Prinza JF, Wijka RA, Huntjensb L. Load dependency of the coefficient of friction of oral mucosa. Food Hydrocoll 2007; 21: 402-8
• 30 Schipper RG, Silletti E, Vingerhoeds MH. Saliva as research material: Biochemical, physicochemical and practical aspects. Arch Oral Biol 2007; 52: 1114-35