Therefore, the novality of this research is that it combines the rigidity of chrome-cobalt skeleton partial denture framework with its good support and better load distribution, together with the superior esthetic quality of the thermoelastic (Versacryl) retentive arm. Another important advantage of the thermoelastic retentive arm is that it has an internal memory to return to its original position as compared to the cast clasp, which usually becomes fatigued after about 500 times of insertion and removal, as reported by Tokue et al (2013).
The present study revealed superior results regarding the amount of bone loss, density and gingival condition around the terminal abutment, and implant with the use of the thermoelastic resin (Versacryl) clasp. Besides, this type of clasp arm can be easily adjusted by just putting it in warm water which gives confidence and comfort to the patient, unlike the metal clasp arm. Another important advantage of the Versacryl clasp is that, if broken, it can be easily replaced, as it chemically bonds to the old acrylic resin. In addition, thermoelastic resin clasps are also very hygienic and do not easily stain as they are non-porous and easily cleaned preventing the adherence of debris to the clasp.
Conclusions
From the results of the present study, it can be concluded that:
1) The use of the thermoelastic (Versacryl) clasp, with its superior properties, is better accepted by the patients, regarding esthetics, retention and efficiency.
2) Both the implants and the abutment teeth reacted more favorably with the use of Versacryl clasps
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