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EVALUATION OF RETENTION AND DEFORMATION OF BIO-HPP AND COBALT CHROMIUM AKER'S CLASP CONSTRUCTED BY TWO DIFFERENT METHODS - AN IN VITRO STUDY
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EVALUATION OF RETENTION AND DEFORMATION OF BIO-HPP AND COBALT CHROMIUM AKER'S CLASP CONSTRUCTED BY TWO DIFFERENT METHODS - AN IN VITRO STUDY
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EVALUATION OF RETENTION AND DEFORMATION OF BIO-HPP AND COBALT CHROMIUM AKER'S CLASP CONSTRUCTED BY TWO DIFFERENT METHODS - AN IN VITRO STUDY
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Journal Article
EVALUATION OF RETENTION AND DEFORMATION OF BIO-HPP AND COBALT CHROMIUM AKER'S CLASP CONSTRUCTED BY TWO DIFFERENT METHODS - AN IN VITRO STUDY
2021
Overview
Purpose: This study was aimed to evaluate the retentive forces and the clasp deformation of Bio-Hpp Aker's clasps and Cobalt-Chrome (Co-Cr) Aker's clasps constructed by CAD/CAM milling machine and by lost wax technique. Materials and Method: Twenty models were constructed by placing premolar tooth inside a rectangular stone block. Models were divided equally according to the clasp material into two groups. Group I for Bio-Hpp Aker's clasp and Group II for Cobalt-Chrome (Co-Cr) Aker's clasps, both groups I, II were subdivided according to method of clasp construction into group Ia for Bio-Hpp Aker's clasp constructed by CAD/CAM milling, group Ib for Bio-Hpp Aker's clasps constructed by lost wax technique (injection method (press)), group IIa for Cobalt-Chrome (Co-Cr) Aker's clasps constructed by CAD/ CAM milling, group IIb for Cobalt-Chrome (Co-Cr) Aker's clasps constructed lost wax technique. Each testing model and its clasp were mounted inside universal testing machine. Retention of each clasp was measured by applying withdrawal force to it using universal testing machine at pre-test (0 cycle) and after cycling intervals (360 cycles, 720 cycles, 1080 cycles and 1440 cycles) representing day of delivery, three, six, nine and twelve months follow up periods, deformation of the clasp after each cycle was recorded by measuring the distance (mm) between the clasp tips was conducted using a digital micrometer. The data were collected tabulated and statistically analyzed using 3-way-ANOVA test followed by pair-wise Tukey's post-hoc if showed significance. Results: Regarding retention: Retention mean values decreased significantly from baseline to 12 months evaluation time (p =< 0.0001 < 0.05) at both groups with loss of retentive forces in Co-Cr metal groups more than in Bio-Hpp groups. Both construction technique subgroups showed statistically significant decrease in retention mean values where loss of retention in lost wax subgroups was higher than milled subgroups. Regarding clasp deformation: Deformation was observed in both groups, however, Bio-Hpp milled group showed least deformation values followed by Bio-Hpp lost wax group, then Co-Cr milled and the highest deformation values was observed in the Co-Cr lost wax technique group. Clinical significance: Bio-HPP Akers' clasp material showed acceptable retention values with less deformation than Co-Cr clasp group CAD/CAM construction method is considered acceptable as an alternative to the traditional lost wax-technique.
Publisher
Nova Science Publishers, Inc
Subject
