Papers by Keyword: Injection Molding Technique

Abstract: Objectives: Zirconia powder in nanometers can be fabricated into inter-joined abutment of detal implant system with the injection shaping technique. This study was to detect the resistance of inter-joined zirconia abutment with different angle loading for clinical applications. Materials and Methods: The inter-joined abutments were shaped with the technique of injection of zirconia powder in nanometers. Sixty 0sstem GSⅡ5.0mm×10mm implants were used with 30 zirconia abutments and 30 0sstem GSⅡtitanium abutments for fixation using 40N torque force. The loading applications included 90°, 30°, 0° formed by the long axis of abutments and pressure head of universal test machine. The fracture resistances of zirconia and titanium abutments were documented and analyzed. Results: The inter-joined zirconia abutments were assembled to the 0sstem GSⅡimplants succssfully. In the 90° loading mode, the fracture resistance of zirconia abutment group and titanium abutment group were 301.46±15.38N、736.36±120.10N respectively. And those in the 30°groups were 434.66±36.07N、1073.12±73.96N correspondingly. Significant difference in the two groups was found through T Test. No damage on the abutments of the two groups but S-shaped bending on the implants was found when the 0° loading was 1300~2000N. Conclusions: Through the assembly of Zirconia abutments and implants, all the components presented sufficient resistance acquired for the clinical application under loadings with different angle.

Abstract: Following the development of the thin-LCD, many researchers have improved the traditional backlighting module to make it thinner, lighter, and brighter which has already become the trend. The light guide plate is a very important component in backlighting module. Generally, the traditional light guide plate (LGP) is made of PMMA material. Injection molding technique is applied to fabricate the traditional LGP. In this research, Polydimethylsiloxane (PDMS) material was used to make the LGP, which was fabricated by using MEMS technique. In order to modify the traditional LGP, the micro prisms were constructed on the bottom surface of the PDMS LGP. Silicon mold was used to define the geometry of the micro-prism. Anisotropic etching technique was applied to fabricate the prism silicon mold. A liquid PDMS mixture was cast onto the prism silicon mold and the PDMS LGP was completed. White LED was utilized to be the light source of the PDMS LGP. After going through the illuminative test, PDMS LGP was demonstrated successfully of guide light function and its 77% of illuminative uniformity was achieved requirement of a general v-grooved light guide. The thickness of the PDMS LGP is easy to control and the PDMS is a heat-resistant and cheap material; therefore, the space and fabrication cost are saved. The field of MEMS has experienced rapid growth in the recent decade. In the future, the PDMS LGP can make displays thinner and brighter for thin-LCD applications.