Abstract

BOOKHAN, V; ARNOLD, S; DANNHEIMER, MFG  and  BALLYRAM, R. Comparison of two light guide tips used to photo-polymerize two dental composites. An in-vitro study. S. Afr. dent. j. [online]. 2019, vol.74, n.2, pp.67-72. ISSN 0375-1562.  http://dx.doi.org/10.17159/2519-0105/2019/v74no2a3.

INTRODUCTION: Manufacturer-made light guide (MMLG) tips of light emitting diodes (LEDs) are frequently damaged. Could custom-made light guide (CMLG) tips be suitable replacements? AIMS: 1.) To compare compressive fracture strengths of resin-based composite specimens photo-polymerized/ cured with a CMLG tip (acrylic-glass) and a MMLG tip (fibre-optic), used interchangeably on a poly-LED curing unit. 2.) To compare the costs of the CMLG tip and the MMLG tip METHODS: Two groups of 20 composite cylindrical specimens (4 mm diameter, 4 mm length) were made in teflon moulds. Each light tip cured ten micro-hybrid Z100^TM and ten nano-filled Filtek^TM Supreme XTE specimens, (60 seconds each side). Storage was in distilled water at 37°C (±2°C) for 48 hours. Compressive strength testing (MPa) was done at a crosshead speed of 0.5 mm/min using a Bencor Multi-T device in an Instron machine. Student's paired t-test and intra-class correlation coefficients (ICC) were applied for analysis and agreement testing. Relative costs of both light guide tips were determined and compared RESULTS: Only the Z100^TM groups showed significant differences in compressive fracture strength (p = 0.001). The CMLG tip was cheaper DISCUSSION: The CMLG tip was preferred for photo-curing Filtek^TM Supreme XTE resin based composite. The MMLG tip was preferred for photo-curing Z100^TM resin based composite CONCLUSIONS: The CMLG was suitable for curing preclinical Z100^TM and Filtek^TM Supreme XTE resins and was substantially cheaper than the MMLG tip

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