Study on different thickness and chromatics of various opaques / 华西口腔医学杂志

ABSTRACT

<p><b>OBJECTIVE</b>To study the effect existed in the course of adopting different thickness and chromatics of various opaques so that a good methods can be provided for clinical care in prosthodontics.</p><p><b>METHODS</b>A model of using the thin plastic paper to control the ceramic thickness was applied in this test. The data of chromaticity was measured by TC-PIIG auto color difference meter and its results was processed by computer.</p><p><b>RESULTS</b>The value of brightness had an uptrend increase with augment of opaques thickness. Metal base color was opaqued and the basic hue was set. A lower and unstable value, besides a relative stable Y, was measured with the uncompleted opaquing. A stability of hue had been gradually concentrated within a certain range accompanying with the increase of opaquing ceramic thickness. A concentrated hue in the second thickness was found in CARAT ceramic which had high ability of opaque and had a stable hue of ceramic in comparison with other opaques. Among those changes, CARAT's brightness showed a minimal change; a gradual stability of chromatics was presented and was limited with-in a certain range though the augment of opaques.</p><p><b>CONCLUSION</b>The metal color in base could be completely opaqued while opaques thickness reaches a certain range. CARAT is the materials of minimal thickness and has relatively strong capacity for opaques.</p>