A Basic Study on Surface Undulation in Stone Casts : Effects of Impression and Stone Materials and Temperature at Impression Hardening

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  • MASAKI Hiroyuki
    Dental Materials Research Division, Nihon University School of Dentistry

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  • 模型の表面うねりに関する基礎的研究 : 印象材と模型材との組合せおよび印象材硬化時温度が及ぼす影響

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The precision of entire surface of stone casts was evaluated in terms of surface undulation(waviness).Two hydrocolloid impression materials, three rubber impression materials and two stones were used.Impressions of an acrylic plate were taken with perforated ring trays, and hardened at 23 and 32℃.The surface undulation of casts obtained from each impression was measured by a surface texture and profile measuring instrument.The deformation of the cast surface was classified according to the shape of the obtained effective profile.The surface undulation in casts from rubber impressions was less than that in casts from hydrocolloid impressions when the impressions were hardened at 23℃.The effect of temperature at impression hardening was significant in all impression materials.Hardening of the impressions at 32℃ decreased the surface undulation in the casts from hydrocolloid impressins while it increased that in the casts from rubber impressions.

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