title: Soda-lime glass as a binder in reusable experimental investment for dental castings.
abstract: In this study, different glasses were investigated to improve reusable investments. Borosilicate glass (BSG) powder and soda-lime glass (SLG) powder were prepared by milling broken beakers and microscope slides, respectively, and used in experimental investments (I-BSG, I-SLG) by blending glass powder (10 wt%) with cristobalite (90 wt%). Some properties and casting fits were evaluated with commercial gypsum-bonded investment as the control. Both BSG and SLG were mainly composed of Si, but SLG had a large Ca content. The glass transition temperatures were approximately 800°C (BSG) and 700°C (SLG). Experimental investments with heating showed the significantly (p<0.05) higher expansion than that of the control. The compressive strength of I-SLG was higher than that of I-BSG, and increased with temperature. The MOD inlay obtained from I-SLG had a significantly smaller gap than that from I-BSG, and was comparable to the control. These results suggest SLG could be applied clinically as a reusable dental investment.
authors.affiliation: Department of Oral Biomaterials & Technology, Showa University School of Dentistry, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yagi
authors.forename: Zutai
authors.initials: Z
authors.lastname: Zhang
authors.forename: Yoshiteru
authors.initials: Y
authors.lastname: Aida
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Hotta
authors.forename: Yukimichi
authors.initials: Y
authors.lastname: Tamaki
authors.forename: Takashi
authors.initials: T
authors.lastname: Miyazaki
mesh_terms: D001896:Boron Compounds / Q000737:chemistry; D002118:Calcium / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D002133:Calcium Sulfate / Q000737:chemistry; D019245:Compressive Strength; D003734:Dental Casting Investment / Q000737:chemistry*; D003735:Dental Casting Technique; D018772:Dental Marginal Adaptation; D004055:Differential Thermal Analysis; D017743:Equipment Reuse; D005898:Glass / Q000737:chemistry*; D006047:Gold Alloys / Q000737:chemistry; D006358:Hot Temperature; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D017640:Silicates / Q000737:chemistry; D012825:Silicon / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D012834:Silver / Q000737:chemistry; D012972:Sodium Hydroxide / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013314:Stress, Mechanical; D013499:Surface Properties; D044366:Transition Temperature
chemical_list: D001896:Boron Compounds; D017610:Calcium Compounds; D003734:Dental Casting Investment; D006047:Gold Alloys; D010087:Oxides; D017640:Silicates; D012834:Silver; C004569:soda lime; D012972:Sodium Hydroxide; D010165:Palladium; D012822:Silicon Dioxide; D002118:Calcium; D002133:Calcium Sulfate; D012825:Silicon