Toshiya Ishii, Toshiya
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A comparison of three dimensional change in maxillary complete dentures between conventional heat polymerizing and microwave polymerizing techniques Sadamori, Shinsuke; Ishii, Toshiya; Hamada, Taizo; Razak, Arifzan
Dental Journal (Majalah Kedokteran Gigi) Vol 40, No 1 (2007): (March 2007)
Publisher : Faculty of Dental Medicine, Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/j.djmkg.v40.i1.p6-10

Abstract

The purpose of this study was to measure and compare two different polymerizing processes, heat polymerizing (HP) and microwave polymerizing (MP), on the three dimensional changes in the fitting surface and artificial teeth of maxillary complete dentures. A threedimensional coordinate measurement system was used to record distortion of the specimens. The distortion of the fitting surface was measured from the reference plane on the fitting side from which a coordinate system was set, and the movement of the artificial teeth and the distortion of the polished surface was measured from the reference plane of the artificial tooth side, from which a coordinate system was set. It was clearly showed that various distortions of denture specimens after polymerization process can be measured with this three-coordinate measuring machine. The study showed that the overall distortion of the fitting surface in HP specimens was shown to be larger than in MP ones.
Three dimensional changes in maxillary complete dentures immersed in water for seven days after polymerization Sadamori, Shinsuke; Ishii, Toshiya; Hamada, Taizo; Razak, Arifzan
Dental Journal (Majalah Kedokteran Gigi) Vol 41, No 1 (2008): (March 2008)
Publisher : Faculty of Dental Medicine, Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/j.djmkg.v41.i1.p1-4

Abstract

The purpose of this study was to investigate the three dimensional changes in the fitting surface and artificial teeth of maxillary complete dentures which were fabricated using two different polymerizing processes: heat polymerization (HP) and microwave polymerization (MP), after immersion in water for seven days. The amount of distortion in the molar region of the alveolar ridge was significantly different between HP and MP. However, the overall distortion of the dentures polymerized using both methods was similar. The distortion due to immersion in water for seven days compensated for the polymerization distortion, but the amount of distortion was very slight.