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ORIGINAL RESEARCH
Year : 2014  |  Volume : 1  |  Issue : 3  |  Page : 118-122

Dimensional changes in plaster cast models due to the position of the impression tray during setting


1 Department of Orthodontics, Universityof São Paulo State UNESP, Rua Humáita, Araraquara, São Paulo, Brazil
2 Department of Orthodontics, Federal Universityof Santa Maria, UFSM, Rua Marechal Floriano Peixoto, Santa Maria, Rio Grande do Sul, Brazil
3 Department of Restorative Dentistry, Universityof São Paulo State UNESP, Rua Humáita, Araraquara; Department of Restorative Dentistry, Camilo Castelo Branco University UNICASTELO, Av. Hilário da Silva Passos, Descalvado, São Paulo, Brazil
4 Department of Post Graduate Program in Dentistry, CEUMA University, Sao Luis Maranhão, Brazil
5 Department of Post Graduate Program in Integrated Dental Sciences, University of Cuiabá, MatoGrosso, Cuiabá, Brazil
6 Department of Odontopediatrics, Universityof São Paulo State UNESP, Rua Humáita, Araraquara, São Paulo, Brazil

Correspondence Address:
Mateus Rodrigues Tonetto
Department of Post Graduate Program in Integrated Dental Sciences, University of Cuiabá, MatoGrosso, Cuiabá
Brazil
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2348-2915.146488

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Introduction: The objective of this study was to assess whether the positioning of the impression tray could cause distortion to plaster casts during gypsum setting time.Materials and Methods: Fifteen pairs of master models were cast with alginate impression material and immediately filled with gypsum. Impressions were allowed to set with the tray in the noninverted position (Group A) or in the inverted position (Group B). The plaster models were digitized using a laser scanner (3Shape R-700, 3Shape A/S, Copenhagen, Denmark). Measurements of tooth size and distance were obtained using O3d software (Widialabs, Brazil) measurement tools. Data were analyzed by paired t-test and linear regression with 5% significance.Results and Conclusion: Most of the measurements from both groups were similar, except forthe lower intermolar distance. It was not possible to corroborate the presence of distortions due to the position of the impression tray during gypsum setting time.


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