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    Dimensional stability of additively manufactured dentate maxillary diagnostic casts in biobased model resin
    (MDPI, 2024) Demirel, Münir; Türksayar, Almira Ada Diken; Petersmann, Sandra; Spintzyk, Sebastian; Dönmez, Mustafa Borga
    This study aimed to evaluate the dimensional stability of maxillary diagnostic casts fabricated from a biobased model resin, which consists of 50% renewable raw materials for sustainable production, a model resin, and stone, over one month. A master maxillary stone cast was digitized with a laboratory scanner to generate a reference file. This master cast was also scanned with an intraoral scanner to additively manufacture casts with a biobased model resin (BAM) and a model resin (AM). Polyvinylsiloxane impressions of the master cast were also made and poured in type III stone (CV) (n = 8). The same laboratory scanner was used to digitize each model one day (T0), 1 week (T1), 2 weeks (T2), 3 weeks (T3), and 4 weeks (T4) after fabrication. Deviations from the reference file were calculated with an analysis software and analyzed with generalized linear model analysis (alpha = 0.05). The interaction between the material and the time point affected measured deviations (p < 0.001). Regardless of the time point, CV had the lowest and AM had the highest deviations (p < 0.001). BAM mostly had lower deviations at T0 and mostly had higher deviations at T4 (p <= 0.011). AM had the highest deviations at T4 and then at T3, whereas it had the lowest deviations at T0 (p <= 0.002). The measured deviations of CV increased after each time point (p < 0.001). BAM casts had deviations within the previously reported clinically acceptable thresholds over one month and had acceptable dimensional stability. Therefore, tested biobased resin may be a viable alternative for the sustainable manufacturing of maxillary diagnostic casts that are to be used clinically.
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    Positional accuracy of a single implant analog in additively manufactured casts in biobased model resin
    (Elsevier, 2024) Diken Türksayar, Almira Ada; Demirel, Münir; Petersmann, Sandra; Spintzyk, Sebastian; Dönmez, Mustafa Borga
    Objectives: To evaluate the positional accuracy of implant analogs in biobased model resin by comparing them to that of implant analogs in model resin casts and conventional analogs in dental stone casts. Methods: Polyvinylsiloxane impressions of a partially edentulous mandibular model with a single implant were made and poured in type IV dental stone. The same model was also digitized with an intraoral scanner and additively manufactured implant casts were fabricated in biobased model resin (FotoDent biobased model) and model resin (FotoDent model 2 beige -opaque) ( n = 8). All casts and the model were digitized with a laboratory scanner, and the scan files were imported into a 3 -dimensional analysis software (Geomagic Control X). The linear deviations of 2 standardized points on the scan body used during digitization were automatically calculated on x-, y-, and z-axes. Average deviations were used to define precision, and 1 -way analysis of variance and Tukey HSD tests were used for statistical analyses ( alpha = 0.05). Results: Biobased model resin led to higher deviations than dental stone (all axes, P <= 0.031) and model resin (yaxis, P = 0.015). Biobased model resin resulted in the lowest precision of implant analog position ( P <= 0.049). The difference in the positional accuracy of implant analogs of model resin and stone casts was nonsignificant ( P >= 0.196). Conclusions: Implant analogs in biobased model resin casts mostly had lower positional accuracy, whereas those in model resin and stone casts had similar positional accuracy. Regardless of the material, analogs deviated more towards mesial, while buccal deviations in additively manufactured casts and lingual deviations in stone casts were more prominent.