Methods of post-processing photofabricated articles created via additive fabrication
A technology of additive manufacturing and optical processing, applied in the field of post-processing of optically processed products created through additive manufacturing, which can solve the problems of lack of biocompatibility
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Embodiment 1-4
[0125] Four photofabricated articles in the shape of conventional dental appliances were formed via a stereolithography process. These articles are two radiation curable compositions namely The cured products of BioClear (Examples 1-2) and GP Plus (Examples 3-4) were treated according to the method described below. The temperature at which the alkaline wash step occurred for each sample is shown in Table 3 below. For Examples 1, 2, and 4, the sequence of treatments was as follows: (1) photofinishing / printing, (2) cleaning, (3) post curing, and finally (4) alkaline wash. However, for Example 3, the order was changed so that the alkaline wash step occurred before the post-cure step. All preparations were then each subjected to a cytotoxicity test according to ISO 10993-5 at an extraction time of 24 hours. In Table 4 the results of the cytotoxicity tests are depicted.
[0126] Light Processing Settings
[0127] The solid photofabricated articles of Examples 1 and 2 are Th...
Embodiment 5-30
[0160] Next, additional samples were fabricated from BioClear with the same part geometry and applying the same procedures of photofabrication, printing, cleaning and post-curing as described with respect to Examples 1-4 above. The procedure for the caustic wash (with optional ultrasonic cleaning operation) was consistently performed as described below, with the exception of caustic wash temperature, wash time and neutralizer concentration (for each of Examples 5-30 For one, the neutralizing agent itself was still sodium bicarbonate) was varied as indicated in Table 5 below. For each of Examples 5-30, the sequence of post-processing was: (1) photoprocessing; (2) cleaning; (3) post-curing; and (4) alkaline washing, optionally in an ultrasonic bath. Finally, each of the samples was subjected to biocompatibility testing following the same ISO 10993-5 procedure described above in relation to Examples 1-4 above. The results are depicted in Table 5 below.
[0161] Alkaline washing...
Embodiment 31-34
[0169] Next, four additional samples were fabricated from BioClear by applying the same procedure of photofabrication, printing, cleaning and post-curing as described with respect to Examples 1-4 above. The geometry of Example 31 was maintained the same as that of the orthotics of Examples 1-4. Meanwhile, Examples 32-34 were fabricated as spheres of varying sizes as specified in Table 6 below. The procedure for the caustic wash was similarly maintained with respect to Examples 5-30, with the exception of caustic wash temperature, wash time, and neutralizer concentration (for each of Examples 31-34, the neutralizer itself still sodium bicarbonate) is modified as follows:
[0170] 30 g / L NaHCO3 in IPA / H 2 Concentration in O solution (wherein the volume ratio of IPA and water is respectively 20:80);
[0171] The washing time of each sample is 5 minutes;
[0172] be washed at 37°C; and
[0173] • No ultrasonic cleaning process shall be applied.
[0174] Mass, volume, surface...
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