<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>dezork</author><text>I used Keystone PROFORM .030&amp;quot; Retainer Material. Keystone is a dental supplier, so I trust the plastic is biologically inert.</text><parent_chain><item><author>rl3</author><text>Not to be a downer, but was any thought given to the safety of the plastic(s) used?&lt;p&gt;This is something that&amp;#x27;s in your mouth a lot and constantly exposed to saliva.&lt;p&gt;The &lt;i&gt;Dimension 1200es&lt;/i&gt; mentioned doesn&amp;#x27;t appear to be specific to medical applications.[0] The product page lists the only compatible thermoplastic being &lt;i&gt;ABSplus-P430&lt;/i&gt;. The MSDS for that basically says the stuff is dangerous in molten form, and beyond that there&amp;#x27;s very little data.[1] The same company makes &amp;quot;Dental and Bio-Compatible&amp;quot; materials for use with their other products, and these appear to have considerably more safety data.[2]&lt;p&gt;&amp;gt;&lt;i&gt;The aligner steps have been printed, in addition to a “riser” that I added in order to make sure the vacuum forming plastic (sourced from ebay) ...&lt;/i&gt;&lt;p&gt;As another commenter pointed out, the vacuum forming plastic is probably the primary concern because the 3D printer was just used to create the molds. The specific type of vacuum plastic isn&amp;#x27;t mentioned.&lt;p&gt;Regardless, very neat project.&lt;p&gt;[0] &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;3d-printers&amp;#x2F;design-series&amp;#x2F;dimension-1200es&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;3d-printers&amp;#x2F;design-series&amp;#x2F;dimension...&lt;/a&gt;&lt;p&gt;[1] &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;~&amp;#x2F;media&amp;#x2F;Main&amp;#x2F;Files&amp;#x2F;SDS&amp;#x2F;P430_ABS_M30_ABS_Model&amp;#x2F;SDS-EU-P430-US-English.pdf?la=en&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;~&amp;#x2F;media&amp;#x2F;Main&amp;#x2F;Files&amp;#x2F;SDS&amp;#x2F;P430_ABS_M30...&lt;/a&gt;&lt;p&gt;[2] &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;materials&amp;#x2F;material-safety-data-sheets&amp;#x2F;polyjet&amp;#x2F;dental-and-bio-compatible-materials&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;materials&amp;#x2F;material-safety-data-shee...&lt;/a&gt;</text></item></parent_chain></comment><story><title>I made my own clear plastic tooth aligners and they worked</title><url>http://amosdudley.com/weblog/Ortho</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>johnloeber</author><text>This is a great point to raise. OP, please make sure that both the plastic you used, and the chemicals released as saliva gradually breaks down the plastic, are not going to be harmful. You wouldn&amp;#x27;t want long-term exposure of your gums to harmful agents. But that&amp;#x27;s probably the only concern.&lt;p&gt;Regardless: great job. I&amp;#x27;m very impressed by this project -- I love seeing applications of 3d printing. Especially one like this turns an expensive (and slow!) medical procedure into something that can be done easily at home, or cheaply in the office of a trained professional.</text><parent_chain><item><author>rl3</author><text>Not to be a downer, but was any thought given to the safety of the plastic(s) used?&lt;p&gt;This is something that&amp;#x27;s in your mouth a lot and constantly exposed to saliva.&lt;p&gt;The &lt;i&gt;Dimension 1200es&lt;/i&gt; mentioned doesn&amp;#x27;t appear to be specific to medical applications.[0] The product page lists the only compatible thermoplastic being &lt;i&gt;ABSplus-P430&lt;/i&gt;. The MSDS for that basically says the stuff is dangerous in molten form, and beyond that there&amp;#x27;s very little data.[1] The same company makes &amp;quot;Dental and Bio-Compatible&amp;quot; materials for use with their other products, and these appear to have considerably more safety data.[2]&lt;p&gt;&amp;gt;&lt;i&gt;The aligner steps have been printed, in addition to a “riser” that I added in order to make sure the vacuum forming plastic (sourced from ebay) ...&lt;/i&gt;&lt;p&gt;As another commenter pointed out, the vacuum forming plastic is probably the primary concern because the 3D printer was just used to create the molds. The specific type of vacuum plastic isn&amp;#x27;t mentioned.&lt;p&gt;Regardless, very neat project.&lt;p&gt;[0] &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;3d-printers&amp;#x2F;design-series&amp;#x2F;dimension-1200es&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;3d-printers&amp;#x2F;design-series&amp;#x2F;dimension...&lt;/a&gt;&lt;p&gt;[1] &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;~&amp;#x2F;media&amp;#x2F;Main&amp;#x2F;Files&amp;#x2F;SDS&amp;#x2F;P430_ABS_M30_ABS_Model&amp;#x2F;SDS-EU-P430-US-English.pdf?la=en&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;~&amp;#x2F;media&amp;#x2F;Main&amp;#x2F;Files&amp;#x2F;SDS&amp;#x2F;P430_ABS_M30...&lt;/a&gt;&lt;p&gt;[2] &lt;a href=&quot;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;materials&amp;#x2F;material-safety-data-sheets&amp;#x2F;polyjet&amp;#x2F;dental-and-bio-compatible-materials&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;www.stratasys.com&amp;#x2F;materials&amp;#x2F;material-safety-data-shee...&lt;/a&gt;</text></item></parent_chain></comment><story><title>I made my own clear plastic tooth aligners and they worked</title><url>http://amosdudley.com/weblog/Ortho</url></story>