Answer :

Final answer:

The first commercial dental lab in the U.S was established in 1887. This development marked a major shift in the field of dentistry, allowing for more professional and efficient dental manufacturing.

Explanation:

The first commercial dental lab in the US was established during the year 1887. It was founded by Benjamin Franklin Arrington in Pennsylvania. This dental lab provided services such as creating custom dental prosthetics, dentures, and crowns. This was a significant milestone in the field of dentistry, as it marked a major shift towards professional dental manufacturing. Prior to this, much of the work was performed by the dentists themselves directly in their clinics. The establishment of commercial dental labs allowed for the manufacturing of dental prosthetics and other appliances to be carried out separately from the dental practice, enhancing the quality and efficiency of these works.

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