Answer :
Final answer:
Agarose does not have a historical use in the specified categories of dentistry. Instead, it has been used primarily for tissue culture studies. Dental fillings commonly use amalgams, with dental pain relief and teeth whitening involving other substances.
Explanation:
The historical use of agarose in dentistry does not align with any of the provided options. Agarose, a type of sulphated galactose, forms a solidified medium as it gels upon cooling. This property has been primarily used in tissue culture studies rather than dentistry.
However, to address the options given, amalgams are commonly used as a dental filling material due to their cost-effectiveness, ease of use, and durability, despite concerns about mercury toxicity. Other uses like topical analgesia for dental pain or teeth whitening involve different substances, and orthodontic appliances typically incorporate metals rather than organic polymers.
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