A(n) is a stainless steel ring cemented to molars to hold the arch wire for orthodontics.

Band

Explanation:

An orthodontist is a dentist that deals with and diagnoses overbites as well as  occlusions, also deals with the  prevention and correction of misaligned or malpositioned teeth and jaws.

An orthodontic band is a stainless steel ring cemented to the molars to hold the arch wire for orthodontist. This band wraps completely round the tooth. The use is to offer a durable and rigid linkage for major corrections of misaligned tooth. They are usually anchored  for attachments to the tooth or attach an arch wire to the molars.

This band allows for smooth treatment to progress at faster rate and straighten teeth more constructively.

the right side of the picture going down is:

polymerase

protein

transport vesicle

modified protein

the left side of the picture going down is:

dna helix

single-stranded rna

endoplasmic reticulum

ribosome

golgi apparatus

protein released from vesicle

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atp is used for energy.