The mandibular tray selection requirements are met by

The posterior edge covers the posterior molar pad.

Mandibular trays are a type of restorative oral material used to support the jawbone and teeth to help restore oral function and aesthetics to patients. Mandibular trays are usually custom fabricated by the dentist to fit the patient's mouth and needs, and can be used to restore individual teeth or the entire jaw.

Mandibular trays are fabricated by taking an oral impression and then creating a model of the tray from the impression. The trays are usually made of resin or metal materials that provide good durability and adaptability. During the fabrication process, the dentist also needs to consider the patient's bite and chewing force to ensure the comfort and functionality of the tray.

The use of mandibular trays can help patients with a variety of oral problems such as missing teeth, misaligned teeth, and worn teeth. Trays support the teeth so that they are less likely to loosen or fall out, and also adjust the position and bite of the teeth to improve oral function and aesthetics.

In addition to their restorative function, mandibular trays can also be used for oral health care and prevention. For example, patients can wear trays while sleeping to prevent tooth wear and improper bite. Additionally, trays can be used to protect teeth and oral soft tissues from external impact and injury.

In conclusion, mandibular trays are an important restorative oral material that can help patients restore oral function and aesthetics, as well as be used for oral health care and prevention. Patients should pay attention to maintaining oral hygiene when using trays, and regularly check and maintain trays to ensure their good use and longevity.