The basal part of the labium, equivalent to the maxillary cardines and possibly including a part of the sternum of the labial segment, is called the postmentum.
2.
The most preferred bonded retainer is the multi-strand stainless steel wire type as it is bonded to every tooth in the labial segment, using composite resin or acid-etch composite bonding.
3.
The " lab " gene was initially so named because it disrupted the labial appendage; however, the lab gene is not expressed in the labial segment, and the labial appendage phenotype is likely a result of the broad disorganization resulting from the failure of head involution.
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