Final answer:
In orthodontics, gomphosis is the joint that anchors the tooth in the jaw using the periodontal ligament, but this does not indicate the most common fixed appliance attachment.
Step-by-step explanation:
The most common type of attachment for fixed appliances, in the context of orthodontics, is not directly indicated in the provided information. In psychology, the most common type of attachment is secure attachment, where children show healthy bonds and interactions with their caregivers.
It is important to understand the biology of tooth attachment in the jaw, which is characterized by a specialized fibrous joint known as gomphosis. This joint securely anchors the root of a tooth into its bony socket within either the maxillary or mandible bone of the skull. The fibrous connection between the bony socket and the tooth is the periodontal ligament, which is an essential part of the attachment system that supports the teeth.
Meanwhile, when discussing behavioral patterns in infants and toddlers, the most common type of parent-child attachment identified by Ainsworth is secure attachment. In this form of attachment, children feel comfort from the presence of their caregivers and seek them out in times of stress, showing distress upon separation and relief or happiness upon reunion.