Mandibular Symphysis
Pronunciation: SIM-fih-sis
The midline fibrocartilaginous junction of the two halves of the mandible that fuses during early childhood, forming the bony chin prominence.
Full Definition
The mandibular symphysis is the midline fusion zone of the right and left hemimandibles. In humans, this synchondrosis typically fuses within the first year of life, after which it forms a continuous bony structure. In cephalometric analysis, the symphysis region is studied for its morphology and density, which influence treatment planning for tooth movement, alveolar bone grafting, and chin surgery (genioplasty). Editors must not confuse the mandibular symphysis with the pubic symphysis (an analogous joint elsewhere in the body) or with the mental protuberance, which is a surface landmark on the symphysis.
Usage
Usage note: Note the correct spelling 'symphysis', not 'symphasis'. Do not confuse with the pubic symphysis.
In Context
- "CBCT imaging revealed adequate bone volume in the mandibular symphysis to accommodate mini-implant placement." — Surgical planning report
- "The manuscript incorrectly referred to the 'mandibular symphasis'; the editor corrected it to 'mandibular symphysis'." — Copyediting note