What is a mandible buttress?
What is a mandible buttress?
The vertical buttresses consist of the paired nasomaxillary (NM), zygomaticomaxillary (ZM) and pterygomaxillary (PM) midfacial buttresses as well as the ramus of the mandible. These buttresses define the vertical height of the face and provide the bony support required for mastication.
What is a buttress fracture?
Buttress plates are osteosynthetic implants commonly used in the metaphyseal area for internal fixation of articular fractures to support intraarticular fragments.
How many buttresses does lower jaw have?
Anatomy of the Facial Buttresses There are three paired vertical and three transverse buttresses (Figure 1).
What is the most commonly associated injury with a LeFort I fracture?
Le Fort fractures may be associated with other injuries such as dental or alveolar ridge fractures (alveolar and palatal fractures are commonly associated with all types of Le Fort fractures and make the repair more difficult and complex), cerebrospinal fluid leaks, and severe epistaxis.
What is the cranial buttress?
The buttress system absorbs and transmits forces applied to the facial skeleton. Masticatory forces are transmitted to the skull base primarily through the vertical buttresses, which are joined and additionally supported by the horizontal buttresses.
What is a buttress in anatomy?
buttress. (lip’ō-oks’ĭ-jen-ās), A structure placed against the base of another to support or stabilize it.
What does a buttress plate do?
Buttress plates are used to support bone that is unstable in compression or axial loading. These plates are often used in the distal radius and tibial plateau to hold impacted and depressed fragments in position once they have been elevated.
How many mandibular Buttresss are there?
The four horizontal buttresses are the upper transverse maxillary buttress, lower transverse maxillary buttress, upper transverse mandibular buttress, and lower transverse mandibular buttress [30]; the frontal bar could be included as a fifth buttress [31].
What are the buttresses of maxilla?
The paired medial maxillary buttresses are the columns of bone from the anterior nasal spine, extending along the rim of the piriform aperture, up the frontal process of the maxilla, and across the nasofrontal junction to the frontal bone.
Which type of fracture is most likely to cause trismus?
A posterior mandibular buttress fracture, especially when associated with a displaced fracture of the condylar process or dislocation of the temporomandibular joint, can cause malocclusion and trismus.
What kind of buttress is a Le Fort fracture?
Zygomaticomaxillary complex (ZMC) fractures: upper transverse maxillary and lateral maxillary buttresses. Le Fort fractures: All involve posterior maxillary. Le Fort 1 involves inferior portions of lateral and medial maxillary buttresses. Le Fort 2 involves inferior lateral maxillary, superior medial maxillary buttresses.
Where does the ZM buttress begin and end?
The ZM buttress begins in the region above the first molar and continues up the lateral maxilla through the zygomatic bone along the lateral orbital rim through the frontal process of the zygoma and then through the zygomatic process of the frontal bone.
What makes up the buttress of the maxilla?
A number of different bones serve to make up these buttresses. The NM buttress is comprised primarily of the maxilla with contributions from the nasal bones and nasal process of the frontal bone.