Guérins sign is present characterised by ecchymosis in the region of greater palatine vessels.Le Fort II and Le Fort III (common) – Gross edema of soft tissue over the middle third of the face, bilateral circumorbital ecchymosis, bilateral subconjunctival hemorrhage, epistaxis, CSF rhinorrhoea, dish face deformity, diplopia, enophthalmos, cracked pot sound.Le Fort II – Step deformity at infraorbital margin, mobile mid face, anesthesia or paresthesia of cheek. Le Fort III – Tenderness and separation at frontozygomatic suture, lengthening of face, depression of ocular levels (enophthalmos), hooding of eyes, and tilting of occlusal plane, an imaginary curved plane between the edges of the incisors and the tips of the posterior teeth. As a result, there is gagging on the side of injury. Diagnosis
Diagnosis is suspected by physical exam and history, in which, classically, the hard and soft palate of the midface are mobile with respect to the remainder of facial structures. This finding can be inconsistent due to the midfacial bleeding and swelling that typically accompany such injuries, and so confirmation is usually needed by radiograph or CT. Classification
There are three types of Le Fort fractures. As the classification increases, the anatomic level of the maxillary fracture ascends from inferior to superior with respect to the maxilla:

Le Fort I fracture (horizontal), otherwise known as a floating palate, may result from a force of injury directed low on the maxillary alveolar rim, or upper dental row, in a downward direction.
Aluminium chloride monomer belongs to the point group D3h in its monomeric form and D2h in its dimeric form. Hexahydrate
The hexahydrate consists of octahedral [Al(H2O)6]3+ cation centers and chloride anions (Cl−) as counterions. Hydrogen bonds link the cation and anions. The hydrated form of aluminium chloride has an octahedral molecular geometry, with the central aluminium ion surrounded by six water ligand molecules. Being coordinatively saturated, the hydrate is of little value as a catalyst in Friedel-Crafts alkylation and related reactions. Uses
Alkylation and acylation of arenes
AlCl3 is a common Lewis-acid catalyst for Friedel-Crafts reactions, both acylations and alkylations. Important products are detergents and ethylbenzene. These types of reactions are the major use for aluminium chloride, for example, in the preparation of anthraquinone (used in the dyestuffs industry) from benzene and phosgene. In the general Friedel-Crafts reaction, an acyl chloride or alkyl halide reacts with an aromatic system as shown:
The alkylation reaction is more widely used than the acylation reaction, although its practice is more technically demanding. For both reactions, the aluminium chloride, as well as other materials and the equipment, should be dry, although a trace of moisture is necessary for the reaction to proceed. Detailed procedures are available for alkylation and acylation of arenes. A general problem with the Friedel-Crafts reaction is that the aluminium chloride catalyst sometimes is required in full stoichiometric quantities, because it complexes strongly with the products. This complication sometimes generates a large amount of corrosive waste.