The operation is undertaken through an incision made in the gum above the teeth in the upper jaw. There are no incisions made on the face. The upper jaw is then cut with a small saw to allow it to be broken in a controlled manner.It is then moved into its new position, which has been predetermined during surgical planning with the aid of models of your teeth. A small plastic wafer is attached to the teeth to allow the new position of the upper jaw to be determined, which is then fixed into place with small metal plates and screws. These are made of titanium which is a very inert metal and safe to be used in the body. The gum is stitched back into place with dissolvable stitches.
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NBDE Quiz # 66
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1. Question
During a LeFort I maxillary osteotomy, the tooth most likely to be injured by a low os¬teotomy line is the:
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The correct answer is B. The cuspids, or ca¬nine teeth, have the longest roots in both the maxilla and mandible. The average length of a cuspid tooth from the tip of the root to the tip of the crown is 27 mm. It is vital to know the length and position of the dental roots to avoid injuring the apices of the cuspid teeth during Le Fort I osteotomy and placement of internal fixation (interosseous miniplates or microplates and screws). The dentition may also be injured during stabilization of maxillary or mandibu¬lar fractures. The bicuspid, central and lateral incisor, and molar teeth all have roots that are shorter than the roots of the cuspid teeth; the average length of a molar tooth from the tip of the root to the tip of the crown, for exam¬ple, is 24 mm. Consequently, these teeth are much less likely to be injured during LeFort I osteotomy.71. The correct answer is B. The cuspids, or ca¬nine teeth, have the longest roots in both the maxilla and mandible. The average length of a cuspid tooth from the tip of the root to the tip of the crown is 27 mm. It is vital to know the length and position of the dental roots to avoid injuring the apices of the cuspid teeth during Le Fort I osteotomy and placement of internal fixation (interosseous miniplates or microplates and screws). The dentition may also be injured during stabilization of maxillary or mandibu¬lar fractures. The bicuspid, central and lateral incisor, and molar teeth all have roots that are shorter than the roots of the cuspid teeth; the average length of a molar tooth from the tip of the root to the tip of the crown, for exam¬ple, is 24 mm. Consequently, these teeth are much less likely to be injured during LeFort I osteotomy.
Incorrect
The correct answer is B. The cuspids, or ca¬nine teeth, have the longest roots in both the maxilla and mandible. The average length of a cuspid tooth from the tip of the root to the tip of the crown is 27 mm. It is vital to know the length and position of the dental roots to avoid injuring the apices of the cuspid teeth during Le Fort I osteotomy and placement of internal fixation (interosseous miniplates or microplates and screws). The dentition may also be injured during stabilization of maxillary or mandibu¬lar fractures. The bicuspid, central and lateral incisor, and molar teeth all have roots that are shorter than the roots of the cuspid teeth; the average length of a molar tooth from the tip of the root to the tip of the crown, for exam¬ple, is 24 mm. Consequently, these teeth are much less likely to be injured during LeFort I osteotomy.71. The correct answer is B. The cuspids, or ca¬nine teeth, have the longest roots in both the maxilla and mandible. The average length of a cuspid tooth from the tip of the root to the tip of the crown is 27 mm. It is vital to know the length and position of the dental roots to avoid injuring the apices of the cuspid teeth during Le Fort I osteotomy and placement of internal fixation (interosseous miniplates or microplates and screws). The dentition may also be injured during stabilization of maxillary or mandibu¬lar fractures. The bicuspid, central and lateral incisor, and molar teeth all have roots that are shorter than the roots of the cuspid teeth; the average length of a molar tooth from the tip of the root to the tip of the crown, for exam¬ple, is 24 mm. Consequently, these teeth are much less likely to be injured during LeFort I osteotomy.
