What is the middle superior alveolar?
The middle superior alveolar​ nerve, also known as the middle superior dental nerve, is the second branch of the infra-orbital nerve, from the maxillary division of the trigeminal nerve. It is the smallest of the superior alveolar nerves and contributes to the superior dental plexus.
What is an MSA injection?
The middle superior alveolar (MSA) injection will anesthetize the mesiobuccal aspect of the maxillary first molar, both premolars, PDL, buccal bone, and periosteum, along with the soft tissue lateral to this area13 (Figure 2).
What does the IAN block?
Background: Inferior alveolar nerve block (IANB) is a technique of dental anesthesia, used to produce anesthesia of the mandibular teeth, gingivae of the mandible and lower lip. The conventional IANB is the most commonly used the nerve block technique for achieving local anesthesia for mandibular surgical procedures.
What structures does the middle superior alveolar nerve block innervate?
Alveolar nerves (anterior, middle, and posterior superior alveolar nerves)—provides sensory innervation to all of the upper teeth in the maxilla, as well as the gingiva.
How common is the middle superior alveolar nerve?
Anatomical studies on dissection of cadavers have found the presence of the MSA nerve in the range of 30-72%, and when it is absent, its innervation is supplied from a plexus formed by the ASA and the posterior superior alveolar nerves.
Which nerve is blocked for upper tooth extraction?
Posterior Superior Alveolar Nerve Block. The PSA nerve block, otherwise known as the tuberosity block or the zygomatic block, is used to achieve anesthesia of the maxillary molar teeth up to the first molar, with the exception of its mesiobuccal root in some cases.
What does the MSA nerve supply?
The middle superior alveolar nerve is a nerve that drops from the infraorbital portion of the maxillary nerve to supply the sinus mucosa, the roots of the maxillary premolars, and the mesiobuccal root of the first maxillary molar.
Where do you inject Ian block?
The inferior alveolar nerve block, a common procedure in dentistry, involves the insertion of a needle near the mandibular foramen in order to deposit a solution of local anesthetic near to the nerve before it enters the foramen, a region where the inferior alveolar vein and artery are also present.
Where do you inject ASA?
Malamed states the ASA injection site is the mesiobuccal fold above the first premolar, as this is the landmark that provides the shortest path through the tissue to the IO foramen. Intraorally, this injection will look quite similar to the MSA, just one tooth forward.
How do you give an MSA injection?
Approach: While retracting the cheek, insert the needle into the aforementioned intersection point at a 45-degree angle, and advance 1-1.5 cm. Aspirate. Slowly inject 2-3 mL of local anesthetic and massage for 10-20 seconds.