Approximately 28% of people do not have a middle superior alveolar nerve. In such cases, the anterior superior alveolar nerve innervates the maxillary premolars and the mesiobuccal root of the first maxillary molar.
Investigators at Jamia Millia Islamia Describe Research in Central Nervous System Depressants.(Clinical report)
Dec 21, 2011; "The purpose of this study was to evaluate and compare the anesthetic efficacy of posterior superior alveolar (PSA) nerve blocks,...