Submandibular Space Infection — ORE Part 1 MCQ

Correct answer: E — Submandibular space infection arising from mandibular molar teeth

Submandibular space infection from mandibular molars is the most common type requiring hospital admission. The mandibular third molars and first/second molars are the most frequent source teeth (20.8–47.1% of odontogenic infections). Because their apices are positioned apical to the mylohyoid muscle attachment, infection easily spreads into the submandibular space, which becomes involved in 57.1% of hospitalised cases. In contrast, maxillary tooth infections more commonly cause buccal space or canine space infections, which are often managed in outpatient settings. Submental space infections from lower incisors are rare. Submandibular space involvement is clinically significant because this deep fascial space can rapidly progress to multisystem infection, potentially compromising the airway and requiring urgent surgical drainage—reasons for hospital admission.

Reference: Jones JH, Van Winkelhoff AJ. Oral microbiology. In: Odontogenic Orofacial Space Infections. PubMed (2023). https://pubmed.ncbi.nlm.nih.gov/36943966/. Corroborated by epidemiological analysis: Sato FRL et al. Features of odontogenic infections in hospitalised and non-hospitalised settings. Int J Infect Dis. 2010. https://pubmed.ncbi.nlm.nih.gov/21045219/