Which of the following is not always a true odontogenic infection
**Core Concept**
Odontogenic infections are a type of dental infection that originates from the teeth or surrounding tissues, such as the periodontal ligament, alveolar bone, or dental pulp. These infections can spread to adjacent structures, including the maxillary sinus, orbit, or intracranial cavity.
**Why the Correct Answer is Right**
Odontogenic infections can be categorized based on their origin and potential spread. True odontogenic infections typically arise from the teeth or surrounding dental structures and can progress to involve adjacent tissues and spaces. However, not all infections that involve the dental region are truly odontogenic. For instance, some infections may originate from non-dental sources, such as the mucous membranes of the oral cavity, and are therefore not considered odontogenic.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because odontogenic infections can indeed originate from the teeth or surrounding dental structures, making it a true odontogenic infection.
**Option B:** This option is incorrect because certain infections, such as those involving the periodontal ligament or dental pulp, are considered true odontogenic infections.
**Option C:** This option is incorrect because some infections, like those affecting the dental alveolus, are indeed true odontogenic infections due to their origin from dental structures.
**Clinical Pearl / High-Yield Fact**
It's essential to distinguish between odontogenic and non-odontogenic infections to guide appropriate treatment and prevent unnecessary surgical interventions.
**Correct Answer:** D