Final answer:
The DB Cusp of #30 refers to the distobuccal cusp of the lower right first molar, which occludes with the corresponding area on an upper molar for proper mastication and jaw alignment.
Step-by-step explanation:
The question 'DB Cusp of #30 occludes…?' refers to dental terminology, specifically concerning the occlusion or contact relationship between the upper and lower teeth. 'DB' stands for distobuccal, which is a part of a molar tooth. '#30' is a designation in the Universal Numbering System for teeth, which refers to the lower right first molar. In occlusion, the DB cusp of the lower right first molar (#30) is meant to occlude with the corresponding groove or fossa of an upper molar, which would typically be part of the upper left first molar (#14). This occlusal relationship is important for proper mastication and jaw alignment. It does not relate to obstructive disease, occipital lobe, ocean upwelling, oceanic zone, or Octamer box.