Q: Class III malocclusion is called?
When evaluating occlusion, Angle’s classification is often used. This classification is based on the relationship of the mesiobuccal cusp of the maxillary first molar and the buccal groove of the mandibular first molar. See the blue arrows? Those are the two landmarks you should pay attention to. If the bite is not “perfect,” there are 3 possibilities:
- Class I (neutroclusion): MB cusp of the maxillary 1st molar fits in the buccal groove of the mandibular 1st Crowding and/or crossbite present.
- Class II (distoclusion): MB cusp of the maxillary 1st molar is in front of the buccal groove of the mandibular 1st
- Division I: upper incisors are protruded (out).
- Division II: upper incisors are retruded (in).
- Class III (mesioclusion): MB cusp of the maxillary 1st molar is behind the buccal groove of the mandibular 1st
Answer: (A). Mesioclusion
Learn more for the dental hygiene boards
Note that Class III malocclusion is also called underbite. When you study with StudentRDH, you will see that we included many more of similar practice questions in the mock exams (find them under National Boards Dental Hygiene Course, mock exam at the bottom). Why? Because this concept is extremely important for the NBDHE, NDHCE, and CSCE written exams. You should be able to recall this information as fast as you can recite your home address. Am I exaggerating? Maybe a little, but this is important!
Once you become a superstar dental hygienist, this will consist the basic of the basics in dentistry. Within the chapter of Dental Hygiene Process of care, see the small topic of dentition assessment. Make sure to understand the other occlusion types: overbite, underbite, etc. (You will have to sign up for the FULL PACKAGE to study. If you are interested, I promise that the self-guided course will NOT disappoint. See our Facebook review, from real students. As a spoiler, Amber said “I bought so many board review courses and websites. This one is by far the best.”)
I hope your day is productive! Never give up, chase your goals!
Related blog on the topic of Dental Anatomy: Screwdriver shaped incisor
(Disclaimer: StudentRDH is NOT affiliated with the NBDHE, NDHCE, CSCE, CDCA, WREB.)