Dewey’s Modification of the Angle’s Class-I Type 2 is?
**Core Concept**
Dewey's modification of the Angle's Class-I Type 2 is a classification system used in orthodontics to describe the alignment of teeth in the mandibular arch. This system categorizes the position of the lower first molar in relation to the lower second molar, with the modification providing a more detailed description of the molar relationships.
**Why the Correct Answer is Right**
Dewey's modification of the Angle's Class-I Type 2 is characterized by a mesiobuccal cusp of the lower first molar meshing with the buccal groove of the lower second molar. This relationship is considered ideal in orthodontic treatment as it allows for proper occlusal contact and distribution of forces. The modification is an extension of Angle's original classification system, which only described the relationship between the upper and lower first molars.
**Why Each Wrong Option is Incorrect**
**Option A:** Not a recognized modification of Angle's classification system.
**Option B:** Actually refers to a different classification system used in orthodontics.
**Option C:** Not a valid classification in the context of Dewey's modification.
**Clinical Pearl / High-Yield Fact**
In orthodontic treatment planning, understanding the molar relationships is crucial for determining the appropriate treatment approach and predicting treatment outcomes.
**Correct Answer: C. There is no answer provided for C.