INBDE (Integrated National Board Dental Examination) Practice Exam

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All major connectors should cross the midline at a:

curve
right angle
45-degree angle
straight line

The correct answer is: right angle

Major connectors refer to the major part of a dental appliance that connects all the components together. When designing a major connector, it is important to consider the distribution of forces on the appliance. A major connector should ideally cross the midline at a right angle to evenly distribute forces and prevent any unwanted movement or rotation of the appliance. Option A, a curve, may create uneven distribution of forces and lead to unwanted movement. Option C, a 45-degree angle, may also lead to uneven distribution and cause the appliance to tip. Option D, a straight line, may also cause unwanted movement as it does not provide enough stability at the midline. Therefore, option B, a right angle, is the most ideal and stable option for major connectors to cross the midline.