Which statement about disadvantages is correct?

Which statement about disadvantages is correct?

• A. Depends on patient compliance
• B. Difficult to obtain complex tooth movements
• C. Both of the above
• D. None of the above

Answer: (C)

Disadvantages of this approach include reliance on patient compliance and difficulty in obtaining complex tooth movements. In clear aligner therapy, success hinges on wearing the aligners for about 20–22 hours a day and following the prescribed schedule. If a patient doesn’t wear them as instructed, movement can stall, treatment can take longer, and results become less predictable. At the same time, while aligners handle many tooth movements, achieving precise root movement, torque control, significant intrusion or extrusion, and complex rotations can be more challenging than with fixed appliances. These issues often require attachments, careful sequencing, or adjuncts, adding complexity and potential limits in certain cases. Because both factors describe real drawbacks of the approach, the statement that covers both is the best choice.

Disadvantages of this approach include reliance on patient compliance and difficulty in obtaining complex tooth movements. In clear aligner therapy, success hinges on wearing the aligners for about 20–22 hours a day and following the prescribed schedule. If a patient doesn’t wear them as instructed, movement can stall, treatment can take longer, and results become less predictable. At the same time, while aligners handle many tooth movements, achieving precise root movement, torque control, significant intrusion or extrusion, and complex rotations can be more challenging than with fixed appliances. These issues often require attachments, careful sequencing, or adjuncts, adding complexity and potential limits in certain cases. Because both factors describe real drawbacks of the approach, the statement that covers both is the best choice.