Which of the following best describes 'continuous' force in orthodontics?

In orthodontics, 'continuous' force refers to a steady and consistent force over time that is applied to teeth during treatment. This type of force is crucial for effective tooth movement and aligns with the principle of maintaining an ongoing influence on the dental structures to promote gradual adjustment. The consistent nature of continuous force allows for predictable biological responses in the periodontal ligament and surrounding alveolar bone, leading to effective tooth repositioning over the course of orthodontic therapy.

The other options highlight different types of forces that do not align with the concept of continuous force. A force applied for a specific duration would describe a time-limited force rather than a sustained one. A variable force suggests fluctuations in strength, which contrasts with the uniform application required for continuous force. Finally, a force that only acts temporarily denotes an intermittent influence rather than the sustained effect desired in orthodontic applications. Thus, the understanding of continuous force is vital for effective planning and executing orthodontic treatment.