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In assessing the outcome of a flush terminal plane occlusion, research by Bishara indicates that it evolves into a more significant proportion of Class I and Class II relationships. Specifically, Bishara’s findings suggest that a flush terminal plane occlusion has been observed to result in 56% of patients developing a Class I occlusion and 44% transitioning to a Class II occlusion.

This balanced representation underlines the variability that can arise from a flush terminal plane in mixed dentition, whereby the dental and skeletal developmental factors can influence the final occlusal relationships as the permanent dentition erupts. Such understanding is critical for orthodontists when evaluating treatment options and anticipating potential treatment outcomes for patients with a flush terminal plane.

The proportions reflected in the other choices do not align with Bishara's findings and therefore do not accurately represent the expected occlusal outcomes associated with flush terminal plane occlusion.