What happens if the curve of the arch is punched too flat or too narrow?

When the curve of the arch is punched too flat or too narrow, it can lead to specific issues with the dental material being used. The arch's shape is critical, as it affects how dental materials conform to the dental anatomy.

If the arch is punched too flat or too narrow, bunching and stretching on the lingual side can occur. This means that the material will not fit as intended, leading to an excess of material that collects on the lingual surface, causing deformities. Additionally, there may be folding and stretching on the facial side as well, which similarly results from an improper fit due to the incorrect arch shape. These distortions can ultimately compromise the effectiveness of the dental procedure and may affect the overall comfort and fit for the patient.

Therefore, both the presence of bunching and stretching on the lingual as well as folding and stretching on the facial indicates that both complications arise from a miscalculation of the arch’s curvature, confirming that both A and C are correct consequences of this error.