From which anatomical structure should the first impression begin?

From which anatomical structure should the first impression begin?

• A. Upper jaw
• B. Hard palate
• C. Lower jaw
• D. Right half of the dental arch

Answer: (C)

Beginning the impression with the mandible gives you a stable, easily accessible base to work from and provides a reliable reference for subsequent recording of the upper arch. The lower arch tends to be simpler in terms of tissue geometry and becomes the anchor for establishing the general contour and vertical relationship with minimal risk of distortion from the soft palate or gag reflex. Once the mandibular impression is captured, the maxillary impression can be seated against a more defined, stable foundation, helping to reproduce proper occlusion and border form with less chance of movement or distortion. Starting with the upper arch would involve capturing the palate and posterior regions first, which are more variable in anatomy and more prone to movement and gagging, making accurate recording more difficult. The hard palate itself isn’t typically the initial reference point for an overall impression, and beginning on a random half of the arch doesn’t provide a consistent footing for later stages.

Beginning the impression with the mandible gives you a stable, easily accessible base to work from and provides a reliable reference for subsequent recording of the upper arch. The lower arch tends to be simpler in terms of tissue geometry and becomes the anchor for establishing the general contour and vertical relationship with minimal risk of distortion from the soft palate or gag reflex. Once the mandibular impression is captured, the maxillary impression can be seated against a more defined, stable foundation, helping to reproduce proper occlusion and border form with less chance of movement or distortion.

Starting with the upper arch would involve capturing the palate and posterior regions first, which are more variable in anatomy and more prone to movement and gagging, making accurate recording more difficult. The hard palate itself isn’t typically the initial reference point for an overall impression, and beginning on a random half of the arch doesn’t provide a consistent footing for later stages.