How should grooves for a molar seven-eighths crown be oriented?

When considering the orientation of grooves for a molar seven-eighths crown, understanding the functional and structural aspects is crucial. Grooves are essential for providing retention and resistance to dislodgement of the crown. Orienting the grooves parallel to each other allows for a consistent mating surface and helps maintain stability as well as uniformity during the cementation process.

Additionally, orienting grooves perpendicular to the buccoaxial wall enhances the overall retention of the crown because it provides an anchoring mechanism against lateral forces, which could otherwise cause the crown to dislodge.

The combination of these orientations allows for maximizing retention from multiple angles, thus improving the overall effectiveness of the crown. Therefore, saying that grooves can be both parallel to each other and perpendicular to the buccoaxial wall captures the comprehensive approach to crown design, making the conclusion that all of the provided options are applicable.