i am sorry i forgot what the question was so i am going to wirte it again
I am not really good at explaning but let me try
well if u look at the occlusion then mesiofacial cusp lines with mesiobuccal grove and mesiolingual cusp occludes in central fossa ,
now the Mesiolingual cusp and distobuccal cusp form the oblique ridge,now in the right working mov mandilble moved to right and max is stationary so the buccal cusp of the mandible will move toward the buccal and buccal of maxillary molar will move toward the midline and they will cross over the buccal cusp of mandible molar, so this means that they cross over the buccal side now the question is,Is it mesiobuccal or distobuccal
now keep the oblique ridge in mind , it is the distobuccal cusp which forms it and distobuccl cusp is in line with distobuccal grove,so when mandible moves toward the buccal maxilla is moved toward the midline the distobuccal cusp of the maxilla(which includes the oblique ridge) will cross over the distofacial grove of the mandilbular first molar.Wasnt that a piece of cake
well i think it would be distolinual which was my last answer if the question was about the supporting cusp of the maxillary molar. correct me if i am wrong
I hope gorur and treasure u can make some sense out of it
BOND