Can we trust dental deck???

[dentalcn]

Hi,

I don't know how you guys feel about dental deck? It is very disturbing because I found tons of mistakes and confusing...
e.g. In one card:
REMEMBER:
In a working side movement, the mesiobuccal cusp of the maxillary FIRST MOLAR passes through the LINGUAL GROOVE of the mandibular first molar.
In a working side movement, the mesiobuccal cusp of the maxillary SECOND MOLAR passes through the FACIAL GROOVE of the mandibular second molar.
why two statements are different? which one is correct?

Again,
Which surfaces have a TRAPEZODIAL outline?
1. Lingual and labial of posterior teeth
2. Lingual and facial of all teeth
3.Lingual and buccal of anterior teeth
4.proximal surfaces of anterior teeth
5.Proximal surfaces of all posterior teeth
The answer is Lingual and facial of all teeth???!!!
how about canines?

anybody has clue about these?

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