The correct response is b says that missing tooth identifies when cylinder #1 is at TDC and that the missing tooth is normal.
Numerous oral health issues, including infection, decay, and even further tooth loss, are frequently brought on by tooth loss. The fundamental structure of the bone may have been harmed, which might cause the remaining teeth to shift and become unstable. Bone does not regenerate. Even one missing tooth can have serious, long-lasting effects on the rest of your mouth. The neighbouring teeth are also impacted when you lose a rear molar since they no longer have the same structure and support. You regrettably notice a shift in your other back teeth as a result. The least expensive approach to restore teeth after an accident, cavities, or decay is with a dental implant. This technique for replacing teeth also has a lengthy lifespan. This is so because the tooth you had replaced is firmly planted.
Learn more about missing tooth here
https://brainly.com/question/29787717
#SPJ4