Yes, no and maybe.
Crowns, if covered, may be considered under basic or major categories, while bridges, including cantilever bridges, are considered are major service. Major services are often covered at a 50% benefit level. Also, some plans may only cover diagnostic and preventive services. Annual maximums, deductibles, frequency limitations and other restrictions may also affect coverage.
As with many dental services when you have a dental plan, it is often best to predetermine treatment for an estimate of your out-of-pocket costs.