Why four implants is enough
Four is enough because of where they go, not because the arch does less.
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The two at the front go in upright, into the deeper, denser bone at the front of the jaw that tends to survive longest after teeth are lost. The two at the back are tilted forwards, so their length lies in that same solid bone rather than reaching back towards the sinus in the upper jaw or the nerve canal in the lower one.
Tilting also brings the back implants further along the arch, widening the footprint the bridge stands on. Four well-spread anchor points are steadier than four bunched at the front. That geometry is why so many people told they need a bone graft can have full mouth dental implants without one. Where a graft or a sinus lift is still needed, it is covered by the price rather than added to it.






