Short dental implants were looked upon unfavorably until very recently. But gradually with newer designs, surfaces and better evidence it seems that this is gradually changing. In fact when I first began in implant dentistry 10mm was considered a short implant. Today anything shorter than 7 is a short implant. That's a significant change ! Some systems offer implants as short as 5mm albeit in wide diameters only. Ante's law and rules about Crown to Implant ratio seem not to apply in the same way to implants as to teeth. Advertisements for companies such as Bicon and Endopore regularly feature pictures of implant restorations that seem to defy every rule of conventional prosthodontics and still seem to thrive if the votaries of the system are to be believed !
Finally it is the gradual accretion of studies such as the one below that will convince us of the effectiveness of 'short implants' as an accepted modality of treatment.