Can dental implants cause speech problems?

Tooth extraction will always cause bone loss in the extraction site. When a tooth is removed, functional forces cannot be transmitted to the bone supporting that tooth. Bone loss occurs to conserve resources (to build and maintain bone at the same volume). This is a physiological (natural) phenomenon that keeps our bodies functioning efficiently. There are techniques to reduce (but not prevent) bone loss (bone grafting) at the time of extraction. Bone grafting using artificial bone does not produce the same volume of native (a continuation of the patient's own jawbone) bone.

It’s exactly the opposite. Dental implants are there to help you enunciate and speak better, so I do not see why having teeth will make you worse at speaking. In fact, dental implants are great replacements for teeth. So it should only help you speak better.