I don't know what you're referring to when you say "regular silver". If you're referring to preponderately colloidal silver as opposed to ionic - then saying it has no antibiotic properties is absurd.
Before antibiotics appeared, colloidal silver was used extensively in hospitals around the world. And particle sizes back then were MUCH larger than they're able to manufacture today.
The fact that ionic silver changes chemistry once it hits the digestive tract is stated wherever I've seen research on ionic silver (though the vast majority of studies are on colloidal). That it loses it's effect within seconds ANYWHERE inside the body I've heard by multiple sources too - though that does seem harder to prove.
No I don't have a bibliography of everywhere I've researched this information and have no intention of backtracking for the purposes of making one. Believe whatever you find compelling.