So this respected secular medical journal indicates that there is NO IUD which does not also, at least in part, prevent implantation AFTER conception. If you believe that life begins at conception (and I do) then this seems to indicate that ALL IUDs have a possibly abortion-causing component.
Here's the link.
Here's the abstract.
There are many potential mechanisms of action for the intrauterine device (IUD), which vary by type of IUD (inert, copper, or hormonal). This paper reviews the evidence for each potential mechanism of action. On the basis of available data for fertilization rates and clinical pregnancy rates, the relative contribution of mechanisms acting before or after fertilization were quantitatively estimated. These estimates indicate that, although prefertilization effects are more prominent for the copper IUD, both prefertilization and postfertilization mechanisms of action contribute significantly to the effectiveness of all types of intrauterine devices. (Am J Obstet Gynecol 2002;187:1699-708.)
One member was concerned that the article referenced was "old" (i.e. 12 years). Yet I have found nothing to soundly refute the finding yet.
So this year I'm digging again and here's what I'm finding very recently ...
Here is more information of IUD causing abortion.
From the website for The American Congress of Obstetricians and Gynecologists. in FAQ184, July 2014 (Note the very recent dating of this publication. The bold and red emphases are mine.)
How does the IUD work?
Both types of IUDs work mainly by preventing fertilization of the egg by the sperm. The hormonal IUD also thickens cervical mucus, which makes it harder for sperm to enter the uterus and fertilize the egg, and keeps the lining of the uterus thin, which makes it less likely that a fertilized egg will attach to it.
What is the birth control implant?
The birth control implant is a single flexible rod about the size of a matchstick that is inserted under the skin in the upper arm. It releases progestin into the body. It protects against pregnancy for up to 3 years.
How does the birth control implant work?
The progestin in the implant prevents pregnancy mainly by stopping ovulation. In addition, the progestin in the implant thickens cervical mucus, which makes it harder for sperm to enter the uterus and fertilize the egg. Progestin also keeps the lining of the uterus thin, making it less likely that a fertilized egg will attach to it.
And in September 2013 in FAQ 021 they publish here that...
How do birth control pills work?
Birth control pills contain hormones that prevent ovulation. These hormones also cause other changes in the body that help prevent pregnancy. The mucus in the cervix thickens, which makes it hard for sperm to enter the uterus. The lining of the uterus thins, making it less likely that a fertilized egg can attach to it.
I was informed about these last two documents by Abort73.com, at this website. Of course the 73 in their name remembers that awful day of January 22, 1973 in which the Supreme Court made the Roe v Wade decision legalizing abortion in all 50 states.