TY - JOUR AU - Van Kampen, F; Cune, M; van der Bilt, A TI - Retention and postinsertion maintenance of bar-clip, ball and magnet attachments in mandibular implant overdenture treatment: an in vivo comparison after 3 months of function JO - Clin Oral Impl Res VL - 14 PY - 2003 DO - 10.1046/j.0905-7161.2003.00961.x L3 - PubMed-ID: 15015948 SP - 720 EP - 726 ER -