111 Maxillary implant overdentures: retreatment after failure Mandibular state Failed maxillary prosthesis Previous no. of implants Brand failed implants Position failed implants Partially dentulous OD on bar 6 Pitt-easy 16, 14, 13, 23, 24, 26 OD on bar OD on ball 4 IMZ 14, 13, 23, 24 Partially dentulous FDP 5 Pitt-easy 16, 22, 25, 26, 27 Partially dentulous FDP 5 Astra 15, 13, 12, 22, 23 OD on bar OD on bar 8 Pitt-easy 16, 14, 13, 12, 21, 23, 24, 26 OD on bar OD on bar 5 Astra 16, 14, 12 ,21 ,23 Partially dentulous OD on ball 2 Nobel Biocare 13, 23 OD on bar OD on bar 6 Pitt-easy 16, 14, 13, 23, 24, 26 Partially dentulous OD on ball 3 MegaGen 15, 12, 25 Partially dentulous OD on ball 6 Pitt-easy 15, 14, 12, 22, 24, 25 Conventional denture OD on ball 6 Biomet 3i 16, 14, 12, 22, 24, 26 Partially dentulous FDP 6 MegaGen 15, 13, 11, 21, 23, 25 OD on bar OD on bar 4 Straumann 16, 13, 23, 25 Partially dentulous OD on ball 6 Straumann 16, 14, 12, 22, 24, 26 OD on bar OD on bar 6 Pitt-easy 16, 14, 12, 22, 24, 26 • Bleeding on probing, using the Mombelli et al. index 13 (score 0: no bleeding when using a periodontal probe; score 1: isolated bleeding spots visible; score 2: a confluent red line of blood along the mucosa margin; score 3: heavy or profuse bleeding). • Pocket depth (PD) was measured at four sites of each implant (mesial, vestibular, distal and oral) using a periodontal probe (Merrit-B; Hu-Friedy, Chicago, IL, USA), whereby the deepest pocket per implant was recorded. Patient related outcome measures For the assessment of PROMs, all the participants were asked to complete three questionnaires regarding chewing ability15, denture complaints16 and oral health quality of life (OHIP-NL4917). 7
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