83 Maxillary implant overdentures: two implants in atrophic jaws Due to his impaired general health, the participant who lost two implants chose to be further treated with a conventional denture. The participant who lost one implant was reimplanted. After successful osseointegration a new IOD was fabricated. Table 5.1 | Implant and overdenture survival, radiographical and clinical parameters. T1 T12 Participants (n) 15 14 Implants survival (n (%)) 30 (100%) 25 (89.3%) Prostheses survival (n (%)) 15 (100%) 12 (85.7%) Mean marginal bone level change (SD) NA -0.5 mm (0.7) Mean probing depth change (SD) NA 0.0 mm (1.0) Median plaque-index [Q1-Q3] 0.5 [0-1] 0 [0-1] Median calculus-index [Q1-Q3] 0 [0-0] 0 [0-0] Median gingival-index [Q1-Q3] 0 [0-1] 0 [0-0] Median bleeding index [Q1-Q3] 0 [0-1] 0 [0-1] Q1-Q3= interquartile range; mm = millimetres; n = number of; NA = not applicable; SD = standard deviation. Marginal bone level change and clinical outcomes The remaining 12 participants completed the one year follow-up. Mean MBLC after 12 months of function was -0.5±0.7 mm. Mean PDC was 0.0±1.0 mm. Other clinical outcomes were low at T1 and remained low at T12 (Table 5.1). Masticatory performance and PROMs Data on masticatory performance (MAI) and PROMs are listed in Table 5.2. For MAI, the Shapiro-Wilk test did not result in a significant difference and the datasets followed a normal distribution in the Q-Q-plots, and therefore normality of data was assumed. At T0, the mean MAI was 22.1±2.5. At T12, the MAI significantly improved (18.7±2.4, p=0.002, Paired-samples t-test). For the PROMs the Shapiro-Wilk resulted in a significant difference, and therefore normality was not assumed. For the CAQ all items improved significantly between pre-treatment and T12, favouring IOD treatment. For the DCQ and the OHIP-NL49 most items improved significantly between pre-treatment and T12, favouring IOD treatment, with the exception of “facial aesthetics” and “neutral space” in the DCQ. Complications All implants were placed without any peri-operative complications. The wound healing was uneventful, although two patients suffered from severe haemorrhage without additional intraoral bleeding one day after implant placement. Both patients regularly used direct-acting oral anticoagulants. In one patient the nylon caps had to be replaced due to wear and in three patients one abutment were retightened. 5
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