98 Chapter 6 In the anterior group, no participants were treated for peri-implantitis within the first 5 years. At T5, three participants (four implants) were diagnosed with peri-implantitis, resulting in a patient level peri-implantitis incidence of 6.5% after 5 years. Between T5 and T10, one participant lost three implants due to peri-implantitis. At T10, the participant’s three other implants were also diagnosed with peri-implantitis. One additional implant was diagnosed with peri-implantitis in a participant that was already affected at T5, resulting in a patient level incidence of 11.1% after 10 years. In the posterior group, two participants (three implants) were treated for peri-implantitis within the first 5 years. Six additional participants (ten implants) were diagnosed with peri-implantitis, resulting in a patient level incidence of 13.3% after 5 years. Between T5 and T10, three implants were treated non-surgically in one participant. Three implants were lost by one participant that had been diagnosed with peri-implantitis at T5. At T10, this participant’s remaining three implants were also diagnosed with peri-implantitis. Three additional implants in three participants also presented with peri-implantitis, resulting in a patient level incidence of 26.1% after 10 years. Table 6.4 | Peri-implantitis incidence and severity of affected implants at implant level, 5 and 10 years (T5 and T10) after maxillary overdenture placement. T5 T10 Anterior Posterior Anterior Posterior Incidence Severity Incidence Severity Incidence Severity Incidence Severity Not affected 98,2% - 95.7% - 92.7% - 86.6% - > -2.0 to -2.5 mm 0.9% 50.0% 2.0% 46.5% 3.4% 46.6% 8.5% 63.9% > -2.5 to -3.0 mm 0.9% 50.0% 2.0% 46.5% 0.0% - 1.3% 9.8% > -3.0 to -3.5 mm 0.0% - 0.3% 7.0% 0.0% - 0.9% 6.8% > -3.5 to -4.0 mm 0.0% - 0.0% - 1.1% 15.1% 0.4% 3.0% > -4.0 mm 0.0% - 0.0% - 1.1% 15.1% 0.9% 6.8% Lost 0.0% - 0.0% - 1.7% 23.2% 1.3% 9.8% Extent and severity The extent of peri-implant mucositis was comparable for both groups: 46.0±27.0% at T5 and 52.8±32.0% at T10 (Table 6.3), meaning the proportion of affected implants per affected participant remained fairly stable. The extent of peri-implantitis at T5 was 25.0±8.3% in the anterior group and 34.4±13.7% in the posterior group. At T10, the extent of peri-implantitis had increased in both groups to 47.9±37.5% and 42.4±29.6%, respectively (Table 6.3). At T5, all affected implants of the anterior group and 93% of the affected implants of the posterior group had a MBLC between -2 and -3 mm. At T10, the severity in the anterior group increased: 30.2% of all affected implants had lost more than 3 mm of marginal bone and 23.2% of all affected implants
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