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document
A 5-year randomized trial to compare 1 or 2 implants for implant overdentures . The hypothesis of this 5-y randomized clinical trial was that there would be no significant difference in the satisfaction of edentulous participants with removable complete overdentures attached to 1 or 2 mandibular implants . Secondary aims were to test changes in satisfaction between and within the groups from baseline to 5 y and differences between the groups in implant survival and prosthodontic maintenance over 5 y . Each of the 86 participants ( mean age , 67 y ) was randomly allocated to receive either 1 implant in the midline ( group 1 ) or 2 implants in the canine areas ( group 2 ) attached to a mandibular overdenture opposing a maxillary complete denture . Satisfaction was self-assessed by participants on a visual analog scale at baseline prior to implants , as well as at 2 mo and 1 , 3 , and 5 y with implant overdentures , whereas implant survival and prosthodontic maintenance were assessed by clinical examination . After 5 y , 29 participants in group 1 and 33 in group 2 were available , with most dropouts due to death . Satisfaction with the implant denture after 5 y was significantly ( P < 0.001 ) higher than at baseline in both groups and remained with no significant difference ( P = 0.32 ) between the groups . No implants failed in group 1 but 5 failed before loading in 4 participants in group 2 . Most participants required maintenance or occasionally denture replacement , and although differences between the groups were not statistically significant , group 1 experienced almost twice as many fractured dentures usually adjacent to the implant attachment . We conclude that there were no significant differences after 5 y in satisfaction or survival of implants with mandibular overdentures retained by 1 implant or 2 implants . Additional research is required to confirm long-term treatment effectiveness of single-implant dentures and the implications of prosthetic maintenance with implant overdentures ( ClinicalTrials.gov : NCT02117856 ) .
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Intervention_Physical
implants
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Intervention_Physical
mandibular implants
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Intervention_Physical
1 implant in the midline
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Intervention_Physical
2 implants in the canine areas
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Outcome_Mental
satisfaction
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Outcome_Mental
satisfaction
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Outcome_Mortality
implant survival
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Outcome_Mental
Satisfaction was self-assessed
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Outcome_Physical
visual analog scale
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Outcome_Mortality
implant survival and prosthodontic maintenance
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Outcome_Mortality
death .
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Outcome_Mental
Satisfaction
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Outcome_Other
failed
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Outcome_Other
maintenance
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Outcome_Physical
denture replacement
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Outcome_Physical
fractured dentures
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Outcome_Mortality
satisfaction or survival of implants
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Outcome_Other
effectiveness
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Participant_Condition
implant overdentures
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Participant_Sample-size
86
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Participant_Age
( mean age , 67 y )