This review comparing the use of narrow-diameter and regular diameter dental implants for supporting mandibular overdentures included 8 studies reported in 12 publications. While the findings suggest no differences between narrow and regular implants supporting mandibular overdentures the findings should be viewed cautiously as the quality of evidence is limited in quality and quantity and also short-term in nature.
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This review of the effectiveness of different attachment systems for complete edentulous mandibular Implant-supported overdentures included 25 RCTs . The findings suggest no significant differences between attachment systems.
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This review of the clinical performance and self-reported patient outcomes of ball and stud attachments as mandibular overdenture retainers included 17 studies. While greater patient satisfaction was seen with the stud type almost all of the included studies were considered to be at high risk of bias so the findingas should be interpreted cautiously.
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This review of the outcomes of early and delayed loading of dental implants included 18 RCTs. The findings suggest that early and delayed loading protocols had similar clinical outcomes. However none of the included studies was at a low risk and 13 of the 18 studies were considered to be at high risk of bias. While the findings are similar to other reviews teh availabel evidence is of low to very low certainty.
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This review comparing patient-reported outcome measures (PROMs) and clinical outcomes associated with implant-supported overdentures and fixed prostheses in edentulous mandibles included 10 small studies. While the findings suggest better PROMS with fixed prosthesis the available evidence is limited in quality and quantity.
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This review of the the survival and complication rates of single implant retained mandibular overdentures included 17 studies (9 RCTs). While the findings suggest they are effective the available studies are small with only 3 providing follow-up of longer than two years.
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This review of the behaviour of overdentures supported by bar and clip or ball and O-ring attachments included 17 studies. The findings suggest no differences between the two sustems.
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6 RCTs were included in this Cochrane review of attachment systems for implant overdentures. The included studies provide insufficient evidence of relative effectiveness of prosthodontic success, prosthodontic maintenance, patient satisfaction, patient preference or costs.
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9 studies were included in this review of the effect of splinted or unsplinted overdenture attachment system on clinical outcomes. The findings suggest no difference however, the quality of the evidence is limited.
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This review comparing the impact of overdentures with conventional dentures on nutritional status included 8 studies finding no difference in relation to BMI, albumin or vitamin B12 6 months after treatment among the older population
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