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Mandibular two‐implant overdentures with CAD‐CAM milled bars with distal extensions or retentive anchors: A randomized controlled trial


Srinivasan, Murali; Schimmel, Martin; Buser, Ramona; Maniewicz, Sabrina; Herrmann, François R; Müller, Frauke (2020). Mandibular two‐implant overdentures with CAD‐CAM milled bars with distal extensions or retentive anchors: A randomized controlled trial. Clinical Oral Implants Research, 31(12):1207-1222.

Abstract

Objective

This randomized controlled trial (RCT) aimed to demonstrate the non‐inferiority of mandibular 2‐implant overdentures (IODs) on a CAD‐CAM milled bar with long distal extensions (MBDE) against IODs on retentive anchors (RA).
Methods

Forty edentulous participants rehabilitated with a maxillary conventional denture and a mandibular 2‐IOD participated in this trial. They were randomized into two groups [Control group (CG): RA + gold matrices; Experimental group (EG): MBDE + gold clip]. The outcomes included implant survival rate (ISR), chewing efficiency [quantitative (VoH) and subjective (SA) assessments], peri‐implant marginal bone levels (PI‐MBL), maximum bite force (MBF), and patient‐reported outcomes [oral health impact profile (OHIP‐EDENT), and denture satisfaction index (DSI)]. Outcomes were recorded at baseline (BL), two weeks (T0), 6 months (T1), and at 1 year (T2) after the intervention. Intra‐ and inter‐group analyses were performed using regression models with ⍺=0.05.
Results

38 participants completed the T2 visit (CG: n = 19, age = 74.7 ± 7.8 years; EG: n = 19, age = 70.3 ± 10.7 years). At T2, there was no implant loss in either of the groups (ISR = 100%). There were no significant differences between the groups for the PI‐MBL changes (p = .754).

Improvements occurred faster in the EG than in the CG, but over the observation time, there were no differences between the trial groups for VoH, MBF, OHIP‐EDENT, and the DSI, except for SA being significantly better in the EG group (p = .022).
Conclusions

The results of this RCT confirm that mandibular 2‐IODs with a CAD‐CAM milled bar with long distal extensions are not an inferior treatment to the conventional IODs on retentive anchors in the short term (1 year).

Abstract

Objective

This randomized controlled trial (RCT) aimed to demonstrate the non‐inferiority of mandibular 2‐implant overdentures (IODs) on a CAD‐CAM milled bar with long distal extensions (MBDE) against IODs on retentive anchors (RA).
Methods

Forty edentulous participants rehabilitated with a maxillary conventional denture and a mandibular 2‐IOD participated in this trial. They were randomized into two groups [Control group (CG): RA + gold matrices; Experimental group (EG): MBDE + gold clip]. The outcomes included implant survival rate (ISR), chewing efficiency [quantitative (VoH) and subjective (SA) assessments], peri‐implant marginal bone levels (PI‐MBL), maximum bite force (MBF), and patient‐reported outcomes [oral health impact profile (OHIP‐EDENT), and denture satisfaction index (DSI)]. Outcomes were recorded at baseline (BL), two weeks (T0), 6 months (T1), and at 1 year (T2) after the intervention. Intra‐ and inter‐group analyses were performed using regression models with ⍺=0.05.
Results

38 participants completed the T2 visit (CG: n = 19, age = 74.7 ± 7.8 years; EG: n = 19, age = 70.3 ± 10.7 years). At T2, there was no implant loss in either of the groups (ISR = 100%). There were no significant differences between the groups for the PI‐MBL changes (p = .754).

Improvements occurred faster in the EG than in the CG, but over the observation time, there were no differences between the trial groups for VoH, MBF, OHIP‐EDENT, and the DSI, except for SA being significantly better in the EG group (p = .022).
Conclusions

The results of this RCT confirm that mandibular 2‐IODs with a CAD‐CAM milled bar with long distal extensions are not an inferior treatment to the conventional IODs on retentive anchors in the short term (1 year).

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Klinik für Allgemein-, Behinderten- und Seniorenzahnmedizin
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Health Sciences > Oral Surgery
Uncontrolled Keywords:Oral Surgery
Language:English
Date:1 December 2020
Deposited On:15 Jan 2021 07:23
Last Modified:16 Jan 2021 21:00
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0905-7161
OA Status:Closed
Publisher DOI:https://doi.org/10.1111/clr.13668
PubMed ID:32965052

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