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Influence of intermediate abutment height and timing of placement on marginal bone loss in single implant-supported crowns: a 12-month follow-up randomized clinical trial
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Influence of intermediate abutment height and timing of placement on marginal bone loss in single implant-supported crowns: a 12-month follow-up randomized clinical trial
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Influence of intermediate abutment height and timing of placement on marginal bone loss in single implant-supported crowns: a 12-month follow-up randomized clinical trial
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Journal Article
Influence of intermediate abutment height and timing of placement on marginal bone loss in single implant-supported crowns: a 12-month follow-up randomized clinical trial
2025
Overview
Objectives
To determine the most effective combination of abutment height and timing of placement in reducing marginal bone loss (MBL).
Materials and methods
54 patients received at least one single screw-retained crown on an implant replacing a posterior tooth (60 implants). Implants were divided into six groups based on intermediate abutment height (1.5 mm, 2 mm, 3 mm) and timing of placement (immediate: surgery 1; delayed: surgery 2): Group
A3I
(height 3, surgery 1), Group
A2I
(height 2, surgery 1), Group
A15I
(height 1.5, surgery 1), Group
A3D
(height 3, surgery 2), Group
A2D
(height 2, surgery 2), Group
A15D
(height 1.5, surgery 2). Mesial and distal linear radiographic measurements were taken at five follow-up points: implant surgery, crown placement (T1), and 3 (T2), 6 (T3), and 12 months after loading (T4). Partial and total MBL were compared between groups.
Results
After 12 months, the lowest MBL was found in groups
A3I
(0.13 ± 0.11 mm) and
A2I
(0.24 ± 0.11 mm), with no statistical difference between them. Groups
A15I
(0.70 ± 0.12 mm),
A3D
(0.66 ± 0.11 mm),
A2D
(0.62 ± 0.12 mm), and
A15D
(0.78 ± 0.11 mm) showed significantly higher MBL than groups 1 and 2, with no statistical difference among them.
Conclusions
Immediate abutments of 2–3 mm resulted in lower MBL compared to 1.5 mm immediate abutments or any delayed abutments.
Clinical Relevance
This study provides data on the optimal combination of intermediate abutment height and placement timing in preventing MBL.
Clinical Trial Registration
Clinical trial registration number: NCT06667531. link:
https://clinicaltrials.gov/study/NCT06667531
.
Publisher
Springer Berlin Heidelberg,Springer Nature B.V
