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Changes of radiopacity around implants of different lengths: Five-year follow-up data of a randomized clinical trial


Sluka, Benjamin; Naenni, Nadja; Jung, Ronald E; Attin, Thomas; Schmidlin, Patrick R; Sahrmann, Philipp (2020). Changes of radiopacity around implants of different lengths: Five-year follow-up data of a randomized clinical trial. Clinical Oral Implants Research, 31(5):488-494.

Abstract

OBJECTIVE
To follow-up the radiographic changes in peri-implant bone of short (6 mm, test group) and long (10 mm, control group) single-unit implants five years after loading.
MATERIALS AND METHODS
Forty-three implants of the test and 44 implants of the control group could be reassessed from 96 originally included implants. Standardized areas of interest (AOI) were defined in the peri-implant bone at pre-defined locations at mid-length on both sides of the implants, and at the apex. An arbitrary mean grey scale value (GSV) was calculated for the AOI after brightness calibration of the radiographs. Changes for GSV were calculated and tested for possible inter- and intra-group differences using the Mann-Whitney and Wilcoxon tests.
RESULTS
The calculated intra-group differences between baseline and 5 years in the test group accounted for 2.4 ± 19.6 (i.e. slight brightening) and -6.2 ± 20.2 for the control group (i.e. slight shading), which resulted in a statistically significant difference in GSV change (p < .05). Crown-to-implant ratio was the only parameter showing an effect on GSV change (p = .001).
CONCLUSIONS
Assessing conventional radiographs, longer implants showed a slightly stronger change of radiopacity of the peri-implant bone (slight loss of density) than short ones (slightly enhanced density) after five years of loading.

Abstract

OBJECTIVE
To follow-up the radiographic changes in peri-implant bone of short (6 mm, test group) and long (10 mm, control group) single-unit implants five years after loading.
MATERIALS AND METHODS
Forty-three implants of the test and 44 implants of the control group could be reassessed from 96 originally included implants. Standardized areas of interest (AOI) were defined in the peri-implant bone at pre-defined locations at mid-length on both sides of the implants, and at the apex. An arbitrary mean grey scale value (GSV) was calculated for the AOI after brightness calibration of the radiographs. Changes for GSV were calculated and tested for possible inter- and intra-group differences using the Mann-Whitney and Wilcoxon tests.
RESULTS
The calculated intra-group differences between baseline and 5 years in the test group accounted for 2.4 ± 19.6 (i.e. slight brightening) and -6.2 ± 20.2 for the control group (i.e. slight shading), which resulted in a statistically significant difference in GSV change (p < .05). Crown-to-implant ratio was the only parameter showing an effect on GSV change (p = .001).
CONCLUSIONS
Assessing conventional radiographs, longer implants showed a slightly stronger change of radiopacity of the peri-implant bone (slight loss of density) than short ones (slightly enhanced density) after five years of loading.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic of Conservative and Preventive Dentistry
04 Faculty of Medicine > Center for Dental Medicine > Clinic of Reconstructive Dentistry
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Health Sciences > Oral Surgery
Language:English
Date:May 2020
Deposited On:07 Jan 2021 07:46
Last Modified:24 May 2024 01:45
Publisher:Wiley-Blackwell Publishing, Inc.
ISSN:0905-7161
Additional Information:This is the peer reviewed version of the following article: Sluka, Benjamin; Naenni, Nadja; Jung, Ronald E; Attin, Thomas; Schmidlin, Patrick R; Sahrmann, Philipp (2020). Changes of radiopacity around implants of different lengths: Five-year follow-up data of a randomized clinical trial. Clinical Oral Implants Research, 31(5):488-494., which has been published in final form at https://doi.org/ 10.1111/clr.13584. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. (http://www.wileyauthors.com/self-archiving)
OA Status:Green
Publisher DOI:https://doi.org/10.1111/clr.13584
PubMed ID:32003872
  • Content: Accepted Version
  • Language: English