Platform switching versus regular platform implants: 3-year post-loading results from a randomised controlled trial.
Eur J Oral Implantol
; 9(4): 381-390, 2016.
Article
in En
| MEDLINE
| ID: mdl-27990506
ABSTRACT
PURPOSE:
To test the hypothesis that platform switching and regular platform implants would have different outcomes in single-tooth replacement against the alternative hypothesis of no difference. MATERIAL ANDMETHODS:
This study was designed as a randomised controlled split-mouth trial. Eighteen patients with bilaterally missing single premolars or molars to be restored with implant-supported single crowns, were consecutively enrolled. Implant sites were randomly assigned to be treated according to the platform switching concept (PS group), or with matching implant-abutment diameters (RP group). A total of 36 Nobel Replace Tapered Groovy implants were installed. All the implants were inserted in healed bone, with an insertion torque between 35 and 45 Ncm, according to a one-stage protocol. Both implant types were loaded with a screw-retained temporary crown 3 months after implant insertion. Definitive screw-retained single crowns were delivered 2 months later. Outcome measures were implant and prosthetic survival rates, biological and prosthetic complications, radiographic marginal bone level (MBL) changes, pocket probing depth (PPD) and bleeding on probing (BOP). Clinical data was collected at implant placement (baseline), and at 3, 9 and 36â months after loading.RESULTS:
No patients dropped out and no implant failed. No prosthetic complications were recorded. One patient experienced mucosal inflammation with positive BOP (RP group) after 3 months, three patients had bilateral peri-implant mucosal inflammation with positive BOP at 6, 24 and 30 months after loading, respectively. There were no statistically significant differences between groups for complications (3/18 versus 4/18; Pâ =â 1.0; Odds Ratioâ =â 1.333; 95%â CI 0.3467 to 5.1272). Nine months after loading, the mean MBL was 0.93â ±â 0.26â mm in the RP group and 0.84â ±â 0.23â mm in the PS group, with no statistically significant differences between groups (mean differenceâ =â 0.09â mm, 95%â CI -0.22 to 0.04, Pâ =â 0.18). Three years after loading, mean MBL was 1.09â ±â 0.31â mm in the RP group and 1.06â ±â 0.24â mm in the PS group, with no statistically significant differences between groups (mean differenceâ =â 0.02â mm, 95%â CI -0.06 to 0.10, Pâ =â 0.70). Marginal bone level changes between 3 years and baseline were 0.72â ±â 0.28â mm in the RP group and 0.71â ±â 0.27â mm in the PS group, with no statistically significant differences between the groups (mean differenceâ =â -0.00â mm, 95% CIâ -0.07 to 0.07, Pâ =â 0.89). Mean PPD was 2.70â ±â 0.52â mm in the RP group and 2.46â ±â 0.69â mm in the PS group at 36 months after loading, with no statistically significant differences between the groups (mean differenceâ =â 0.23â mm, 95%â CI -0.05 to 0.35, Pâ =â 0.43). Mean BOP was 0.83â ±â 0.96â mm in the RP group and 0.89â ±â 0.99â mm in the PS group at 36 months after loading, with no statistically significant differences between the groups (mean differenceâ =â 0.07â mm, 95%â CI -0.03 to 0.17, Pâ =â 0.77).Conclusions:
The clinical and radiographic outcomes of implants restored according to the platform-switching concept versus implants restored with the matching implant-abutment diameters are comparable, 3 years after loading. Conflict of interest statement This study was not supported by any company. All authors declare no conflict of interest.
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Collection:
01-internacional
Database:
MEDLINE
Main subject:
Dental Implantation
/
Dental Implant-Abutment Design
Type of study:
Clinical_trials
/
Guideline
Limits:
Adult
/
Aged
/
Female
/
Humans
/
Male
/
Middle aged
Language:
En
Journal:
Eur J Oral Implantol
Journal subject:
ODONTOLOGIA
Year:
2016
Document type:
Article