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Trial registered on ANZCTR

Registration number
Ethics application status
Date submitted
Date registered
Date last updated
Type of registration
Prospectively registered

Titles & IDs
Public title
The effect of a periodontal intervention on renal health in Aboriginal Australian adults with kidney disease
Scientific title
The effect of a periodontal intervention on renal health in Aboriginal Australian adults with kidney disease
Secondary ID [1] 285552 0
Universal Trial Number (UTN)
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Renal disease
293371 0
Periodontal disease 293408 0
Condition category
Condition code
Renal and Urogenital 293655 293655 0 0
Kidney disease
Oral and Gastrointestinal 293690 293690 0 0
Other diseases of the mouth, teeth, oesophagus, digestive system including liver and colon

Study type
Description of intervention(s) / exposure
Periodontal treatment, including scaling, root planing and extraction of teeth considered unable to be saved. Sessions will take between 30 to 60 minutes and will occur at three time points by a registered dental professional. The time points will be baseline, 1 month and 2 months (that is, each session separated by a month)
Intervention code [1] 290497 0
Treatment: Surgery
Intervention code [2] 290529 0
Treatment: Other
Comparator / control treatment
No peridontal intervention
Control group

Primary outcome [1] 293467 0
Renal function as assessed by analysis of serum creatinine and estimated Glomerular Filtration Rate (eGFR).
Timepoint [1] 293467 0
three, twelve and twenty-four months
Secondary outcome [1] 311109 0
Progression of cardiovascular disease as assessed by carotid intima media thickness (cIMT). CIMT will be assessed by ultrasonography of carotid arteries.
Timepoint [1] 311109 0
three, twelve and twenty-four months
Secondary outcome [2] 311180 0
Timepoint [2] 311180 0
three, twelve and twenty-four months

Key inclusion criteria
Aboriginal adults living in Central Australia with chronic kidney disease
Minimum age
18 Years
Maximum age
No limit
Both males and females
Can healthy volunteers participate?
Key exclusion criteria
Unable to sign informed consent form

Study design
Purpose of the study
Allocation to intervention
Randomised controlled trial
Procedure for enrolling a subject and allocating the treatment (allocation concealment procedures)
Enrollment through community health workers; allocation through a random number generator. Randomisation will be done using field staff laptop computers. The field staff will be required to register the participants in the trial prior to identifying the randomised group. These data will be unable to be altered, thus allowing the randomisation process to be audited.
Methods used to generate the sequence in which subjects will be randomised (sequence generation)
Allocation through a random number generator.
Masking / blinding
Open (masking not used)
Who is / are masked / blinded?

Intervention assignment
Other design features
Not Applicable
Type of endpoint(s)
Statistical methods / analysis
Analysis of covariance (ANCOVA) will be performed to determine differences in the primary outcome (renal function) between the two groups and over time, using a conservative F-test for the interaction between time and treatment. Death, a binary outcome, will be analysed using the chi-square test with frequencies and percentages per treatment arm and odds-ratios or other measures of treatment effect reported along as summary measures. The Greenhouse-Geisser correction for the F-test will be used to adjust the degrees of freedom for deviation from sphericity. Logarithmic transformation of the data will be performed where appropriate. A post hoc correlation analysis by the Spearman rank-correlation method will be performed to evaluate the relationship between the changes in renal function from baseline to three, twelve and twenty four months following periodontal therapy. Effect sizes will be calculated by dividing the mean of change scores by the pooled estimate of the standard deviation. Effect measures will also be presented through calculation of number-needed-to-treat and its associated 95% confidence interval. The statistically significant level will be at P<0.05.

Based on a recent study of Australian Aboriginal adults with periodontal disease, it was estimated that a sample size of 472 would be necessary to detect a 4% difference in cIMT (from 0.82 to 0.79 mm) at the significance criterion of 0.05 and a power of 0.80. Allowing for 20% attrition, 592 participants would be necessary at base-line, rounded to 600 for convenience.

Recruitment status
Date of first participant enrolment
Date of last participant enrolment
Date of last data collection
Sample size
Accrual to date
Recruitment in Australia
Recruitment state(s)
Recruitment hospital [1] 3091 0
Alice Springs Hospital - Alice Springs

Funding & Sponsors
Funding source category [1] 290156 0
Government body
Name [1] 290156 0
National Health and Medical Research Council (NHMRC)
Address [1] 290156 0
GPO Box 1421
Canberra ACT 2601
Country [1] 290156 0
Primary sponsor type
University of Adelaide
The University of Adelaide
Adelaide, South Australia
5005 Australia
Secondary sponsor category [1] 288865 0
Name [1] 288865 0
Address [1] 288865 0
Country [1] 288865 0

Ethics approval
Ethics application status
Ethics committee name [1] 291866 0
University of Adelaide Human Research Ethics Committee
Ethics committee address [1] 291866 0
The University of Adelaide
Adelaide, South Australia
5005 Australia
Ethics committee country [1] 291866 0
Date submitted for ethics approval [1] 291866 0
Approval date [1] 291866 0
Ethics approval number [1] 291866 0

Brief summary
The primary purpose of the study is to determine if comprehensive periodontal treatment reduces progression of kidney disease among Aboriginal Australians living in Central Australia with kidney disease. The study hypothesis is that periodontal treatment will reduce progression of kidney disease. Kidney disease is a growing public health concern in Australia, especially among Aboriginal populations. Kidney disease consumes disproportionate healthcare resources and is the most common cause of hospitalisation among Aboriginal Australians. In spite of the unacceptably high social, medical and financial burden caused by kidney disease, there have been few RCTs that explore the impact of treatment to address key risk factors, such as periodontal disease, on, kidney disease progression . As a consequence, the management armamentarium currently available to slow the kidney disease progression is extremely limited and only partially effective.
Trial website
Trial related presentations / publications
Public notes

Principal investigator
Name 52338 0
Prof Lisa Jamieson
Address 52338 0
The University of Adelaide
Adelaide, South Australia
5005 Australia
Country 52338 0
Phone 52338 0
+61 8 8313 4611
Fax 52338 0
Email 52338 0
Contact person for public queries
Name 52339 0
Prof Lisa Jamieson
Address 52339 0
The University of Adelaide
Adelaide, South Australia
5005 Australia
Country 52339 0
Phone 52339 0
+61 8 8313 4611
Fax 52339 0
Email 52339 0
Contact person for scientific queries
Name 52340 0
Prof Lisa Jamieson
Address 52340 0
The University of Adelaide
Adelaide, South Australia
5005 Australia
Country 52340 0
Phone 52340 0
+61 8 8313 4611
Fax 52340 0
Email 52340 0

No information has been provided regarding IPD availability
Summary results
No Results