Condition category
Oral Health
Date applied
Date assigned
Last edited
Prospectively registered
Overall trial status
Recruitment status
No longer recruiting

Plain English Summary

Background and study aims
Root caries are cavities that form on the roots of the teeth. Xerostomia (dry mouth) is considered as a primary cause for root caries in older people, as the reduction in saliva flow and resulting increase in mouth acidity leads to loss of minerals from the tooth surface. CPP-ACP is a type of protein derived from milk that enhances the action of fluoride. The aim of this study is to test two different dental varnishes containing fluoride with or without CPP-ACP for the treatment of root caries in patients with xerostomia.

Who can participate?
Patients aged 18 and over attending the Dry Mouth clinic at the Barts and The London Dental hospital or the Diabetic clinic.

What does the study involve?
The participants are randomly divided into two groups. One group is treated with dental varnish containing fluoride. The other group is treated with dental varnish containing fluoride and CPP-ACP. At the start of the study all participants undergo assessments of mouth dryness, saliva, root caries and plaque, and the varnish is applied. The saliva test, root caries and plaque assessment and varnish application are repeated at follow-up visits are after 3, 6 and 12 months.

What are the possible benefits and risks of participating?
Participants will benefit from a clinical examination of their mouth which will verify if they are suffering from oral dryness or root decay. Participants will receive varnish application which is a pain-free treatment, oral hygiene instructions, and free standard toothpastes with medium toothbrushes during the study period. There are no reported side effects related to the use of dental varnishes for the management of tooth decay. The only issue is that the dental varnish may fail to manage your root decay, subsequently either restorative treatment (“drilling and filling”) or extraction of the decayed tooth may be required.

Where is the study run from?
NHS Trust, Barts and The London Dental Hospital, School of Medicine and Dentistry (UK)

When is the study starting and how long is it expected to run for?
June 2016 to January 2018

Who is funding the study?
Queen Mary University of London (UK)

Who is the main contact?
Dr Ahmed Mustafa

Trial website

Contact information



Primary contact

Dr Ahmed Mustafa


Contact details

Queen Mary University of London
School of Medicine and Dentistry
Dental Hospital
Barts and The London
E1 2AD
United Kingdom
+44 (0)740 595 5116

Additional identifiers

EudraCT number number

Protocol/serial number


Study information

Scientific title

The effect of dental varnishes with casein phosphopeptide–amorphous calcium phosphate (CPP-ACP) for the management of root caries in patients with xerostomia: a 12-month randomised clinical trial


Study hypothesis

There is a difference in the efficacy between two dental formulas either containing CPP-ACP and fluoride or fluoride only on the management of root caries in Xerostomia patients.

Ethics approval

Office for Research Ethics Committees Northern Ireland (ORECNI), 07/06/2016, 16/NI/0101

Study design

Randomised double-blinded controlled clinical trial

Primary study design


Secondary study design

Randomised controlled trial

Trial setting


Trial type


Patient information sheet

Not available in web format, please use the contact details below to request a patient information sheet


Root caries


1. Test group will receive dental varnish with CPP-ACP and fluoride (MI varnish, GC)
2. Control group will receive dental varnish with fluoride only (NUPRO Varnish, DENTSPLY)

After the recruitment phase each participant will undergo baseline assessments including oral dryness scoring, saliva test, root caries assessment, plaque index and dental varnish application.

Follow-up visits will be after 3, 6 and 12 months. The saliva test, root caries assessment, plaque index and varnish application will be repeated though these three visits.

Intervention type



Drug names

Primary outcome measure

Change in root caries severity index (scores 0, 1, 2, 3 and 4) at baseline and after 3, 6, and 12 months

Secondary outcome measures

1. Change in texture, hardness, cavitation, colour, size and distance from the gingivae at baseline and after 3, 6, and 12 months
2. Change in the fluorescence values at baseline and after 3, 6, and 12 months
3. Correlation of the severity index and fluorescence values at baseline and after 3, 6, and 12 months
4. Correlation of the severity index and saliva properties, including buffering capacity and resting pH, at baseline and after 6 and 12 months
5. Correlation of the severity index and plaque index at baseline and after 3, 6, and 12 months

Overall trial start date


Overall trial end date


Reason abandoned (if study stopped)


Participant inclusion criteria

1. Participant is willing and able to give informed consent for participation in the trial
2. Male or female ≥ 18 years of age
3. Minimum one primary root caries (PRC), which is accessible for the diagnostic procedure
4. Participants who agree to return for assessments during the study period
5. Participants who are capable of giving informed constant
6. Saliva sample test showing a quantitative change in unstimulated whole saliva; ≤0.16 mL/min
7. Ability to carry out oral hygiene practice instruction
8. Participants who agree to use the standard dentifrice (Aquafresh, GSK, 1450 ppm fluoride) with a medium sized toothbrush (Oral-B) that will be provided by the research team
9. Participants are not involved another other clinical study investigating the oral care products
10. Participants not using any other mouthwash/dentifrice/gels/chewing gums/lozenges containing test ingredients and fluoride
11. In the Investigator’s opinion, is able and willing to comply with all trial requirements
12. Willing to allow his or her General Practitioner and consultant, if appropriate, to be notified of participation in the trial
13. Medically allowable to undergo the baseline and follow-up assessments

Participant type


Age group




Target number of participants

80 participants with 40 for each group

Participant exclusion criteria

1. No active primary root carious lesions
2. Presence of chronic/aggressive periodontal disease concerning the test tooth in the study tooth (purulent exudates, tooth mobility, and/or extensive bone loss)
3. Participation in another dental study testing different dental products during the previous three months and during the study period
4. Any condition, which in the opinion of the investigator, would preclude participation by the subject (such as cross-infection control risk)
5. Cognitive defect due to mental illness, depression, Alzheimer's disease, or dementia
6. Secondary root carious lesion
7. Hypersensitivity to either milk or one of the test products
8. Test tooth with untreated cavitated proximal or occlusal caries
9. Patient using any other topical agent that may affect the results such as mouthwash, chewing gum and lozenge with active ingredients or antibacterial agents
10. Female participant who is pregnant, lactating or planning pregnancy during the course of the trial
11. Significant renal or hepatic impairment
12. Scheduled elective surgery or other procedures requiring general anaesthesia during the trial
13. Any other significant disease or disorder which, in the opinion of the Investigator, may either put the participants at risk because of participation in the trial, or may influence the result of the trial, or the participant’s ability to participate in the trial
14. Participants who are prescribed for long-term systematic antibiotics

Recruitment start date


Recruitment end date



Countries of recruitment

United Kingdom

Trial participating centre

NHS Trust, Barts and The London Dental Hospital, School of Medicine and Dentistry
E1 2AD
United Kingdom

Sponsor information


Queen Mary University of London (UK)

Sponsor details

Mile End Road
E1 4NS
United Kingdom
+44 (0)207 882 5555

Sponsor type




Funder type


Funder name

Queen Mary University of London

Alternative name(s)

Queen Mary, QMUL

Funding Body Type

private sector organisation

Funding Body Subtype



United Kingdom

Results and Publications

Publication and dissemination plan

The 6 and 12 months outcomes mentioned above will be statistically analyzed to be published in dental journals and/or presented at conferences.

Intention to publish date


Participant level data

Not expected to be available

Basic results (scientific)

Publication list

Publication citations

Additional files

Editorial Notes

18/10/2017: Internal review. 14/07/2016: Ethics approval information added.