Periodontal Disease Clinical Trial
Official title:
The Effects of Chlorhexidine/Thymol Varnish on the Abutment Teeth in Partial Denture Wearers.
Cervitec, a chlorhexidine based varnished has been proven to reduce caries risk in younger
populations. This study wants to investigate if the use of this product would reduce the
risk of losing abutment teeth on patients that are wearing partial dentures as the
literature has proven that these teeth are more prone to caries and periodontal disease.
The primary objectives of this research project are to:
1. Assess if the topical application of CHX/thymol varnish every three months on partial
denture abutment teeth results in a clinicallu significant decrease in any loss of
attachment compared to no application, and
2. Assess if the topical application of CHX/thymol vanirhs every three months on partial
denture abutment teeth results in a clinically significant decrease in carious lesion
development or progression compared to no application.
The secondary objectives of this research project are to:
1. Assess of the topical application of CHX/thymol varnish every three months on partial
denture abutment teeth compared to no application results in a clinically significant
difference in:
1. Bleeding on probing (BoP).
2. Plaque formation.
3. Periodontal pocket depths.
4. Microbial composition and GCF cytokine profile of the sub gingival environment.
5. The patients self perception of oral health.
- 2 baseline samples of the Gingival Crevicular Fluid (GCF) and the subgingival samples.
The first baseline sample will be done on the day of the first impressions and the
second one the day of denture fitting.
- The following information will be recorded on the CRFs: Silness and Löe Plaque index,
BoP, probing depth, clinical attachment level, LoA, Kennedy classification, material of
the partial denture and type of clasp (or no clasp) and ICDAS code.
- The patient will also fill in the OHIP-14 questionnaire (Oral Health Impact Profile) to
assess their self perception of oral health.
- A photograph of the abutment teeth and the partial denture will be taken.
- We will also take a full history of the patient including: name, DOB and medications.
- The GCF and subgingival sampled will be taken every 6 months on the appointment where
the varnish is applied.
- All the laboratory samples will be labelles with the same identification number that
the patient has been allocated and a date will also be written on it. All the samples
will be analysed in Plymouth and stored in a - 50°C freezer (the samples taken at the
University of Aberdeen will be stored in the same type of freezer and shipped
periodically to the Penninsula University for tests maintaining the same temperature
conditions). They will be testing the microbial composition and GCF cytokine profile of
the sub gingival environment
- All measurements will be reassessed at 12 months and 24 months. In addition to the
denture hygiene index: Budtz-Jørgensen (1977) Index (plaque accumulation on the
denture).
The data will be collected by one clinician in each dental school. All clinicians will be
calibrated appropriately.
Calibration: Before any examination starts we will assess the consistency of each examiner
(intra-exmainer) and also the variation between exmainers (inter-exmainer reproducibility).
Each examiner will independently examiner the same group of 20 subjects and compare his or
her findings. When findings contain major discrepancies, subjects should be recalled in
order that differences in diagnoses can be reviewed by the exmainers and resolved by group
discussion. If certain examiners consistently produce significantly different results from
the majority, and attmepts to correct their performance fail, they will be excluded from the
team. It will be made clear to all potential examiners, before these exmainations begin,
that ability to standardize examination results is not a measure of clinical skills (Oral
Health Surveys 4th edition. WHO. Geneva 1997) All the data will be recorded on the case
report forms (CRFs).
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