Prevention of Enamel Demineralization by Use of K18-smooth Surface Sealant

Dental Caries Clinical Trial

— K18  

Official title:

Prevention of Enamel Demineralization in Fixed Appliance Orthodontic Patients Using UDMA-K18 Sealant to Prevent Microbial Attachment Compared to a UDMA Control and no Sealant, a Randomized Split Mouth Clinical Trial

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03306433
• Other study ID #: 17-0633
• Status: Completed
• Phase: N/A
• Start date: January 8, 2018
• Est. completion date: December 7, 2018

Study information

• Verified date: September 2021
• Source: University of Colorado, Denver
• Contact: n/a
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

This study will evaluate effectiveness of a urethane dimethacrylate (UDMA)-quaternary ammonium methacrylate (K18) resin (UDMA-K18) smooth surface sealant to prevent biofilm attachment to tooth surfaces thereby eliminating the possibility for the tooth to be demineralized. The hypothesis is that UDMA-K18 containing smooth surface sealant will be more effective at reducing enamel demineralization than the UDMA control or no treatment.

Description:

Esthetics is a motivating factor to seek orthodontic treatment. However, if oral hygiene is inadequate during fixed appliance wear, unsightly white spot lesions (WSL) may develop. WSLs are areas of enamel demineralization that develop due to microbial assault that manifest as white, chalky opacity on the enamel. Urethane dimethacrylate (UDMA) can be modified to produce an antimicrobial compound, UDMA-K18, that has been proven to decrease microbial attachment in-vitro. (Sticker 2016) The use of a UDMA-K18 containing sealant may help to eliminate the development of WSLs around orthodontic brackets.

This study will place experimental or control smooth surface resins on teeth that are scheduled to be extracted for orthodontic reasons. These teeth are typically bicuspids that are to be extracted to create room for the orthodontic movement of teeth. These teeth are usually not extracted at the advent of first orthodontic bracket bonding but are extracted about 30 days later. The design of this study is to place sealants on those teeth (or as control, no sealant) and evaluate the teeth after they have been extracted.

Design: The study is a prospective, paired randomized control trial for which treatment (no sealant, UDMA-control, or UDMA-K18 sealant) will be applied clinically and evaluated on extracted teeth in laboratory conditions.

Procedures: Before bonding, one premolar per patient will be assigned to a group. The group each premolar is assigned to will be determined by a randomized, computer generated program. The allocation will be concealed in an opaque envelope that will be opened at the time of initial bonding. If a fourth premolar is planned for extraction, a random selection of the treatments will be selected in a 1:1:1 ratio and this treatment will be applied to the fourth premolar.

At the time of initial bonding, the UDMA and UDMA-K18 sealant will be applied to the selected premolar following manufacturer instructions. Briefly, the clinician will isolate the teeth using the NOLA Dry Field System and excess saliva will be removed by drying the teeth with an air-water syringe. In the treatment group, 37 % Phosphoric Acid will be applied to the entire buccal surface for 30 seconds, rinsed, and dried. Next, the assigned sealant will be evenly applied to the entire buccal surface of the premolar and light cured. The sealant which is adhesive will be applied to the bracket pad and the bracket pad will be pushed to place, excess cement will be removed and light cured.

In the control group, 37 % Phosphoric Acid will be applied for 30 seconds strictly to the area where the bracket will be bonded on the buccal surface, rinsed, and dried. No sealant will be applied. The adhesive sealant will be applied to the bracket pad and the bracket pad will be pushed to place, excess cement will be removed and light cured. After 3-6 weeks, the patient will have their premolars extracted. After extraction they will be placed in a Tooth Storage Solution (25 % ethanol, 75 % water with the addition of saturated hydroxyapatite, 20 mg of NaN3, and 40 mg Thymol) that is antimicrobial and does not alter the tooth surface. These teeth will be collected by the investigators for histologic study.

The collected, extracted teeth will be sectioned using a water-cooled, Buhler slow speed diamond saw in three 2mm sections through the bracket base. A polarized light microscopy (PLM) digitized photograph of the cross-sectional sample will be analyzed to determine the depth of lesions, if present. The mineral density profile will be analyzed using contact micro radiography (TMR).

Recruitment information / eligibility

• Status: Completed
• Enrollment: 16
• Est. completion date: December 7, 2018
• Est. primary completion date: December 7, 2018
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: All
• Age group: 12 Years to 89 Years

Eligibility

Inclusion Criteria:

• Orthodontic patients at the Department of Orthodontics Clinic, School of Dental Medicine, University of Colorado who agree to consent to this study.

• Orthodontic treatment plans that include fixed appliances from the second premolar to second premolar in both arches.

• Orthodontic treatment plans that include extractions of at least 3 bicuspids at about 1 month after bracket placement.

• The patient has adequate oral hygiene

Exclusion Criteria:

• Evidence of decalcification or restorations on any of the premolars planned for extraction prior to orthodontic treatment,

• Pregnant women (self reported)

• Any condition that contraindicates orthodontic treatment,

• Not willing to consent to the study.

Related Conditions & MeSH terms

• Dental Caries

Intervention

Device:
• UDMA-K18 smooth surface sealant
The K18 as part of the UDMA polymer network (UDMA-K18) is hypothesized to prevent microbial attachment to the surface.

Locations

Country	Name	City	State
United States	University of Colorado, School of Dental Medicine	Aurora	Colorado

Sponsors (2)

Lead Sponsor	Collaborator
University of Colorado, Denver	University of Colorado School of Dental Medicine

Country where clinical trial is conducted

United States, 

References & Publications (4)

Gong SQ, Niu LN, Kemp LK, Yiu CK, Ryou H, Qi YP, Blizzard JD, Nikonov S, Brackett MG, Messer RL, Wu CD, Mao J, Bryan Brister L, Rueggeberg FA, Arola DD, Pashley DH, Tay FR. Quaternary ammonium silane-functionalized, methacrylate resin composition with antimicrobial activities and self-repair potential. Acta Biomater. 2012 Sep;8(9):3270-82. doi: 10.1016/j.actbio.2012.05.031. Epub 2012 May 29. — View Citation

Liu SY, Tonggu L, Niu LN, Gong SQ, Fan B, Wang L, Zhao JH, Huang C, Pashley DH, Tay FR. Antimicrobial activity of a quaternary ammonium methacryloxy silicate-containing acrylic resin: a randomised clinical trial. Sci Rep. 2016 Feb 23;6:21882. doi: 10.1038/srep21882. — View Citation

Schmuck BD, Carey CM. Improved Contact X-Ray Microradiographic Method to Measure Mineral Density of Hard Dental Tissues. J Res Natl Inst Stand Technol. 2010 Apr 1;115(2):75-83. Print 2010 Mar-Apr. — View Citation

Wefel JS, Harless JD. Comparison of artificial white spots by microradiography and polarized light microscopy. J Dent Res. 1984 Nov;63(11):1271-5. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Change in Mineral Density Determined by the Canary Caries Detection System	The mineral density immediately below the surface of the tooth will lower if left unprotected to some extent.	Visit Window: 3-4 weeks.
Secondary	White Spot Lesion (WSL) Index	The WSL Index is from 0 (no lesion) to 4 (severe lesion)	Visit Window: 3-4 weeks.