An in Vitro Evaluation of Antimicrobial Photodynamic Therapy on Deciduous Carious Dentin

Summary

Despite of the decline of dental caries, this disease is still common in polarized groups affecting children. Therefore, the aim of this randomized blind in vivo study was to compare the antimicrobial effect of two antimicrobial therapies in deciduous carious dentin. Thirty two patients aging from 5 to 7 years old had partial caries removal in deep carious dentin lesion in deciduous molar and were divided in three groups: 1. Control - chlorhexidine and resin modified glass ionomer cement (RMGIC); 2. LEDTB - antimicrobial photodynamic therapy (APDT) with LED (light emission diode) associated with toluidine blue orto dye solution and RMGIC; 3. LMB - APDT with laser associated with methylene blue dye solution and RMGIC. The patients were submitted to initial clinical and radiographic examination and demographic features were evaluated by biofilm, gingival, and dmft/dmfs indexes, besides clinical and radiographic follow up at 6 and 12 months after the treatments. The carious dentin was collected before and after each treatment and the number of Streptococcus mutans, Streptococcus sobrinus, Lactobacillus casei, Fusobacterium nucleatum, Atopobium rimae and total bacteria were established by quantitative PCR.

Conditions

• Dental Caries

Interventions

PROCEDURE

Rubber dam isolation

Tooth was isolated using a rubber dam isolation in order to collect the dentin samples

PROCEDURE

Tooth drying

The tooth was dried with air jet.

PROCEDURE

Dentin wash with chlorhexidine 2%

Partial carious tissue was removed with conventional dentinal curette and collection of dentin with a micropunch (Ø = 1mm) was performed. The remaining dentin was washed with chlorhexidine 2%. After that a a new dentin collection was performed at another site of the cavity, and restoration with resin-modified glass ionomer cement was placed.

PROCEDURE

Antimicrobial Photodynamic Therapy 1

Partial carious tissue was removed with conventional dentine curette and collection of dentin with a micropunch (Ø = 1mm) was performed. The remaining dentin was washed with 200 µL of O-Toluidine blue dye (0.1 mg/mL) for 60 s. After this, a red LED light source with wavelength of 630 nm was used at 100 mW power, 9.0 J of energy, for 60 s with energy density of 30.0 J/cm2 . A new dentin collection was performed after this treatment at another site of the cavity and restoration with resin-modified glass ionomer cement Vitremer was placed.

PROCEDURE

Antimicrobial Photodynamic Therapy 2

Partial carious tissue was removed with conventional dentine curette and initial collection of dentin with a micropunch (Ø = 1mm) was performed. Treatment of the remaining dentin was performed with 200 µL of methylene blue dye 0.01% for 5 min and after this, a red low level LASER light source with wavelength of 660 nm was used at 100 mW power, 9.0 J of energy, for 90 s with energy density of 320.0 J/cm2 . A new dentin collection was performed after this treatment at another site of the cavity and restoration with resin-modified glass ionomer cement was placed.

Sponsors & Collaborators

• Fundação de Amparo à Pesquisa do Estado de São Paulo

  collaborator OTHER_GOV

• University of Sao Paulo

  lead OTHER

Study Design

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Model

PARALLEL

Eligibility

Min Age

5 Years

Max Age

7 Years

Sex

ALL

Healthy Volunteers

Yes

Timeline & Regulatory

Start

2011-05-31

Primary Completion

2012-07-31

Completion

2014-01-31