Shear bond strength of resin modified glass ionomer cement following photodynamic therapy, Er,Cr:YSGG and chlorhexidine in hypoplastic primary teeth

Abeer A Alshami; Nozha M Sawan; Sanaa A Alhamed; Mohammad Helmi; Omer Saleh Ebrahim Mustafa; Eman I Alsagob

doi:10.1016/j.pdpdt.2021.102593

Shear bond strength of resin modified glass ionomer cement following photodynamic therapy, Er,Cr:YSGG and chlorhexidine in hypoplastic primary teeth

Photodiagnosis Photodyn Ther. 2021 Dec:36:102593. doi: 10.1016/j.pdpdt.2021.102593. Epub 2021 Oct 18.

Authors

Abeer A Alshami¹, Nozha M Sawan¹, Sanaa A Alhamed², Mohammad Helmi³, Omer Saleh Ebrahim Mustafa⁴, Eman I Alsagob⁵

Affiliations

¹ Department of Preventive Dental Sciences, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia.
² Diagnostic Science Department, Faculty of Dentistry, King Abdulaziz University, Riyadh, Saudi Arabia.
³ Department of Periodontics and Community Dentistry, College of Dentistry, King Saud University, Riyadh, Saudi Arabia.
⁴ Consultant Pediatric Dentist, Bahrain, Defence Force Hospital, Bahrain.
⁵ Department of Preventive Dental Sciences, College of Dentistry, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia. Electronic address: eialsagob@pnu.edu.sa.

PMID: 34673269
DOI: 10.1016/j.pdpdt.2021.102593

Abstract

Purpose: This study investigates the micro shear bond strength of resin-modified glass ionomer cement (RMGIC) bonded to hypoplastic teeth after the application of chlorhexidine (CHX), sodium hypochlorite (NaOCl), Er;Cr:YSGG and methylene blue mediated antimicrobial photodynamic therapy (APDT).

Methods: A total sample of 60 erupted and extracted hypoplastic teeth collected from < 16 years children were subjected to different conditioning protocols including control group that involved bonding of hypoplastic teeth with RMGIC; CHX and NaOCl groups that included hypoplastic enamel being treated with 0.2% CHX and 2% NaOCl solution for 30 s followed by rinsing and drying for 5 s, MB-PDT group involved methylene blue photosensitizer and Er,Cr:YSGG group. All specimens were processed for microshear bond strength in a universal tester. The fractured surface was examined using a stereomicroscope at 40 × magnification and categorized under adhesive, cohesive and mixed.

Results: The highest microshear bond strength was noted for the control group (∼29 MPa). Whereas the specimens conditioned by NaOCl showed the lowest microshear bond strength (∼17 MPa). Among the treatment groups, APDT showed the highest bond strength values (∼22 MPa) as compared to chemical disinfection protocols. However, Er, Cr:YSGG showed slightly lower microshear bond strength as compared to APDT. No significant difference was noted between CHX and NaOCl groups (p > 0.05). There was a statistically significant difference when all the groups were compared together (p < 0.05). Microscopic analysis revealed that specimens bonded after APDT showed the highest adhesive failures (70%). The highest cohesive failures were seen in NaOCl group (40%). The mixed type of failures was seen in the control groups with none appearing for chemical disinfection protocols.

Conclusions: This study concludes that APDT could be a potential therapeutic strategy for increasing the microshear bond strength of RMGIC to hypoplastic enamel.

Keywords: Hypoplastic teeth; Lasers; Microshear bond strength; Photodynamic therapy.

MeSH terms

Child
Chlorhexidine
Dentin
Glass Ionomer Cements
Humans
Lasers, Solid-State*
Materials Testing
Photochemotherapy* / methods
Photosensitizing Agents / therapeutic use
Tooth, Deciduous

Substances

Glass Ionomer Cements
Photosensitizing Agents
Chlorhexidine