Journal of Isfahan Dental School

A Comparison of Tooth Discoloration Following Root Canal Treatment with Traditional, Conservative, and Ultraconservative (Ninja) Access Cavity Designs

Document Type : مقاله‌های پژوهشی

Authors

1 Associate Professor, Department of Endodontics, Oral and Dental Disease Research Center, School of dentistryDentistry, Shiraz University of Medical Sciences, Shiraz, Iran

2 Associate Professor, Department of Endodontics, School of dentistryDentistry, Shiraz University of Medical Sciences, Shiraz, Iran

3 Assistant Professor, Department of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran

4 Postgraduate Student, Department of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran

5 Professor, Department of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran

Abstract

 Introduction: This invitro study aims to compare the discoloration in endodontically treated and restored anterior teeth with a traditional endodontic cavity (TEC), conservative endodontic cavity (CEC), and “ninja” or ultraconservative (NEC) endodontic access cavity.
Materials and Methods: In this experimental laboratory study conducted in Shiraz Dental Faculty in 2018, 46 intact human maxillary anterior teeth were randomly assigned to 5 groups. Three experimental groups, TEC, CEC, NEC (n = 12), and two control groups: positive (D) and negative (E) control groups (n = 5). Discoloration was assessed at the baseline (T = 0), after preparing the access cavity (T = 1), after endodontic treatment and restoration (T = 2), after one week (T = 3), after one month (T = 4), after three months (T = 5) and after six months (T = 6). Statistical analysis was performed using multi-sample repeated measures analysis of variance, one-way ANOVA, and Tukey test.
Results: In all groups, significant changes were observed in the discoloration over time (p value < 0.05). The NEC group had a significantly higher level of discoloration in ∆E1 (after preparing access cavity) and ∆E2 (after endodontic treatment and restoration). The NEC group had a significantly higher level of discoloration in ∆E3 (1 week) than The TEC group (p value < 0.05). ∆E4 (1 month), ∆E5 (3 months), ∆E6 (6 months) were not significantly different between the three experimental groups. The highest level of discoloration pertained to ∆E6 (1 month later) in all groups.
Conclusion: Despite statistically significant differences in the groups up to the first week, there is no significant difference in tooth color change with standard, conservative, and ultraconservative access cavities in the time intervals of 1 month, two months, and six months.
Keywords: Tooth discoloration; Spectrophotometry; Endodontically treated teeth

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Journal of Isfahan Dental School
Volume 20, Issue 2 - Serial Number 2
July 2024
Pages 137-147