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J Dent Res Dent Clin Dent Prospects. 2022;16(2): 123-129.
doi: 10.34172/joddd.2022.021

Scopus ID: 85139925877
  Abstract View: 93
  PDF Download: 64

Clinical Dentistry

Original Article

Bond strength of conventional versus modified methods for Class IV restorations in primary incisors: An in vitro study

Naser Aslaminabadi 1 ORCID logo, Zohreh Halimi Tabrizi 1* ORCID logo, Ozra Golsanamlou 1 ORCID logo, Zohreh Estaki 2 ORCID logo, Zahra Jamali 3 ORCID logo

1 Department of Pediatric Dentistry, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
2 Department of Pediatric Dentistry, Faculty of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran
3 Department of Oral Medicine, Faculty of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
*Corresponding Author: Corresponding author: Zohreh Halimi Tabrizi, Email: , Email: zohreh7hlm@gmail.com

Abstract

Background. Aesthetic restorations of severely decayed anterior primary teeth are challenging due to the small size of the teeth and the large pulp chambers. Therefore, this study evaluated and compared the tensile and shear bond strengths of conventional versus modified methods (slot technique) of Cl IV restorations in primary incisors.

Methods. A total of 120 extracted intact maxillary primary central and lateral incisors were divided into two groups. In group A, conventional Cl IV cavities were prepared. In group B, after conventional cavity preparation, four and three incisal slots were prepared on the incisal edges of the central and lateral incisors, respectively. All the teeth were restored using composite resin, and then the tensile and shear bond strengths were evaluated.

Results. A statistically significant increase in the tensile bond strength of restorations was recorded in the modified technique compared to the conventional method (P=0.001). Although an increase in the shear bond strengths was found in the modified method, the value did not reach a statistically significant level (P=0.158). The most frequent fracture type was adhesive in the conventional group and cohesive in the modified group, considering the tensile and shear bond strength tests. In both groups, the highest average tensile bond strength was recorded in teeth with the cohesive fracture in dentin, and the lowest average was seen in the adhesive type.

Conclusions. Incisal slots could increase the tensile bond strengths of Cl IV composite resin restorations in primary teeth.

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Submitted: 03 Jun 2021
Revision: 29 Nov 2021
Accepted: 02 Mar 2022
ePublished: 15 Oct 2022
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