Effect of Truss Access and Artificial Truss Restoration on the Fracture Resistance of Endodontically Treated Mandibular First Molars

Mahmoud Y Abou-Elnaga; Moataz-Bellah A M Alkhawas; Hyeon-Cheol Kim; Ashraf S Refai

doi:10.1016/j.joen.2019.02.007

Effect of Truss Access and Artificial Truss Restoration on the Fracture Resistance of Endodontically Treated Mandibular First Molars

J Endod. 2019 Jun;45(6):813-817. doi: 10.1016/j.joen.2019.02.007. Epub 2019 Mar 22.

Authors

Mahmoud Y Abou-Elnaga¹, Moataz-Bellah A M Alkhawas², Hyeon-Cheol Kim³, Ashraf S Refai¹

Affiliations

¹ Department of Endodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt.
² Department of Endodontics, Faculty of Dental Medicine, Al-Azhar University, Cairo, Egypt. Electronic address: malkhawas@yahoo.com.
³ Department of Conservative Dentistry, School of Dentistry, Pusan National University, Busan, South Korea.

PMID: 30905571
DOI: 10.1016/j.joen.2019.02.007

Abstract

Introduction: This study evaluated the effects of traditional and truss access cavity preparations in addition to artificial truss restoration on the fracture resistance of endodontically treated mandibular molars.

Methods: A total of 66 recently extracted, intact mandibular first molars were collected from patients between 20 and 45 years of age. After the preparation of a mesio-occluso-distal cavity in all teeth, the teeth were randomly grouped into the following 4 groups according to the access cavity design: traditional access cavity, artificial truss restoration, truss access cavity, and control groups. Endodontic access cavities were performed in the experimental groups according to each treatment modality followed by instrumentation, irrigation, and obturation. After composite restoration, the teeth were subjected to a vertical occlusal force until fracture occurred. The data were statistically analyzed, and the fracture patterns were evaluated.

Results: First, a 1-way analysis of variance test analysis of the fracture resistance of the experimental groups showed nonsignificant differences among groups (P > .05). Second, the data were statistically analyzed using the Student t test to compare the fracture resistance of each experimental group with that in the control group. The control group had statistically significantly higher mean values for fracture resistance than the traditional access group and the artificial truss restoration group (P < .05). No statistically significant difference was recorded in the fracture resistance between the control group and the truss access cavity group (P > .05).

Conclusions: The truss access cavity preparation improved the fracture resistance of endodontically treated teeth with mesio-occluso-distal cavities, whereas the artificial truss restoration did not improve it.

Keywords: Artificial truss restoration; conservative access cavity; endodontic access cavity; fracture resistance; truss access cavity.

MeSH terms

Adult
Composite Resins
Dental Cavity Preparation
Dental Restoration, Permanent*
Dental Stress Analysis
Humans
Middle Aged
Molar
Tooth Fractures* / therapy
Tooth, Nonvital*
Young Adult

Substances

Composite Resins