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. 2021 Oct 17:18:37.
doi: 10.18502/fid.v18i37.7562. eCollection 2021.

Retention of Cast Posts Cemented with Two Commonly Used Conventional and Two Resin Cements and the Mode of Root Fracture Following Their Removal

Azadeh Hesarkhani  1 , Farnoush Fotovat  2 , Fatemeh Saneian  3 , Hosein Akbari  4 , Hanif Allahbakhshi  5
Affiliations

Retention of Cast Posts Cemented with Two Commonly Used Conventional and Two Resin Cements and the Mode of Root Fracture Following Their Removal

Azadeh Hesarkhani et al. Front Dent. .

Abstract

Objectives: This study aimed to compare the retention of cast posts cemented with four types of cements and assess the mode of root fracture following their removal. Materials and Methods: In this in vitro, experimental study, 48 upper central incisors were randomly divided into 4 groups of 12, and were endodontically treated. The fabricated cast posts in each group were cemented with zinc phosphate (Masterdent), glass ionomer (GI; Meron), Meta resin cement, and Panavia SA resin cement. A device was customized for post removal by a universal testing machine similar to WAM X pliers. The retention of cemented posts was measured by the pull-out test in a universal testing machine. Next, the teeth were macroscopically and microscopically inspected regarding the occurrence and sites of catastrophic fracture, cracks, or craze lines. Quantitative and qualitative data were analyzed by ANOVA, and Chi-square test, respectively (P<0.05). Results: ANOVA showed a significant difference in the mean retention of cements (P<0.001). Panavia provided the highest retention (278.6±34.9 N) followed by zinc phosphate (221.9±28.88 N), GI (161.3±60.7 N), and Meta (140.4±66.54 N). There was no significant difference between the groups regarding the pattern of root fracture (P=0.39). However, site and extent of fractures were significantly different among the groups (P<0.05). Conclusion: The conventional cements provided optimal retention and caused less root damage after post removal. Thus, cements providing adequate retention and allowing easier post removal are recommended for use in endodontically treated teeth with a possibility of requiring retreatment.

Keywords: Dental Cements; Endodontics; Post and Core Technique; Tooth Fractures.

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Figures

Fig. 1
Fig. 1
Simulating the periodontal ligament space by light body silicone impression material
Fig. 2
Fig. 2
(a) Preparation of acrylic pattern for cast posts. (b) Preparation and adjustment of cast posts
Fig. 3
Fig. 3
Device similar to WAM X pliers prepared for universal testing machine
Fig. 4
Fig. 4
Placement of specimens for pull-out test in the universal testing machine with load application at a crosshead speed of 1 mm/min
Fig. 5
Fig. 5
(a) Inspection of cracks under a light microscope. (b) Inspection of craze lines under a light microscope
See this image and copyright information in PMC

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