Μελέτη της αντοχής του προσφυτικού δεσμού μεταξύ βιοκεραμικών φυραμάτων και κυρίων εμφρακτικών υλικών του ριζικού σωλήνα
Creators: name: Δαλοπούλου, Αθηνά Ανδρέα
Publisher: name: Aristotle University of Thessaloniki
Year: 2023
Subjects: Αντοχή προσφυτικού δεσμού
Βιοκεραμικά φυράματα
Επικαλυμμένοι κώνοι γουταπέρκας
Push-out bond strength
Bioceramic sealers
Coated gutta-percha points

description: Σκοπός της παρούσας ερευνητικής μελέτης είναι η in vitro συγκριτική μελέτη της αντοχής του προσφυτικού δεσμού μεταξύ φυραμάτων (Totalfill BC Sealer [TF] και AH26 [AH] ) και κύριων εμφρακτικών υλικών (συμβατικοί κώνοι γουταπέρκας [Cgp] και Totalfill BC Points [TFgp]). Κατασκευάστηκαν 16 κυλινδρικά δοκίμια από πολυγαλακτικό οξύ (PLA) με τη βοήθεια 3D εκτυπωτή. Μετά από κατάλληλη επεξεργασία, πλήρωση και εγκιβωτισμό των δοκιμίων δημιουργήθηκαν 4 πειραματικές ομάδες: 1η: AH-Cgp, 2η: AH-TFgp, 3η: TF-Cgp, 4η: TF-TFgp. Aκολούθησε η διαδικασία κοπής τομών και η δοκιμασία εξώθησης. Παρατηρήθηκε στατιστικά σημαντική διαφορά στην αντοχή του προσφυτικού δεσμού μεταξύ φυραμάτων και κώνων γουταπέρκας. Συμπερασματικά, η αντοχή προσφυτικού δεσμού του ΑΗ26 ήταν σημαντικά υψηλότερη του Totalfill BC, ανεξαρτήτως κύριου εμφρακτικού υλικού. Το Totalfill BC Sealer σε συνδυασμό με τους αντίστοιχους κώνους εμφάνισε ελαφρώς υψηλότερη αντοχή προσφυτικού δεσμού απ’ ότι σε συνδυασμό με συμβατικούς, χωρίς στατιστικά σημαντική διαφορά.
description: The achievement of a hermetic, three-dimensional and gap-free filling of a root canal is one of the main purposes of endodontic therapy. It is a barrier to apical microleakage and it contributes to the elimination of any residual microorganisms. The bond strength of root canal sealers to either dentin or core materials seems to be a property of utmost importance for the integrity of the root-canal filling. Bonding of the sealer to dentine has been investigated thoroughly in the literature, however bonding of the sealer to core-materials has rarely been explored in detail. Recently, a new group of sealers, bioceramic sealers, were introduced and recommended for dental practice. The purpose of this study is to examine and compare the bond strength of a bioceramic (Totalfill BC Sealer [TF]) and an epoxy-resin sealer (AH26 [AH]) to different core materials (Conventional gutta-percha Points [Cgp] &amp; Totalfill BC Points [TFgp]). Sixteen cylindrical samples were made from polylactic acid (PLA) by a 3D printer. After appropriate preparation of the samples, 8 of them were filled with the pre-mixed Totalfill® BC Sealer and 8 with AH-26 Sealer. They were combined with the two different core materials, in a way to create 4 experimental groups: 1st: AH-Cgp, 2nd: AH-TFgp, 3rd: TF-Cgp, 4th: TF-TFgp. The samples were then placed in an incubator, at 37°C, in 100% humidity for 7 days in order sealers to be set. The specimens were embedded in liquid epoxy resin in order to increase their stability. Each sample was horizontally sectioned into 1.0±0.1 mm- thick slices using a water-cooled precision microsaw on an Isomet testing machine (Isomet Buehler, Massachusetts). Overall, this procedure yielded 76 slices for the push-out test. The coronal and apical diameter of each slice of gp point was measured with Image J software. Each slice was placed in a universal testing machine (Ultratester TM, Ultradent, South Jordan, USA). Each specimen was carefully positioned on a metal platform with the apical diameter facing the proper plugger of the apparatus in order to perform the push out test. A statistically significant difference in the mean values of the push out bond strength of groups AH+Cgp – TF+Cgp (9,3 vs 0,73) and ΑH+TFgp – TF+TFgp (13,7 vs 2,5) was recorded respectively. On the contrary, a very small and not statistically significant difference was noted between groups Totalfill- TFgp and Totalfill - Cgp (2.5 and 0,73 Mpa respectively).The results of the present study are a strong indication that the bond between the Totalfill BC sealer and the coated cones is significantly weaker than the bond between AH26 sealer and conventional guttapercha points. Although further documentation is required, the current results seem to effectively disprove the claims made by the Totalfill BC Sealer and Totalfill BC points manufacturers. The clinical implications of the aforementioned results could lead to significant micro-gaps and compromised adhesion. Finally, the adhesive superiority of AH26 sealer was confirmed from the present findings.