Author(s):
1. Vladimir Biočanin, Stomatoloski fakultet, Pančevo, Serbia
2. Nemanja Vuković, Department of Oral surgery, Faculty of Stomatology, Pančevo, Serbia
3. Đorđe Pejanović , Univerzitet Privredna Akademija Novi Sad, Stomatološki fakultet u Pančevu, Serbia
4. Mihajlo Ostojić, Private practice, Belgrade, Serbia, Serbia
5. Veljko Kolak, Serbia
6. Đorđe Antonijević, Department of Anatomy, School of Dental medicine, Belgrade, Serbia, Serbia

Abstract:
Introduction Chronic periapical lesions present pathologic lesions located around the apices of non-vital teeth. The mainstay therapy of these lesions is endodontic treatment. However, if failure occurs, surgical intervention with concomitant retrograde canal obturation should be considered, especially if endodontic retreatment is impossible or has already failed and if root canal posts are present. Contemporary obturation materials have been extensively evaluated for their bioactivity and compatibility. Furthermore, most recent formulations of pure and enriched calcium silicate (Ca-silicate) and calcium aluminate (Ca-aluminate) have showed improved handling properties, shortened setting times, less discoloration and lower costs. Aim The aim of this study was to investigate the efficacy, on microscopic level, of retrograde root-end obturation using different formulations of Ca-silicate and Ca-aluminate cements by assessing the volume of the micro-gap between the cement and the dentin lining the prepared cavity. Methods This in vitro study was performed on 80 extracted incisors and canines. All teeth were endodontically treated and sealed. Subsequently, retrograde cavities were filled with one of the following materials: ProRoot MTA (Dentsply, Tulsa, OK, USA), Portland cement (Italcementi SPA, Bergamo, Italy), Ca-aluminate, Ca-aluminate with zirconium dioxide (ZrO2), Ca-aluminate with strontium fluoride (SrF2). In order to evaluate the volume of the micro-gap between the sealing material and the dentin of the retrograde cavity, the treated teeth were immersed in phosphate buffered saline for 30 days and subsequently radiographed using the computerised microtomography technique (μCT). Results Ca-aluminate with the addition of strontium-fluoride (SrF2) showed the lowest volume of micro gap (4.43x10-3 mm3) between cement and dentin wall (p=0.003; ANOVA). There were no statistically significant differences between the materials, even though some difference was recorded when Ca-aluminate with SrF2 and ZrO2 groups were compared to MTA and Portland cement groups. Discussion and Conclusions In our study, the quality of retrograde obturation was measured by μCT, which has been prooved as the most relevant, non-invasive method for assessment of tridimensional root-end obturation. The results showed the lowest micro-gap between dentin and cement in case of Ca-aluminate with SrF2, compared with MTA, Portland, Ca-aluminate and Ca-aluminate with ZrO2. This result could be explained by the unique property of hydratation process of Ca aluminate with SrF2, which continues even after initial setting. From the clinical standpoint, excellent tridimensional sealing of root-end disables bacterial leakage and prevents formation of pariapical lesions.

Key words:
calcium-aluminate,calcium silicate,dental cements,root-end obturation

Thematic field:
SYMPOSIUM B - Biomaterials and nanomedicine

Date of abstract submission:
29.07.2022.

Conference:
Contemporary Materials 2022 - Savremeni materijali

Abstract