Marginal adaptation of mineral trioxide aggregate (MTA) to root dentin surface with orthograde/retrograde application techniques: A microcomputed tomographic analysis

Abstract

Background:Achieving a good apical seal for root canals is known to be associated with good mineral trioxide aggregate (MTA) adaptation to dentin.Aims:This study aims to compare the marginal adaptation of MTA with root dentin between orthograde and retrograde application techniques using microcomputed tomography (micro-CT) analysis.Settings and Design:Fifty-two single-rooted human teeth were divided into four equal groups: (Group 1) Retrograde MTA (RMTA), (Group 2) Orthograde MTA (OMTA), (Group 3) Etched RMTA (ERMTA), and (Group 4) Etched OMTA (EOMTA).Materials and Methods:For Group 1, 3-mm retrograde cavities were prepared and filled with MTA. For Group 2, the apical 6 mm of the canals were filled with MTA and sealed with sealer cement and warm gutta-percha. In Groups 3 and 4, canals were treated the same as Groups 1 and 2, respectively, except that before placing the MTA, canals were irrigated with 17% ethylenediaminetetraacetic acid (EDTA). After 48 hours, all the teeth were analyzed using a micro-CT scanner.Statistical Analysis:Mean dentin-MTA contact and the mean length and width of each gap was analysed using one-way analysis of variance (ANOVA). Statistical significance was set at an α level of 5%.Results:No significant difference in gap volumes was observed in the dentin-MTA adaptation in both orthograde and retrograde application techniques. However, significant difference in the gap volumes was observed between RMTA and ERMTA (P = 0.045). Etching significantly improved the MTA-Dentin adaptation (P < 0.05). The type of application technique did not significantly improve the dentin-MTA adaptation, instead with the use of 17% EDTA, a significant improvement could be achieved.Conclusion:Within the limitations of the present study, it concludes that MTA adaptation to dentin tooth structure is not significantly different between an orthograde and retrograde approach. However, the use of EDTA significantly improved the MTA-Dentin adaptation.

An ex-vivo comparative study of root-end marginal adaptation using grey mineral trioxide aggregate, white mineral trioxide aggregate, and Portland cement under scanning electron microscopy

“…Considering the marginal adaptation of MTA to root dentin, a recent study[ 37 ] using microcomputed tomographic analysis has shown that the type of application technique (either orthograde or retrograde) do not significantly improve the dentin-MTA adaptation, instead with the use of 17% EDTA, a significant improvement could be achieved. In this study, a significant difference in the gap volumes was observed between retrograde MTA (RMTA filling without etching) and etched RMTA (ERMTA) (etching before retrograde filling) where etching significantly improved the MTA-dentin adaptation.…”

Survey of the frequency of apicoectomy and retrograde obturation

“…Commendable is the fact that almost half of the respondents use MTA for retrograde filling. MTA is believed to be a bioactive material with several favorable properties, such as stimulating cementum and hard tissue formation, and having an antibacterial effect due to its alkaline pH (10.2-12.5) (1,3,15). Newly introduced materials (Biodentine, Bioaggregate, iRoot BP Plus) have also shown comparable biocompatibility with a potential to provide favorable environment for the cell, showing cell proliferation and osteogenic capability but further research and clinical trials are required (16,17,18,19,20).…”

İnternal matriks ile birlikte kullanılan MTA’nın ortograd ve retrograd uygulanmasının farklı apikal açıklığa sahip dişler üzerindeki güçlendirme etkisinin değerlendirilmesi

“…22 açık apeksli dişlerin başarı oranlarını rapor ettikleri tarihsel kohort çalışma sonuçlarına dayanarak, açık apeksli dişler için en uygun tedavi seçeneği olarak apikal tıkaç oluşturmak için MTA'nın ortognatik yolla gönderilmesini önermektedirler. Al Fouzan ve arkadaşlarının 23 MTA'nın dentine adaptasyonunun değerlendirdikleri bir çalışmada, MTA'nın ortograd veya retrograd uygulamaları arasında istatistiksel olarak fark olmadığı sonucuna varmışlardır. Sunulan bu çalışmada, MTA'nın retrograd veya ortograd uygulamasının simüle immatür dişlerin kırılma dayanımına etkisinin incelenmesi amaçlanmıştır.…”