Primary assessment of a self‐adhesive gutta‐percha material

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Abstract
Aim: To evaluate a prototype gutta‐percha material (Bio‐Gutta), which is claimed to work without sealer because of its incorporated ultrafine bioactive glass particles, in terms of its induction of pH and calcium phosphate (CaP) precipitates, and its self‐adhesiveness in root canals.Methodology: Bio‐Gutta was compared with conventional gutta‐percha (GP, composition: 70 wt% ZnO, 30 wt% polyisoprene). Test and control materials (N = 3) were immersed in phosphate‐buffered saline (PBS) at 37 °C for 30 days. The pH in the solution was monitored. Apparent CaP formation was assessed using scanning electron microscopy (SEM). The root canals of 33 single‐rooted teeth were filled by vertical compaction of heated Bio‐Gutta, 33 control canals were filled with vertically compacted GP without sealer. Push‐out bond strengths associated with the filling materials in root cross‐sections from middle root thirds was determined 1, 8, and 30 days after root filling (N = 11 per group). These values were compared between groups using one‐way anova (α < 0.05).Results: Bio‐Gutta induced a high pH in the PBS solution, which plateaued at values between 11.4 and 11.8. Apparent CaP crystals covered the Bio‐Gutta material after 30 days of immersion in PBS, whilst no such structures were observed on GP. Both materials under investigation had similar initial push‐out bond strength values (P > 0.05). The adherence of Bio‐Gutta increased from day 1 to 8 and was significantly higher than that of conventional GP at 8 and 30 days (P < 0.05).Conclusions: The experimental gutta‐percha material under investigation was alkaline and caused CaP precipitates on its surface. It improved its adherence to the root canal wall within 1 week.

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