Regenerative endodontics procedure of an immature permanent mandibular molar with a necrotic pulp using biodentine: a 16 months radiographic follow-up.

An ideal scenario for a tooth in necrosis with immature root would be to continue root development after the regeneration of pulp tissue. We report a case, where the regenerative endodontic procedure (REP) was done using biodentine as a scaffold in an immature mandibular molar tooth.

Influence of continuous rotation or reciprocation of Optimum Torque Reverse motion on cyclic fatigue resistance of nickel-titanium rotary instruments.

AIM: To evaluate the resistance to cyclic fatigue of ProTaper Next (PTN; Dentsply Sirona, Ballaigues, Switzerland), Revo-S (Micro-Mega, Besançon, France), Mtwo (Sweden & Martina, Padova, Italy), Twisted Files (TF, SybronEndo, Orange, CA, USA) and EndoWave (J Morita Corporation, Osaka, Japan) used in continuous rotation or in reciprocation of Optimum Torque Reverse motion (OTR). METHODOLOGY: A total of 120 nickel-titanium files were tested. Twenty-four instruments for each brand were divided into two groups (n = 12) on the basis of the motion tested: continuous rotation (Group 1) or reciprocation of OTR motion (Group 2). Resistance to cyclic fatigue was determined by recording time to fracture (TtF) in a stainless steel artificial canal with a 60° angle of curvature and 5 mm radius of curvature. The TtF data were analysed by using two-way analysis of variance (anova) and Bonferroni's post hoc tests at 0.05. RESULTS: Mtwo and TF had significantly higher TtF when compared with all other instruments, both in continuous rotation and in reciprocation of OTR motion (P < 0.0001 and P < 0.05, respectively). No difference was observed between Mtwo and TF (P > 0.05), in both motions. PTN was associated with higher cyclic fatigue resistance than Revo-S and EndoWave, both in continuous rotation and in reciprocation of OTR motions (P < 0.0001). No difference was observed between Revo-S and EndoWave, in both motions (P > 0.05). Reciprocating OTR motion improved TtF of all instruments (P < 0.0001). CONCLUSIONS: Reciprocation of OTR motion improved significantly cyclic fatigue resistance of all instruments tested compared with continuous rotation. Mtwo and TF had significantly higher cyclic fatigue than the other instruments, in both continuous rotation and reciprocation of OTR motion.

Use of bioactive materials and limited FOV CBCT in the treatment of a replanted permanent tooth affected by inflammatory external root resorption: a case report.

BACKGROUND: Inflammatory external root resorption is one of the possible complications of replantation of an avulsed tooth. Several studies have shown that limited FOV CBCT is an efficient diagnostic support and in treatment planning of these cases in paediatric patients because of its high resolution combined with low radiation doses. The recent literature has suggested that Biodentine is an effective material for resolution of inflammatory root resorption. CASE REPORT: This article describes the successful therapy of a replanted tooth affected by inflammatory root resorption. In the present case, a CBCT exam was performed to detect the extent of the damage, and the canal was filled with Biodentine in the apical third. At present, the threated tooth is asymptomatic, and the twelve months follow-up examination showed healing of periradicular hard tissues.

Ectopic localization of Carabelli's tubercle. Review of the literature and description of two clinical cases.

The aim of this study is to describe 2 ectopic localizations of Carabelli's tubercle. Carabelli's tubercle or cusp is present, in a fair number of cases, in the vestibular walls of both first upper molars. Its size may vary. It is named after the Italian scientist Antonio Carabelli who first had described it in the first half of the 19(th) century. Carabelli's cusp has been often detected and studied in not hybridized ethnical groups, especially Eastern and Central Ameri-can groups, in which the evaluation of heritability and sex distribution is easier. It has been found that this cusp is not clinically important, it may only sometimes interfere with orthodontic treatments. It is seldom present in the second upper molars and almost never in the vestibular walls of either side of the second upper or lower molars. After a review of the literature showing that this cusp is more rarely present in Caucasian peoples, the authors describe 2 case reports with ectopic localization. This has never been found in recent literature and therefore it is to be considered absolutely rare.