Background. Efficient canal preparation is the key to successful root canal treatment. This study aimed to assess the cleaning and shaping ability, preparation time and file deformation of rotary, reciprocating and manual instrumentation in canal preparation of primary molars.Methods. The mesiobuccal canals of 64 extracted primary mandibular second molars were injected with India ink. The samples were randomly divided into one control and three experimental groups. Experimental groups were instrumented with K-file, Mtwo in continuous rotation and Reciproc in reciprocating motion, respectively. The control group received no treatment. The files were discarded after four applications. Shaping ability was evaluated using CBCT. After clearing, ink removal was scored. Preparation time and file fracture or deformation was also recorded. Data were analyzed with SPSS 19 using chi-squared, Fisher’s exact test, Kruskal-Wallis and post hoc tests at a significance level of 0.05.Results. Considering cleanliness, at coronal third Reciproc was better than K-file (P < 0.001), but not more effective than Mtwo (P = 0.080). Furthermore, Mtwo leaved the canal cleaner than K-file (P = 0.001). In the middle third, only Reciproc exhibited better cleaning efficacy than K-file (P = 0.005). In the apical third, no difference was detected between the groups (P = 0.794). Regarding shaping ability, no differences were found between Reciproc and Mtwo (P = 1.00). Meanwhile, both displayed better shaping efficacy than K-file (P < 0.05). Between each two groups, there were differences in preparation time (P < 0.05), with Reciproc being the fastest. No file failure occurred.Conclusion. Fast and sufficient cleaning and shaping could be achieved with Mtwo and especially with Reciproc.

No abstract

Introduction:This study aimed to examine the effects of induced inflammatory tooth pain on anxiety level in adult male rats.Methods:The mandibular incisors of 56 adult male rats were cut off and prefabricated crowns were fixed on the teeth. Formalin and capsaicin were injected intradentally to induce inflammatory tooth pain. Diazepam treated group received diazepam 30 minutes before intradental injection. The anxiety-related behavior was evaluated with elevated plus maze test.Results:Intradental application of chemical noxious stimuli, capsaicin and formalin, significantly affected nociceptive behaviors (P<0.001). Capsaicin (P<0.001) and formalin (P<0.01) significantly increased the anxiety levels in rats by decrease in the duration of time spent in open arm and increase in the duration of time spent in closed arm. Rats that received capsaicin made fewer open arm entries compared to the control animals (P<0.05). Capsaicin (P<0.001) and formalin (P<0.01) treated rats showed more stretch attend postures compared to the control and sham operated animals. In diazepampretreated rats, capsaicin induced algesic effect was prevented (P<0.001).Conclusion:Inflammatory pulpal pain has anxiogenic effect on rats, whereas diazepam premedication showed both anxiolytic and pain reducing effects.

Introduction:Scleroderma, or systemic sclerosis, is a chronic connective tissue disease generally classified as one of the autoimmune rheumatic diseasesCase Presentation:A 58-year-old woman was informed of her scleroderma, while receiving oral prosthetic rehabilitation. Mouth opening limitation had unfortunately led to treatment interruption. The psychological load of the disease itself, along with dental treatment cessation, resulted in patient’s disappointment and social separation. Three hypnosis sessions were conducted for normalizing patient’s psychological status primarily, and for the facilitation of dental treatment, as well. The range of mouth opening changed from 3.7 to 6.2 cm, allowing for easier entrance of dental appliances into the mouth for completion of prosthetic rehabilitation. With the tooth prostheses in place, the patient gained more social confidence and started sharing her experience with other patients with the same condition.Discussion:This case illustrates that hypnosis therapy may prove beneficial for patients with limited mouth opening secondary to scleroderma, facilitating the prosthetic rehabilitation programs for both dental specialists and patients, with a secondary important impact on the patient’s social perception of himself.