1,720,967 research outputs found
Conservative therapy of non carious cervical lesion (NCCL): original method
No full textAIM: The process of twisting has been used for decades to fabricate stainless steel instruments, but it was previously thought to be an impractical method for nickel-titanium (Ni-Ti) instrument manufacture A manufacturing method of twisting Nickel-Titanium wire to produce Ni-Ti files has been recently developed: the twisted files (TF). Theoretically, this new manufacturing process should overcome the problems associated with a grinding process, which previously limited instrument strength. Since TF manufacturing process is new and different from grinding, the aim of the present study was to evaluate the effects of a final deoxidation process (Deox) on torsional resistance of TF instruments. METHODS: Testing was performed in accordance with the International Standard (ISO 3630-1) by comparing 20 TF instruments versus 20 TF prototype instruments produced without the final deoxidation process. Data were collected and statistically analyzed (t-test). RESULTS: Results show that TF instruments withstood 90% more torque (max. torque) than TF prototype instruments manufactured without the deoxidation process (88.7 vs. 53.3 g/cm). This difference was found to be statistically significant at the 0.05 level of significance. CONCLUSION: Since design and dimensions of tested instruments were the same, the deoxidation process could be the only explanation of the improvement in torsional resistance
SELF-BONE GRAFT AND SIMULTANEOUS APPLICATION OF IMPLANTS IN THE UPPER JAWBONE. (FIT LOCK TECHNIQUE)
No full textSurgical endodontic therapy: retrofilling of apex with amalgam and SuperSeal. Retrospective study.
No full textThe aim of this study was to make a retrospective analysis on teeth with apicectomized roots, closed off by retrograde with amalgam and SuperSeal-Ogna® (cement oxide of zinc and eugenol modified by acidity ethoxy-benzoic acid), in order to achieve clinical evaluation and radiographic evidence of treated dental elements and surrounding tissue SuperSeal (Ogna®). The study was conducted on 420 teeth, single and multi rooted, pertaining to 366 patients (189 women and 177 men) endodontically treated, in between 1998 and 2007. The teeth were treated with endodontic technique step-back and closed off with gutta-percha. Following the roots were apicectomyzed and then was prepared a retrograde cavity using retrotip steel mounted on the ultrasonic device. After carrying out the retrograde cavity all the samples were divided into two groups . The retrograde filling in Group A was made in Superseal, group B with amalgama. Both groups were divided in those teeths who was treated with use of optical microscope and in groups of teeths preformed without microscope. Nevertheless amalgam against the SuperSeal offers almost the same quality of the seal and the same prognosis. However SuperSeal as a material of choice, proved excellent, for carrying out the retrograde fillings free of some side effects, such as dimensional instability, mercury poisoning and pigmentation of tissues (tattoos from amalgam). In any case, whatever the type of material is, the operative microscope significantly affects the occurrence of failure. This demonstrates the importance of the microscope in order to obtain greater visibility and accuracy of the apex seal, more than minor sacrifice of healthy tissue
ABSTRACT 2010 del Congresso Nazionale dei Docenti di Discipline Odontostomatologiche, Chieti 21-23 Aprile A BONE SEQUESTER AFTER PLACEMENT OF DENTAL IMPLANTS: CASE REPORT
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IMPLANT SUPPORTED PROSTHETIC REHABILITATION IN POST ONCOLOGICAL PATIENTS. CASE REPORT OF A PATIENT OPERATED FOR A MANDIBLE RESECTION AFTER OSTEORADIONECROSIS
No full textDIFFERENT REHABILITATIVE APPROACHES IN POST-ONCOLOGICAL PATIENTS. TWO CASE REPORTS OF PROSTHETIC REHABILITATION AFTER UPPER JAW ONCOLOGICAL SURGERY
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