Endodontic Retreatment by Removal of Metallic Post: A Case Report.

Endodontic retreatment is a considered as a comprehensive field, divided into various categories such as coronal disassembly, removing obturation materials, locating previously missed canals, etc. This field of endodontics has its own technologies and techniques that are required to achieve clinical success. Because the field of non-surgical retreatment is comprehensive, this case report will limit its focus to the removal of the post. Removal of posts from endodontically treated teeth is a major obstacle in the retreatment of teeth having recurrent pathology, which often leads to the extraction of a tooth that might have been saved with endodontic retreatment. This case report shows the non-surgical endodontic retreatment of incompletely obturated maxillary central incisors by removal of metallic posts.

Apical Third Horizontal Root Fractures in Anterior.

Horizontal root fractures are a type of traumatic dental injury. Horizontal root fractures are classified as apical third, middle third, and cervical third of the root based on the fracture line and on the degree of dislocation of the coronal fragment. The prognosis of the tooth depends on the patient’s age, stage of root growth, mobility of the coronal fragment and diastasis of the fragments. Proper clinical and radiographic examination should be done to reveal apical root fractures. Hence, the treatment plan can be decided depending on the type of fracture and extent of fracture line. This review was conducted to evaluate the apical third horizontal root fractures in order to determine the appropriate therapy.

Evaluation of resistance to displacement of metal posts with different lengths.

Aims and Objectives: to evaluate the resistance to displacement of metal intraradicular retainers of different lengths by means of the shear test. Material and Methods: Thirty-six maxillary central incisors were cross-sectioned at 16 mm from the root apex, endodontically treated and randomly divided into three groups that were treated as follows: G1 (control) preparation of 2/3 (10.6 mm) of the total root length; G2: preparation of 1/2 (8 mm) of the total root length and G3: preparation of 1/3 (5.3 mm) of the total root length. After canal preparation, a matrix was made of the coronal and radicular portions using Duralay to obtain metal intraradicular retainers. These retainers were cemented with zinc phosphate cement and subjected to the compression shear test in a Universal Test Machine (EMIC DL 2000) at a crosshead speed of 0.5 mm/minute. The results were subjected to statistical analysis by analysis of variance (ANOVA) and Newman- Keuls, which showed statistically significant difference (P < 0.01). Results: The means in Newtons and their respective standard deviations were: G1 = 972.05 (±81.36); G2 = 921.15 (±112.25); G3 = 686.66 (±113.02). Conclusion: It could be concluded that metal retainers of 2/3 and 1/2 the length of the root portion showed higher resistance to displacement values when compared with the group that had been prepared for 1/3 of the root length.