Post and core

About: Post and core is a research topic. Over the lifetime, 697 publications have been published within this topic receiving 15887 citations.

Periapical status of endodontically treated teeth in relation to the technical quality of the root filling and the coronal restoration

Abstract: The purpose of this study was to evaluate the relationship of the quality of the coronal restoration and of the root canal obturation on the radiographic periapical status of endodontically treated teeth. Full-mouth radiographs from randomly selected new patient folders at Temple University Dental School were examined. The first 1010 endodontically treated teeth restored with a permanent restoration were evaluated independently by two examiners. Post and core type restorations were excluded. According to a predetermined radiographic standard set of criteria, the technical quality of the root filling of each tooth was scored as either good (GE) or poor (PE), and the quality of the coronal restoration similarly good (GR) or poor (PR). The apical one-third of the root and surrounding structures were then evaluated radiographically and the periradicular status categorized as (a) absence of periradicular inflammation (API) or (b) presence of periradicular inflammation (PPI). The rate of API for all endodontically treated teeth was 61.07%. GR resulted in significantly more API cases than GE, 80% versus 75.7%. PR resulted in significantly more PPI cases than PE, 30.2% versus 48.6%. The combination of GR and GE had the highest API rate of 91.4%, significantly higher than PR and PE with a API rate of 18.1%.

Resistance to fracture of endodontically treated teeth restored with different post systems.

Abstract: Statement of Problem. Very little is known about the resistance to fracture of endodontically treated teeth restored with newly developed esthetic post systems. Purpose. This in vitro study compared the effect of 1 titanium and 3 esthetic post systems on the fracture resistance and fracture patterns of crowned, endodontically treated teeth. Material and Methods. A total of 40 recently extracted human maxillary canines with their crowns removed were endodontically treated. Four groups of 10 specimens were formed. Teeth were restored with titanium, quartz fiber, glass fiber, and zirconia posts and numbered as groups 1, 2, 3, and 4, respectively. All posts were cemented with Single Bond dental adhesive system and dual-polymerizing RelyX ARC adhesive resin cement. All teeth were restored with composite cores, and metal crowns were fabricated and cemented with glass ionomer cement. Each specimen was embedded in acrylic resin and then secured in a universal load-testing machine. A compressive load was applied at a 130-degree angle to the long axis of the tooth until fracture, at a crosshead speed of 1 mm/min. One-way analysis of variance and a Tukey test were used to determine the significance of the failure loads between groups ( P 2 test was conducted for evaluation of the mode of failure ( P Results. The mean failure loads (kg) were 66.95, 91.20, 75.90, and 78.91 for groups 1 to 4, respectively. Teeth restored with quartz fiber posts (group 2) exhibited significantly higher resistance to fracture ( P P >.05). Fractures that would allow repair of the tooth were observed in groups 2 and 3, whereas unrestorable, catastropic fractures were observed in groups 1 and 4 ( P Conclusion. Within the limitations of this study, significantly higher failure loads were recorded for root canal treated teeth restored with quartz fiber posts. Fractures that would allow repeated repair were observed in teeth restored with quartz fiber and glass fiber posts. J Prosthet Dent 2002; 87:431-7.

Intracoronal reinforcement and coronal coverage: A study of endodontically treated teeth

Abstract: T echniques to reinforce endodontically treated teeth have been available for more than 100 years. However, few dentists have questioned the rationale that dictates automatic dowel reinforcement and coronal coverage of pulpless teeth. The difficulties of in vivo studies have motivated investigators to increase the number of in vitro studies of endodontically treated teeth. Although findings from in vitro studies provide guidelines, direct application of tensile, torque, and shear tests on experimental models or extracted teeth are questionable. This is particularly true if the elasticity of tooth structure, alveolar bone, and periodontal ligament is considered. The purpose of this study was to correlate clinical and laboratory studies of 1273 endodontically treated teeth in retrospect and determine the clinical significance of post reinforcement and coronal coverage. The location of the tooth in the arch and how it modifies the restorative requirements of an endodontically treated tooth are evaluated.

Ferrule design and fracture resistance of endodontically treated teeth.

Abstract: This study evaluated the fracture resistance of pulpless teeth with various ferrule designs and amounts of coronal tooth structure. One millimeter of coronal tooth structure above the crown margin substantially increased the fracture resistance of endodontically treated teeth, whereas a contrabevel at either the tooth-core junction or the crown margin was ineffective. The thickness of axial tooth structure at the crown margin did not appreciably improve resistance to fracture.

Clinical evaluation of fiber-reinforced epoxy resin posts and cast post and cores.

Abstract: PURPOSE This retrospective study evaluated treatment outcome of cast post and core and Composipost systems after 4 yrs of clinical service. MATERIALS AND METHODS 200 patients were included in the study. They were divided in two groups of 100 endodontically treated teeth restored with a post. Group 1: Composipost systems were luted into root canal following the manufacturer's instructions. Group 2: Cast post and cores were cemented into root canal preparations with a traditional technique. The patients were recalled after 6 months, 1, 2 and 4 yrs and clinical and radiographic examinations were completed. Endodontic and prosthodontic results were recorded. RESULTS Group 1: 95% of the teeth restored with Composiposts showed clinical success; 3% of these samples were excluded for noncompliance and 2% showed endodontic failure. Group 2: Clinical success was found with 84% of teeth restored with cast post and core. 2% of these samples were excluded for noncompliance, 9% showed root fracture, 2% dislodgment of crown and 3% endodontic failure. Statistical evaluation showed significant differences between Groups 1 and 2 (P < 0.001). The results of this retrospective study indicated that the Composipost system was superior to the conventional cast post and core system after 4 yrs of clinical service.