endodontically treated teeth restored with post and core face failure due to loosening of the post , fracture of the post or the root itself.1 the common post and core complications documented were post loosening ( 5% ) , root fracture ( 3% ) , caries ( 2% ) , and periodontal disease ( 2%).2 fracture of the coronal tooth structure can occur on anterior teeth as they are subjected to shear stresses . very often the post and core fails , leaving behind an intact crown . root may have adequate bone support and which could be favorably used if the post is retrieved . this clinical report describes the technique of refabricating post and core to match the features of the existing crown . a 34-year - old female patient reported with fractured maxillary right canine tooth ( figure 1 ) . on examination , it was found that the tooth was the root canal treated and restored with a cast post and core and a metal ceramic crown over it ( figure 2 ) . the core was fractured leaving the cast post embedded in the root.the post was loosened using ultrasonic vibrations and retrieved using an artery forceps . the residual cement in the post space was removed and a fiber post of diameter 1.5 mm ( flexi - post , coltenewhaledent ) was bonded using dual - cured composite resin ( paracore , coltenewhaledent ) ( figure 3).the crown was intact , and it was decided to use the same for restoring the fractured tooth . a 50 m polytetrafluoroethylene ( ptfe ) ( teflon ) tape was adapted on the tissue surface of the crown and a dual - cured core build - up composite resin ( paracore , coltenewhaledent ) was injected into the crown and positioned over the bonded post ( figures 4 - 6 ) .. it was then light polymerized for 40 s.the crown was then removed leaving the core bonded to the post and the tooth structure . the core was light polymerized again for 40 s. the teflon tape was removed from the crown , and the crown was cemented to the core using glass ionomer cement ( gic gold label glass ionomer luting and lining cement ) ( figure 7 ) .. the patient was followed up for 1 year , and it was uneventful . a 34-year - old female patient reported with fractured maxillary right canine tooth ( figure 1 ) . on examination , it was found that the tooth was the root canal treated and restored with a cast post and core and a metal ceramic crown over it ( figure 2 ) . the residual cement in the post space was removed and a fiber post of diameter 1.5 mm ( flexi - post , coltenewhaledent ) was bonded using dual - cured composite resin ( paracore , coltenewhaledent ) ( figure 3 ) . the crown was intact , and it was decided to use the same for restoring the fractured tooth . a 50 m polytetrafluoroethylene ( ptfe ) ( teflon ) tape was adapted on the tissue surface of the crown and a dual - cured core build - up composite resin ( paracore , coltenewhaledent ) was injected into the crown and positioned over the bonded post ( figures 4 - 6 ) .. it was then light polymerized for 40 s. the crown was then removed leaving the core bonded to the post and the tooth structure . the core was light polymerized again for 40 s. the teflon tape was removed from the crown , and the crown was cemented to the core using glass ionomer cement ( gic gold label glass ionomer luting and lining cement ) ( figure 7 ) .. the patient was followed up for 1 year , and it was uneventful . the need for retreatment of a tooth and/or prosthetic restoration may arise due to secondary caries , pulpal involvement , trauma to the restoration , and/or foundation , and subjective desires for a more aesthetic or durable restoration . crowned teeth requiring retreatment due to fracture of the underlying tooth structure and/or foundation restoration often possess an undamaged extracoronal restoration . in such cases , it may be desirable to reuse the restoration for the sake of cost and time.3 a badly distorted endodontically treated tooth is always a challenge for any dentist . presented a comprehensive literature review over this topic and described his own way to handle these emergencies . he inserted a prefabricated plastic post into the palatal canal of a maxillary molar . later on following an impression of the remaining tooth , already prepared for a crown was inserted into a fresh fabricated crown , followed by crown cementation.4 an indirect fabrication of two separate castings , first for the post and then fabricating the core for mandibular molars was suggested by sadan et al . this technique was similar to chiche s technique but worked on indirect fabrication method.5 cast post core systems accumulated stress within cast post cores and apical one - third region of the tooth . using fiber posts , the stresses were distributed to the cervical one - third region of the tooth and the supporting bone . specimens restored with fiber - reinforced post systems offered more homogenous stress distribution than cast posts as fiber posts possess a similar modulus of elasticity to that of dentin.6,7 hence , it was decided to use a glass fiber post for this case . the use of ptfe tape provides a space of approximately 50 m , which was used to accommodate the cement.8 in this paper , the most common difficulty in the clinical practice has been discussed . restoration for the endodontically treated teeth , where there is hardly no proper support for the post makes the work for the clinicians more complicated and challenging . this paper describes a novel technique for refabricating a post and core restoration for an existing crown using polyfluoroethylene tape .