![]() It is inserted into the canal while rotating and is taken to working length as determined by pre-treatment radiography. Ni–Ti PROFILE® is chosen according to that which approximates the canal size. It has been claimed that the increasing taper instruments have enhanced flexibility in the middle region and at the tip, and that the decreasing taper instruments provide a larger taper in the important apical region but make them stiff ( Bergmans et al., 2003).Īccording to authors who initially advocated rotary technique in primary teeth, the pulpectomy technique begins with a standard access and removal of coronal tissue ( Barr et al., 1999, Barr et al., 2000). In the progressive ProTaper system, the shaping files (S) have an increasing taper in the coronal direction, whereas the finishing files (F) have a decreasing taper. It has been reported that instruments with progressive tapers can shape canals more quickly than constant taper instruments ( Veltri et al., 2005). The shaft designs can be grouped according to taper into two categories: progressive or constant. Various designs for taper, blades, grooves, and tips have been suggested ( Bergmans et al., 2003). Manufacturers highlight their cleaning efficacy for root canal preparations, simple procedures, and decreased procedure times, which is especially important in children. ![]() Ni–Ti rotary instruments of different designs are available. reported that Ni–Ti rotary preparation for extracted teeth was faster than hand preparation but the canals were not as clean ( Silva et al., 2004). Several investigators have reported the advantages of preparation with rotary Ni–Ti instruments over the manual method for both experienced and inexperienced operators ( Nagaratna et al., 2006, Sleiman et al., 2007). They concluded that the use of Ni–Ti rotary files for root canal preparation in primary teeth was cost effective, faster, and resulted in consistently uniform and predictable fillings. Mechanical preparation of primary teeth utilizing Ni–Ti rotary files was first done by Barr et al. Negotiation and thorough instrumentation of bizarre and tortuous canals encased in roots programed for physiological resorption are the main challenges for pulpectomy ( Ahmed, 2013). ![]() Maintaining tooth function until it is naturally exfoliated. However, all these studies were done in permanent teeth.Ī practical pulpectomy technique for the primary teeth should include the following ( Kuo et al., 2006): The design and high flexibility of Ni–Ti files allow instruments to closely follow the original root canal path, especially in curved canals ( Esposito and Cunningham, 1995, Gluskin et al., 2001, Hidsmann et al., 2003, Sonntag et al., 2003). Numerous studies have reported that they could efficiently create smooth, predetermined funnel-form shapes with minimal risk of ledging and transportation ( Dantas, 1997, Esposito and Cunningham, 1995, Thompson and Dummer, 1997). Since most hand preparation techniques are time consuming and can lead to iatrogenic errors (i.e., ledging, zipping canal transportation, and apical blockage), much attention has been directed toward root canal preparation technique with Ni–Ti rotary instruments ( Walton and Torabinejad, 2002). Root canal preparation is performed with reamers, files, burs, sonic instruments, mechanical apparatuses, and with nickel–titanium (Ni–Ti) rotary file systems. Thus, success of pulpectomy depends on elimination of irrigation pathway by cleaning and shaping the root canals ( Yang et al., 1996). The primary objectives when cleaning and shaping the root canal system is to remove soft and hard bacteria-containing tissue, provide an irrigation path for to the apical third, instilling space for instruments, subsequent obturation, and retaining the integrity of radicular structures ( Cohen and Hargreaves, 2006). Although the morphology of root canals in primary teeth renders endodontic treatment difficult ( Schafer et al., 2006a, Schafer et al., 2006b), pulpectomies of primary teeth with severe pulpal involvement should be considered as the treatment of choice.īacteria play an essential role in the initiation and perpetuation of pulpal and periapical disease ( Dantas, 1997). One of the most important concerns in pediatric dentistry is the loss of necrotic primary molars leading to space loss.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |