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Y-MK1-431
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       7.5 Tips for Successful Length     Too lazy or extremely delayed movement is              Comparison of electronic length determination   To select the settings features, use the scrolling
       Determination                      indicated for the following reasons:                   versus radiography:                 bar (Fig. 19). (see 6 features in chapter 7.6.1)
                                                                                                 X-ray radiography represents two-dimensional
  en   Please review the below checklist to better   Symptom  Solution                           projection of three-dimensional root canal system.                      en
       understand any implausible measuring results and                                          There are some cases when the radiographic
       to take appropriate actions:        Obliterated root   • Check the comparative            length and the electronic length do not match.
                                           canal Impeding the   x-ray for hints.
       Too fast movement or even jumping to the apex is   conductive path and   • Catheterize with
       indicated for the following reasons:
                                           preventing normal device  ISO 06/ 08 file till the
                                           functioning.     working length.
        Symptom         Solution
        Excess liquid in the pulp  Dry the access cavity   Retreatment: Blockage   • Take an x-ray to
        chamber or root canal   with a cotton pellet/   by old canal filling   re-check and try to
        (rinsing solution, blood or  air-blower.  material residue,   completely remove the
        saliva), creating wrong   Wait until excess   impeding the conductive   old canal filling material
        conductive path and   bleeding can be stopped.  path and preventing   prior to measuring
        incorrect measurements             normal device                                                                             Fig. 19  Scroll between settings
                                           functioning
        Gingival proliferation   Isolate the access cavity
        can lead to direct contact  by:    Blockage by remnants   Completely remove              In the case of a lateral canal curvature the x-ray   To exit the Settings Menu, tap the back arrow icon
        with the  measuring   • adequate preparation   of a medicated   the remnants prior to    may  show a  shorter  working  length  than  with   or the RAYPEX  6 “home” icon (Fig. 20)
                                                                                                                                               ®
                                                                                                       ®
        file causing a short   filling     substance (e.g. calcium   measuring.                  RAYPEX  6.
        circuit and incorrect   • placing a rubber dam  hydroxide) impeding
        measurements    • electrocauterizing  the conductive path and                            Electronic length determined using RAYPEX  6
                                                                                                                                 ®
                                           preventing normal device                              is usually more accurate than the radiographic
        The measuring file   Carefully enlarge the   functioning
        contacting metallic   access cavity and isolate                                          length.
        restorations (crown,   with flow composite.   Extremely dry root   Rinse root canal with
        parapulpal post,   Widen carefully the   canal impeding the   irrigating solution such
        amalgam filling) may    opening at the top of the   conductive path and   as NaCl or NaOCl    7.6 Device Setup
        cause a short circuit and   crown  preventing normal device  and dry the access cavity
        incorrect measurements             functioning      with a cotton pellet/                To enter the Settings Menu, tap the settings icon
                                                            air-blower.                          (Fig. 18).


                                              WARNING
                                              In some cases precise determination of
                                              file position cannot be obtained.



                                           Special condition    May lead to shorter                                                  Fig. 20  Exit settings menu
                                           symptom: Exceptionally   measurement than the
                                           large apical foramen   actual length.
                                           due to lesion or
                                           incomplete formation
                                                                                                 Fig. 18  Tap the settings icon
                                           Root fracture or   May lead to incorrect
                                           perforation      measurements.





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