It was concluded that the Tri Auto ZX was useful and reliable. The Tri Auto ZX measurements protected against overpreparation.

Endodontics dk Dental Traumatology 1SSN 0109-2502 Detection and measurement of endodontic root perforations using a newly designed apex-locating hand piece Zmener 0, Grimberg F, Banegas G, Chiacchio L. Detection and measurement of endodontic root perforations using a newly designed apex-locating handpiece. Endod Dent Traumatol 1999; 15: 182-185. 0 Munksgaard, 1999. Abstract-Access openings and lateral root perforations were prepared in 40 single-rooted extracted teeth. The distance to the perforations was measured visually and then with the Tri Auto ZX. The electronic device was used first in its apex-locating function and then in conjunction with its automatic reverse mechanism. On average, the electronically measured length was slightly shorter than the visually measured length (X0.05). When the automatic reverse mechanism was used, the values registered were either consistent with or slightly different (k0.5 mm) from the electronically measured length (D0.05). The results of this study revealed that the Tri Auto ZX detected and measured endodontic root perforations within a range of clinically acceptable variations.