Background. Since many years the in vitro electronic length determination has been obtained embedding extracted teeth in an alginate mass. It is possible that the dehydration of the material can influence the measurements; this event can happen especially if the measurements are multiple and different electronic apex locators (EAL) are tested. The aim of this study is to evaluate the efficacy of an alginate model in conditions of constant humidity and after drying out. Methodology. Fifty teeth have been selected and the crowns sectioned at the level of the CEJ; the roots have been embedded with the lip electrode of two EALs in an alginate mass into a closable slide box. At the beginning the working length (WL) was taken using the visual-tactile method (VT); as the alginate had hardened the teeth were measured with the units Apit and RootZX at t0, at t1 (after 1h) at relative humidity 100%, and at t2 (after 24h) leaving the alginate exposed to the air in order to dehydrate it. NaOCl had been injected into the canals. At the end the collected data were analyzed using the Student's t-test for paired samples. Results. The mean WL calculated values are here : (1) Apit t0=23,70(2,24); (2) Root t0=23,88(2,17); (3) Apit t1=23,61(2,25); (4) Root t1=23,78(2,17); (5) Apit t2=23,87(2,28); (6) Root t2=23,88(2,32); (7) VT=23,99(2,25). The following differences has been noted: 1 vs 2, 1 vs 5, 1 vs 5 (p<0,05); 4 vs 7 (p<0,01); 3 vs 4 (p<0,005); 1 vs 7, 2 vs 3, 3 vs 5, 3 vs 6, 3 vs 7 (p<0,001). Conclusions. At constant relative humidity the simplified alginate method results reliable to apprehend discrepancies between different devices; the Apit gives slightly shorter WL values than Root ZX. In desiccate conditions the measured values have been higher and are comparable to the VT method; it is also noteworthy that the differences between the two EAL disappear.

Evaluation of an experimental model of electronic working length measurement

ANGERAME, DANIELE;DE BIASI, MATTEO;
2009-01-01

Abstract

Background. Since many years the in vitro electronic length determination has been obtained embedding extracted teeth in an alginate mass. It is possible that the dehydration of the material can influence the measurements; this event can happen especially if the measurements are multiple and different electronic apex locators (EAL) are tested. The aim of this study is to evaluate the efficacy of an alginate model in conditions of constant humidity and after drying out. Methodology. Fifty teeth have been selected and the crowns sectioned at the level of the CEJ; the roots have been embedded with the lip electrode of two EALs in an alginate mass into a closable slide box. At the beginning the working length (WL) was taken using the visual-tactile method (VT); as the alginate had hardened the teeth were measured with the units Apit and RootZX at t0, at t1 (after 1h) at relative humidity 100%, and at t2 (after 24h) leaving the alginate exposed to the air in order to dehydrate it. NaOCl had been injected into the canals. At the end the collected data were analyzed using the Student's t-test for paired samples. Results. The mean WL calculated values are here : (1) Apit t0=23,70(2,24); (2) Root t0=23,88(2,17); (3) Apit t1=23,61(2,25); (4) Root t1=23,78(2,17); (5) Apit t2=23,87(2,28); (6) Root t2=23,88(2,32); (7) VT=23,99(2,25). The following differences has been noted: 1 vs 2, 1 vs 5, 1 vs 5 (p<0,05); 4 vs 7 (p<0,01); 3 vs 4 (p<0,005); 1 vs 7, 2 vs 3, 3 vs 5, 3 vs 6, 3 vs 7 (p<0,001). Conclusions. At constant relative humidity the simplified alginate method results reliable to apprehend discrepancies between different devices; the Apit gives slightly shorter WL values than Root ZX. In desiccate conditions the measured values have been higher and are comparable to the VT method; it is also noteworthy that the differences between the two EAL disappear.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2615253
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