Efficiency of working length detection and irrigation during preparation of curved root canals
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Дата
2012-04
Автори
Boteva, E.
Yovchev, D.
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Издател
Централна медицинска библиотека, МУ София / Central Medical Library - MU Sofia
Резюме
Curved root canals are a challenge for instrumentation, preparation,
irrigation and obturation. The aim of the present study was to fi nd the working
length and irrigation effi ciency in root canals with curvatures 30º-45º and in root canals
with anatomical abnormalities 45º-90º. Sixty-eight human, matured, extracted
molars with 201 root canals were included in the study. Molars were placed in three
groups in relation to the angle between the root and the axis. The fi rst group of
molars – straight – 25º-30º, was the control group, n = 14 teeth – 45 root canals;
second group – 25-30º to 45º, n = 22 teeth with 66 root canals; third group – 45º to
90º (n = 31 teeth with 96 root canals). Measurements: mesio-distal buccal size of
the chamber in its largest part and both bucco-lingual sizes – the mesio dimension
was refered to as L1 and the distal one – as L2. Root canal preparation: extraction
of the root pulp with K endofi les number 6, 8, 10, with Step Down and Balance
force techniques. Canals length was measured rentgenologically using intraoral
radiography, preparation continued after X-ray analysis of the level of penetration of
irrigants with contrast solution of diluted Urograffi n 66%. Regime of active irrigation:
same for all groups with 2 % H2O2 and 1% NaOCl and paper points drying. To follow
up the results a fourth radiography was used and a second one with Urograffi n. The
applied criteria for working length and for penetration of the irrigant were as follows:
3 – whole working length, 2-1 mm shorter than the working length, 1-2 mm shorter
than the working length and 0 – more than 2 mm shorter than the working length.
X-ray – working length detection of molars with root canal curvatures was more
accurate, compared with straight roots, due to curved canals in straight roots and
inadequate instrumentation. The active irrigation was more effi cient in curved root
canals, because in straight canals most of the irrigant was lost back in the mouth or periapically. In straight root canals only moisturizing (Miller pins) the canal could be
more effective and less dangerous.
Описание
Address for correspondence:
Assoc. Prof. Dr. Ekaterina Boteva
Department of Conservative Dentistry
Faculty of Dental Medicine;
1 Georgy Sofi isky str.;
1431 Sofia, Bulgaria;
tel. ++359888328327 ;
e-mail: e_boteva@abv.bg
Ключови думи
endodontics, working length, curved root canals
Цитирания
E. Boteva and D. Yovchev. Effi ciency of working length detection and irrigation during preparation of curved root canals - Acta medica bulgarica , 39, 2012, No 1, 97-103.