Prevalence of different types of accessory canals in the furcation area of third molars.

BACKGROUND Although there are several studies that show the prevalence and diameter of accessory root canals in the furcation area, there is a scarceness of studies that observe the trajectory and different types of cavo-interradicular canals. The aim of this study was to verify the prevalence of the different morphologic types of accessory canals in the furcation region in an attempt to show their trajectories. METHODS Forty submerged mandibular third molars were used, which were extracted and decalcified so that the microtomy procedure in the mesio-distal axial plane could be performed, obtaining semiserial sections with thicknesses of 5 microm. The sections were stained with hematoxylin and eosin and observed under optical microscopy. RESULTS All of the morphologic types were found, whereas the proper accessory canals, type-A canals, were present in 10% of the specimens. The most prevalent canals were the sealed ones (type D), with a prevalence of 87.5%, followed by the blind ones (type B), with a prevalence of 75%. The loop accessory canals (type C), observed in only 5% of the teeth, were the least prevalent ones. CONCLUSIONS Different morphologic types of accessory canals were found in the furcation area of submerged mandibular molars. The histologic method was effective to show the canal trajectories.

[1]  M. Witt,et al.  Scanning electron microscopic investigation of incidence, location, and size of accessory foramina in primary and permanent molars. , 2004, Quintessence international.

[2]  H. Issever,et al.  Incidence of patent furcal accessory canals in permanent molars of a Turkish population. , 2003, International endodontic journal.

[3]  P. Kramer,et al.  A SEM investigation of accessory foramina in the furcation areas of primary molars. , 2003, The Journal of clinical pediatric dentistry.

[4]  P. Luglie,et al.  [SEM study of morphologyc and incidence of accessory canals in the furcation region of permanent molars]. , 2001, Minerva stomatologica.

[5]  H. Meng.  Periodontic-endodontic lesions. , 1999, Annals of periodontology.

[6]  E. Hellwig,et al.  Microscopic studies of accessory canals in primary molar furcations. , 1997, ASDC journal of dentistry for children.

[7]  D. Pashley,et al.  An assessment of the ability of various materials to seal furcation canals in molar teeth. , 1996, Journal of endodontics.

[8]  S. Wearden,et al.  Dye ingress in molars: furcation to chamber floor. , 1993, Journal of endodontics.

[9]  T. Zullo,et al.  An investigation of accessory foramina in furcation areas of human primary molars: Part 1. SEM observations of frequency, size and location of accessory foramina in the internal and external furcation areas. , 1993, The Journal of clinical pediatric dentistry.

[10]  T. Zullo,et al.  An investigation of accessory canals in furcation areas of human primary molars: Part 2. Latex perfusion studies of the internal and external furcation areas to demonstrate accessory canals. , 1993, The Journal of clinical pediatric dentistry.

[11]  D. Pashley,et al.  In vitro permeability of furcation dentin in permanent teeth. , 1992, Journal of endodontics.

[12]  P. Defabianis,et al.  A SEM investigation on pulpal-periodontal connections in primary teeth. , 1992, ASDC journal of dentistry for children.

[13]  W. Seow,et al.  The prevalence of furcation foramina in primary molars. , 1989, Pediatric dentistry.

[14]  F. Vertucci,et al.  A scanning electron microscopic investigation of accessory foramina in the furcation and pulp chamber floor of molar teeth. , 1986, Oral surgery, oral medicine, and oral pathology.

[15]  R. Woo,et al.  Accessory canals in deciduous molars. , 1981, Journal of the International Association of Dentistry for Children.

[16]  A. Reader,et al.  A scanning electron microscopic investigation of accessory foramens on the pulpal floor of human molars. , 1981, Journal of endodontics.

[17]  B. G. Tidmarsh.  Micromorphology of pulp chambers in human molar teeth. , 1980, International endodontic journal.

[18]  J. Gutmann.  Prevalence, location, and patency of accessory canals in the furcation region of permanent molars. , 1978, Journal of periodontology.

[19]  B. Horizonte,et al.  Frequency, location, and direction of the lateral, secondary, and accessory canals. , 1975 .

[20]  J. Burch,et al.  A study of the presence of accessory foramina and the topography of molar furcations. , 1974, Oral surgery, oral medicine, and oral pathology.

[21]  G. B. Pelleu,et al.  Patent accessory canals: incidence in molar furcation region. , 1973, Oral surgery, oral medicine, and oral pathology.

[22]  Simpson Wj.  An examination of root canal anatomy of primary teeth. , 1973 .

[23]  V. K. Murray,et al.  Presence of accessory pulp canals. , 1973, Journal of the New Jersey Dental Association.

[24]  E. Goldsmith,et al.  HISTOLOGIC STUDY OF PULPAL FLOOR OF DECIDUOUS MOLARS. , 1965, Journal of the American Dental Association.

[25]  D. F. Mitchell,et al.  PERIODONTAL DISEASE, ACCESSORY CANALS AND PULP PATHOSIS. , 1965, The Journal of periodontology.

[26]  G. B. Winter.  Abscess formation in connexion with deciduous molar teeth. , 1962, Archives of oral biology.