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Epithelial remnants in the crestal periodontium of the deciduous and permanent dentition of beagle dogs
Author(s) -
Sterrett J. D.,
Berglundh T.,
Lindhe J.
Publication year - 1994
Publication title -
journal of clinical periodontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.456
H-Index - 151
eISSN - 1600-051X
pISSN - 0303-6979
DOI - 10.1111/j.1600-051x.1994.tb00754.x
Subject(s) - beagle , periodontal fiber , periodontium , deciduous dentition , dentistry , premolar , permanent dentition , deciduous , dentition , medicine , orthodontics , molar , biology , botany
. The purpose of this study was to document and characterize epithelial remnants (EPRs) of the crestal periodontium of the deciduous dentition of a diphyodont and compare them with EPR units found in the corresponding area of the permanent dentition. 7 beagle dogs were used. At the age of 10 weeks (deciduous dentition) and 15 months (permanent dentition), respectively, a 6‐week plaque control period was initiated. At the end of each plaque control period, biopsies were obtained from the mandibular 02 P, 03 P (deciduous dentition) and P 3 , P 4 (permanent dentition) premolar regions and prepared for histologic analysis. 2 regions, (1) the supracrestal region and (2) the periodontal ligament region, were identified. The supracrestal region was divided into 4 compartments of equal height. The histologic parameters studied included the (i) EPR frequency: number of EPRs/mm of root length, (ii) EPR size, (iii) EPR‐root distance, (iv) EPR‐bone distance and (v) cell area. No differences were observed between the 2 dentitions with respect to the number, size and relative location of EPR units in the supracrestal regions or the periodontal ligament regions. Epithelial remnants of the supracrestal region in both dentitions tended to be more frequent, larger and positioned further from the root surface than the EPRs of the periodontal ligament region. EPR units of the periodontal ligament region were located significantly further from the bone in the deciduous dentition than in the permanent dentition. The cell area of EPRs did not differ between the 2 dentitions. It was concluded that EPRs are a normal component of the crestal periodontal tissues of the deciduous dentitions of the diphyodont beagle dog and they appear to be similar to those found in the permanent dentition of young dogs.