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The relation of the maxillary central incisor, nasal bone, anterior cranial base lengths and the body height in different skeletal patterns

Authors: Nidhal H.Ghaib --- Hussein A. A. M. Al-Najar
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: 1 Pages: 112-115
Publisher: Baghdad University جامعة بغداد


Background: The reason for measuring the frontonasal field which include the length of the anterior cranial base , the
nasal bone, and the incisors is that all these structures deviate from normal structures in patients with malformations
of the frontonasal field.
Materials and Methods: Maxillary central incisor, nasal bone and anterior cranial base lengths were measured by
cephalometric analysis of 122 lateral cephalometric radiographs using autocad 2008 program, also body height was
assessed by height measuring standard for adult patients with different skeletal patterns, including CLI (n= 48), CLII
(n= 45), CLIII (n= 29), normal MP-SN angle (n= 70), low angle (n= 28) and high angle (n= 24) .
Results and Conclusion: The maxillary central incisor was longer in high angle males group c. Short nasal bone was
found in CLII males and females and in low angle males group. Longer anterior cranial base was found in low angle
males, while the anterior cranial base was shorter in high angle males.
Key words: Cephalometrics, Maxillary central incisor, Nasal bone, anterior cranial base, Body height. (J Bagh Coll
Dentistry 2011;23(1):112-115).


Evaluation of enamel surface damage after debonding using three different pliers "An in vitro study"


AbstractThis study aims to compare the effectiveness of three different pliers in debondingstainless steel and ceramic brackets, also to evaluate enamel surface damage and thesite of bond failure after debonding.Sixty premolars, extracted for orthodontic purposes, were divided into 3 groups of20. The enamel surfaces were examined with 10X magnifying lens. Two types ofbracket (stainless steel and ceramic) was bonded and debonded in each group using:conventional debonding pliers, bracket removal pliers, and ligature wire cutter. Afterdebonding, the enamel surfaces were inspected under a stereomicroscope to determinethe predominant site of bond failure. Then stereomicroscope was used to evaluateenamel surface damage after the removal of residual adhesive.The enamel surface damage showed a statistically significant difference in ceramicbracket groups, whereas, it was statistically insignificant in stainless steel bracketgroups. The amount of the adhesive remained on the tooth surface was statisticallyinsignificant in both stainless steel and ceramic bracket groups. The predominantfailure site was within the adhesive itself for both types of brackets.The enamel surface damage that results from debonding of ceramic brackets washigher than that found with the stainless steel brackets especially with the use ofbracket removal pliers "used in this study"

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