跳至主要内容

Prevalence of Impacted Maxillary Canines in a Palestinian Population

An impacted tooth means that it is stuck and cannot erupt into function. And the maxillary cuspid, namely maxillary canine, is the second most common tooth to become impacted. Actually, there are four canines: two maxillary canines and two mandibular canines and the canines are critical teeth in the dental arch and play an important role to the dentofacial aesthetics and function.

Considering the importance of canines and due to the impacted maxillary canines is a frequently encountered clinical problem, many studies evaluated the prevalence of impacted canines among various populations and reported vast differences in their findings.

In this paper, a retrospective, descriptive, cross-sectional study of 1321 digital panoramic radiographs was conducted and the authors aimed to estimate the prevalence of impacted maxillary canines in the general population of the city of Nablus, Palestine. The radiographs were obtained from the records of a private dental clinic from the year 2009 till 2016 and were examined by two experienced examiners in order to detect impacted maxillary canines. Then collected data were processed and analyzed by using IBM SPSS Statistics V. 22. Besides, the authors used chi square test to reveal differences in the distribution of impacted canines when stratified by gender, location (left or right), and being unilateral or bilateral.

And the findings showed that the prevalence of impacted canines among the examined population (n = 1321) was found to be 1.8%. There was a significant association between gender and canine impaction (P < 0.05), indicating females had higher prevalence of canine impaction than males. The results also revealed significantly higher unilateral canine impaction compared to bilateral impaction. While, no significant difference in the prevalence of right or left canine impaction was found.

In conclusion, the prevalence of impacted maxillary canines (1.8%) in this study was within the range reported among other populations. And future studies are needed to evaluate the etiology of teeth impaction in Palestine.

Article by Naji Arandi, et al, from Palestine.

Full access: http://mrw.so/s0C74  
Image by Iso Bellies, from Flickr-cc.



评论

发表评论

此博客中的热门博文

Electron Spin and Proton Spin in the Hydrogen and Hydrogen-Like Atomic Systems

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52202#.VIj7tMnQrzE Author(s) Stanisław Olszewski * Affiliation(s) Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland . ABSTRACT The mechanical angular momentum and magnetic moment of the electron and proton spin have been calculated semiclassically with the aid of the uncertainty principle for energy and time. The spin effects of both kinds of the elementary particles can be expressed in terms of similar formulae. The quantization of the spin motion has been done on the basis of the old quantum theory. It gives a quantum number n = 1/2 as the index of the spin state acceptable for both the electron and proton ...
发表评论
阅读全文

Incorporation of High-Altitude Balloon Experiment in High School Science Classrooms

High-altitude balloon is a balloon, filled usually with helium or hydrogen that ascends into an area called “near space” or stratosphere. The most common type of high-altitude balloons are weather balloons. Other purposes include use as a platform for experiments in the upper atmosphere. Modern balloons generally contain electronic equipment such as radio transmitters, cameras, or satellite navigation systems, such as GPS receivers. The mission of the High-Altitude Balloon Experiment (HABE) is to acquire supporting data, validate enabling technologies, and resolve critical acquisition, tracking, and pointing (ATP) and fire control issues in support of future space-based precision pointing experiments. The use of high-altitude balloons offers a relatively low-cost, low-vibration test platform, a recoverable and reusable payload, worldwide launch capability, and a 'near- space' emulation of the future space systems operational scenarios. More recently, several university...
1 条评论
阅读全文

Remarks on the Complexity of Signed k-Domination on Graphs

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53574#.VMnXsCzQrzE Author(s)    Chuan-Min Lee 1 , Cheng-Chien Lo 1 , Rui-Xin Ye 2 , Xun Xu 2 , Xiao-Han Shi 2 , Jia-Ying Li 2 Affiliation(s) 1 Department of Computer and Communication Engineering, Ming Chuan University, The First American University in Asia, Taoyuan, Taiwan, Chinese Taipei . 2 Department of Electronic Information Engineering, Fuzhou University, Fuzhou, China . ABSTRACT This paper is motivated by the concept of the signed k-domination problem and dedicated to the complexity of the problem on graphs. For any fixed nonnegative integer k, we show that the signed k-domination problem is NP-complete for doubly chordal graphs. For strongly chordal graphs and distance-hereditary graphs, we show that the signed k-domination problem can be solved in polynomial time. We also show that the problem is linear-time solvable for trees, interval graphs, and chord...
发表评论
阅读全文