■研究的目的是提出并测试一种新的分级系统,以量化牙齿进入口腔的临床萌出。此外,该研究还旨在将分级系统应用于样本人群,以确定恒牙萌出的时间和顺序,将结果与现有标准表进行比较。
■设计了一项横断面研究,从钦奈的五所学校中选择了1220名5-18岁的儿童。使用新提出的系统对恒牙萌出的临床状态进行分级。使用Probit分析确定了恒牙萌出的顺序和时间,并将其与Logan和Kronfeld确定的顺序和时间进行了比较。使用ANOVA检验分析了两性之间喷发阶段的差异。
■研究样本包括515名男孩和705名女孩。总共对23,218颗上颌和下颌恒牙进行了检查和分级。在11,085颗上颌牙齿中,367人被归类为1级,660人被归类为2级,10,058人被归类为3级。同样,在12,133颗下颌牙齿中,497为1级,793为2级,10843为3级。上颌犬齿的萌出,第二磨牙,观察到下颌第二前磨牙比传统的牙齿萌出表更早发生。在9-12岁年龄组中,两性之间的喷发阶段差异最大。
■发现新提出的分级系统很简单,目标,不那么混乱,更健壮,与现有系统相比,在确定牙齿萌出的临床状态。上颌犬齿喷发的年龄,第二磨牙,下颌第二前磨牙更早。
UNASSIGNED: The objective of the study was to propose and test a new grading system to quantify the clinical eruption of teeth into the oral cavity. In addition, the study also aimed to apply the grading system to a sample population to determine the chronology and sequence of permanent tooth eruptions, comparing the results with an existing standard table.
UNASSIGNED: A cross-sectional study was designed, and 1220 children aged 5-18 years were selected from five schools in Chennai. The clinical status of permanent tooth eruption was graded using the newly proposed system. The sequence and chronology of permanent tooth eruptions were determined using Probit analysis and compared with those established by Logan and Kronfeld. The difference in stages of eruption between the sexes was analyzed using the ANOVA test.
UNASSIGNED: The study sample included 515 boys and 705 girls. A total of 23,218 permanent maxillary and mandibular teeth were examined and graded. Of the 11,085 maxillary teeth, 367 were classified as grade 1, 660 as grade 2, and 10,058 as grade 3. Similarly, of the 12,133 mandibular teeth, 497 were grade 1, 793 were grade 2, and 10,843 were grade 3. The eruption of the maxillary canines, second molars, and mandibular second premolars was observed to have occurred earlier than in the traditional table of tooth eruption. The most significant differences in the stages of eruption between the sexes were observed in the 9-12 age group.
UNASSIGNED: The newly proposed grading system was found to be simple, objective, less confusing, and more robust, compared with the existing systems in determining the clinical status of tooth eruptions. The ages of eruption of maxillary canines, second molars, and mandibular second premolars were earlier.