| Summary: | 碩士 === 長庚大學 === 顱顏口腔醫學研究所 === 92 === Abstract
The purpose of this study was to evaluate the space changes after premature loss of the maxillary first deciduous molar during the eruption of first permanent molar and use established model to investigate the long-term space changes after unilateral premature loss of the maxillary first deciduous molar. Nineteen children with unilateral premature loss of the maxillary first deciduous molar were selected from the children’s dental clinic for this study. The age ranged from 4.1 to 7.1 years with an average of 5.9 years. Maxillary study casts were made from alginate impression for each initial examination and follow-up examination six months later. Six measurements including D＋E space, arch width, arch length, arch perimeter, intercanine width and intercanine depth were tested for comparisons between the initial examination and the follow-up examination six months later. The D＋E space of intact deciduous molars served as a control. The results showed that the D＋E space on the extraction was significantly shorter in the group with the follow-up examination six months later as compared to that group with the initial examination (p<0.01). The arch length was significantly shorter in the group with the follow-up examination six months later as compared to that group with the initial examination the follow-up examination six months later (p<0.01). The intercanine width after the follow-up examination six months later was significantly wider than the initial examination (p<0.01). However, the absence of significant differences was found on arch width, arch perimeter and intercanine depth between the initial examination and the follow-up examination six months later (p>0.05). It is concluded that early space changes after premature loss of the maxillary first deciduous molar during the eruption of first permanent molar are mostly distal shift of the primary cuspid and maxillary permanent anterior incisors.
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