Comparison Of Clinical Application Of Two Kinds Of Eruption Blocking Appliance

Objective:By observing the condition of gap maintenance,early germination of permanent teeth and remaining other tooth periodontal health status in children with blocking appliance,this study analyzed and disscused the clinical feature and effects of the tow kinds of eruption blocking device,so that providing some data for selection of eruption blocking device.Methods:1.According to the inclusion criteria,this study selected 60 patients with 60 first primary molar teeth that could not be preserved or had been removed for one week in the Department of Hospital of Stomatology,Shanxi Medical University,and then they were randomly divided into a base plate blocking device and steel wire blocking device group.2.making a mode after tooth extraction one week,Measuring the size of the gap,and the sending it to the processing plant to make the blocking device,then the same doctor wear it in the mouth within one week.Clinical observation of inherited permanent teeth eruption before and after wearing for 1,3,6,9 and 12 months;at the same time,the annular abutment teeth,primary canine and contralateral deciduous canine,first and second deciduous molar teeth were measured,and measuring index was Plaque Index,Gingival Index,the annular abutment teeth and contralateral second deciduous molar teeth’s Probing Depth;At the same time,the X-ray were taken at 3,9 and 12 months to observe the eruption height and root development of permanent teeth.If the root develops to one-half or more,the blocking device can be removed;The number of shedding times of the two groups of blocking device was recorded during the entire observation period.3.Collated data and statistical,analysed of the results of the two groups.Results:1.There was no significant difference in gender between the two groups(P>0.05)2.There was no statistical difference between the two groups in the absence of the first deciduous molars position(P>0.05).3.The effect of the blocking device(1)Clinical examination inherits the eruption of permanent teeth:In the steel wire group,20 cases of inherited permanent teeth in Level 2 were observed at 12 months,and they were in close contacted with the silk;No permanent teeth were found in the mouth of the base group.(2)The location of the permanent teeth on the X-ray apical slice: visited to the two groups of children 3 months after,the eruption height in all cases were significantly increased than pre-wear,and most have risen to near-resistance.9,12-month review showed less change in the position of the permanent teeth at the time of the 3 months.4.The effect of wearing the blocking device on the periodontal(1)There was no significant difference between the affected side and the healthy side of the two groups before wearing the eruption blocking device(P>0.05),and there was no significant difference between the base group and steel wire group(P>0.05).(2)The PLI,GI and PD on the affected side of the two groups were higher than those healthy side after wearing the eruption blocking device,the difference was statistically significant(P<0.05).(3)At 1 month after wearing the blocking device,the plaque index in the base plate group was significantly higher than that in the steel wire group(P<0.05),while there was no significant difference in gingival index and probing depth(P>0.05).(4)At 3 months,6 months,9 months and 12 months,the plaque index,gingival index and probing depth of the base plate grop were significantly higher than those of the steel wire group,the difference was statistically significant(P<0.05).5.During the one-year observation,there were 4 cases of shedding in the base plate group and 11 cases in the steel wire group.The shedding of the two groups was statistically significant(P<0.05).Conclusion:1.The two types of blocking device both effectively prevent premature eruption of the inherited permanent to establish occlusion relationship with the occlusion.However,the resistance effect of the basal eruption blocking is better than that of the wire to some extent.2.The wearing of the blocking device will have a certain influence on oral health,The effect of the base plate-type is greater than that of the steel wire-type blocking device on the periodontal status and oral hygiene.Therefore,it is recommended that children with poor oral hygiene should be careful to use the basal resistance device.3.The base plate type is better than the steel wire type blocking device and has better stability.Therefore,when the abutment teeth with a ring are poorly retention,it is recommended to choose a base plate blocking device.