中华口腔医学杂志
中華口腔醫學雜誌
중화구강의학잡지
Chinese Journal of Stomatology
2009年
5期
262-265
,共4页
聂敏%赵心臣%彭彬%樊明文%边专
聶敏%趙心臣%彭彬%樊明文%邊專
섭민%조심신%팽빈%번명문%변전
根管制备%牙科高速设备%牙髓腔
根管製備%牙科高速設備%牙髓腔
근관제비%아과고속설비%아수강
Root canal preparation%Dental high-speed equipment%Dental pulp cavity
目的 使用牙髓立体模型(Endodontic Cube)评价手用ProTaper预备不同弯曲根管的能力.方法 按纳入标准筛选离体牙样本,根据根管弯曲度(α)将根管分3组,A组0°≤α＜25°,B组25°≤α＜40°,C组40°≤α＜55°,每组18个根管.灌制Endodontic Cube模型,用低速锯将样本分为根管上、中、下段,组装模型,手用ProTaper预备根管,体视显微镜获取预备前、后根管的断面形态.统计学分析预备前后各段根管截面积之差AS、面积比、根管偏移距离X1、中心比CR值.结果 ①B、C组的牙本质切削量和预备前后根管截面积差比较大[B组根中部△S为(0.46±0.25)mm2,C组根中部△S为(0.48±0.30)mm2],显著大于A组[A组根中部AS为(0.28±0.13)mm2,P＜0.05];②C组的根管偏移距离最大,在根尖部[(0.23±0.10)mm]、根中部[(0.36±0.16)mm]及根上部[(0.31±0.15)mm]均显著大于A组[根尖部(0.19±0.07)mm、根中部(0.20±0.08)mm、根上部(0.18±0.08)mm,与C组相比P＜0.05],在根管中段的偏移距离显著大于B组[(0.28±0.11)mm,P＜0.05];③C组根管中部的维持能力显著差于A、B组(P＜0.01).结论 随着根管弯曲度的增加,手用ProTaper对牙本质的切削量增加,定位中心的能力降低.
目的 使用牙髓立體模型(Endodontic Cube)評價手用ProTaper預備不同彎麯根管的能力.方法 按納入標準篩選離體牙樣本,根據根管彎麯度(α)將根管分3組,A組0°≤α＜25°,B組25°≤α＜40°,C組40°≤α＜55°,每組18箇根管.灌製Endodontic Cube模型,用低速鋸將樣本分為根管上、中、下段,組裝模型,手用ProTaper預備根管,體視顯微鏡穫取預備前、後根管的斷麵形態.統計學分析預備前後各段根管截麵積之差AS、麵積比、根管偏移距離X1、中心比CR值.結果 ①B、C組的牙本質切削量和預備前後根管截麵積差比較大[B組根中部△S為(0.46±0.25)mm2,C組根中部△S為(0.48±0.30)mm2],顯著大于A組[A組根中部AS為(0.28±0.13)mm2,P＜0.05];②C組的根管偏移距離最大,在根尖部[(0.23±0.10)mm]、根中部[(0.36±0.16)mm]及根上部[(0.31±0.15)mm]均顯著大于A組[根尖部(0.19±0.07)mm、根中部(0.20±0.08)mm、根上部(0.18±0.08)mm,與C組相比P＜0.05],在根管中段的偏移距離顯著大于B組[(0.28±0.11)mm,P＜0.05];③C組根管中部的維持能力顯著差于A、B組(P＜0.01).結論 隨著根管彎麯度的增加,手用ProTaper對牙本質的切削量增加,定位中心的能力降低.
목적 사용아수입체모형(Endodontic Cube)평개수용ProTaper예비불동만곡근관적능력.방법 안납입표준사선리체아양본,근거근관만곡도(α)장근관분3조,A조0°≤α＜25°,B조25°≤α＜40°,C조40°≤α＜55°,매조18개근관.관제Endodontic Cube모형,용저속거장양본분위근관상、중、하단,조장모형,수용ProTaper예비근관,체시현미경획취예비전、후근관적단면형태.통계학분석예비전후각단근관절면적지차AS、면적비、근관편이거리X1、중심비CR치.결과 ①B、C조적아본질절삭량화예비전후근관절면적차비교대[B조근중부△S위(0.46±0.25)mm2,C조근중부△S위(0.48±0.30)mm2],현저대우A조[A조근중부AS위(0.28±0.13)mm2,P＜0.05];②C조적근관편이거리최대,재근첨부[(0.23±0.10)mm]、근중부[(0.36±0.16)mm]급근상부[(0.31±0.15)mm]균현저대우A조[근첨부(0.19±0.07)mm、근중부(0.20±0.08)mm、근상부(0.18±0.08)mm,여C조상비P＜0.05],재근관중단적편이거리현저대우B조[(0.28±0.11)mm,P＜0.05];③C조근관중부적유지능력현저차우A、B조(P＜0.01).결론 수착근관만곡도적증가,수용ProTaper대아본질적절삭량증가,정위중심적능력강저.
Objective To evaluate the shaping ability of hand-used ProTaper on curved canals using Endodontic Cube.Methods Fifty-four curved root canals in vitro were selected and dirided into three groups according to the Curved degree(α),group A:0°≤α＜25°,group B:25°≤α＜40°,group C:40°≤α＜55°.Endodontic Cube was assembled.and each sample was sectioned perpendicular to the axis of the tooth into four sections with Isomet-Buhler in low speed.Then the root canals were prepared with hand-used ProTaper.Before and after shaping,photograph of all the sections were taken under a stereomicroscope.Statistical analyses were performed.Results The dentin cutting quantity of the whole canal prepared with ProTaper in group B and C Was larger than that of group A.The deviation distance of the whole canal prepared by ProTaper in group C was significantly larger than that in group A,and the deviation distance in middle portion larger than that in group B.The maintaining ability in the middle portion ofgroup C by ProTaper wag worse than that of group A and B.Condusious The curvature of root canal mayincreasethe cutting quantity of the dentin and reduce the ability of remaining original canal shape prepared by ProTaper.
