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臼齒根叉形態與局部牙周炎之關係(II)根叉入口角度及頸部高度之分析

Analysis of Divergent Angle and Length of CEJ to Furcation Entrance in Extracted Molars

摘要


以Bioscan OPTIMAS影像分析儀,測量國人第一及第二大臼齒的牙根分叉入口角度,牙骨質牙釉質交界(cemento-enamel junction;CEJ)至牙根分叉入口處(furcation entrance;FE)的距離;此外也探討根叉病灶區和牙菌斑控制的難易程度之關係及所使用牙周器械寬度的清潔死角。總數182顆的大臼齒樣本中,第一大臼齒99顆,上顎49顆,下顎50顆;第二大臼齒83顆,上顎40顆;下顎43顆。將這些樣本放在立體顯微鏡下,放大2.5倍,再取像至Bioscan OPTIMAS 影像分析儀中加以測量。結果發現: ( 1)牙根分叉入口角度的平均值:上顎第一大臼齒的頰面、近心面與遠心面之平均根叉角度分別是96.31±10.00 ; 103.82±9.74 ; 107.19±12.16。下顎第一大臼齒的頰面與舌面平均根叉角度分別是100.50±9.68 ; 102.72±8.54。上顎第二大臼齒的頰面、近心面與遠心面之平均根叉角度分別是91.56±11.72 ; 101.65±11.45 ; 97.11±10.71。下顎第二大臼齒的頰面與舌面平均根叉角度分別是93.32±11.51 ; 91.72±10.77。(2 ) CEJ 至牙根分叉入口處的距離平均值:上顎第一大臼齒的頰面,近心面及遠心面的平均值分別是3.42±l.05mm;3.55±0.97mm及3.69±0.98mm。下顎第一大臼齒的頰面及舌面的平均值分別是1.90±0.80mm與2.90±0.70mm。上顎第二大臼齒的頰面,近心面及遠心面的平均值分別是3.01±l.04mm ; 4.04±1.58mm;和3.00±1.14mm。下顎第二大臼齒的頰面及舌面的平均值分別是2.82±l.34mm和3.46±1.03mm。結論顯示上顎第二大臼齒之頰面根叉入口角最小;最不利plaque control;下顎頰面之CEJ至FE最近,( 1.9mm及2.82mm)最易簽生根叉病灶。

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並列摘要


The purposes of this study were to investigate the furcation entrance angle (FEA) and the distance between cemento-enamel junction (CEJ) and furcation entrance (FE) of the extracted maxillary and mandibular molars. Assay teeth comprised 89 maxillary molars and 93 mandibular molars. All the FEAs and CEJ-FEs of the molars were measured by a stereomicroscope at 2.5 x equipped with a Bioscan OPTIMAS Image Analyzer (BOIA). The results were summarized as follows: (1) The mean FEAs in the buccal, mesial and distal furcations were 96.3 ± 10.0, 103.8 ± 9.7, and 107.2 ± 12.2 degree in the maxillary molars, and 91.6 ± 11.7, 101.7 ± 11.5, and 97.1 ± 10.7 degree in the maxillary second molars, respectively. At the buccal and lingual furcations of mandibular first and second molars, they measured 100.5 ± 9.7/102.7 ± 8.5, and 93.3 ± 11.5/91.7 ± 10.8 degree, respectively. (2) The mean distance of CEJ-FEs at the buccal, mesial and distal furcations of maxillary molars were 3.42 ± 1.5mm, 3.55 ± 0.97mm, and 3.69 ± 0.98mm for the first molars, and 3.01 ± 1.04mm, 4.04 ± 1.58mm and 3.00 ± 1.14mm for the second molars. At the buccal and lingual furcations of the mandibular first and second molars, they were recorded as 1.90 ± 0.08mm and 2.90 ± 0.07mm, and 2.82 ± 1.34mm and 3.46 ± 1.03mm, respectively. It was concluded that buccal FEA of maxillary 2nd molar was the smallest (91.56 ± 9.68 degrees) as compared to the mesial and distal FEAs; whereas the mean distance of CEJ-FEs at the buccal surface was the smallest (l.90mm ± 0.08mm) when compared to the others.

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