UWA Dental School, The University of Western Australia, Nedlands, WA, Australia.
Int J Paediatr Dent. 2018 May;28(3):310-318. doi: 10.1111/ipd.12356. Epub 2018 Mar 2.
To investigate the root canal morphology of hypomineralised second primary molars(HSPM) using micro-CT(μCT) compared with non-hypomineralised second primary molars (non-HSPM).
Ten HSPM and 10 non-HSPM were divided into Group 1(maxillary HSPM), Group 2 (mandibular HSPM), Group 3(maxillary non-HSPM), and Group 4 (mandibular non-HSPM). All teeth were scanned using μCT to assess the following parameters: (i) root canal configuration, (ii) pulp volumes, and (iii) the influence of the root canal system landmarks on access cavity outline forms and canal curvature. Two-way ANOVA was employed for descriptive analysis (P < 0.05).
At the furcation level, there was minimal variation in the number of canals. In the mesiobuccal root, Group 1 showed higher frequency of multiple canals in the middle (85.7%) and apical (85.7%) thirds compared with Group 3. In the mesial root, Group 4 demonstrated multiple canals at the furcation (60%) compared with Group 2(33.3%). In the distal root, Group 2 demonstrated a higher percentage of multiple canals at the apical level (100%) compared with Group 4. The mean pulp volumes of Group 2 and Group 4 were 54.1 mm (16.7) and 30 mm (5.12), respectively, which was statistically significant (P < 0.05). The canal curvature values did not differ significantly between HSPM and non-HSPM groups.
HSPM exhibited greater variations in their root canal configuration when compared to non-HSPM.
通过 micro-CT（μCT）比较研究低矿化第二恒磨牙（HSPM）与非低矿化第二恒磨牙（non-HSPM）的根管形态。
将 10 颗 HSPM 和 10 颗非-HSPM 分为上颌 HSPM（Group 1）、下颌 HSPM（Group 2）、上颌非-HSPM（Group 3）和下颌非-HSPM（Group 4）。所有牙齿均采用μCT 扫描，评估以下参数：（i）根管形态，（ii）牙髓体积，以及（iii）根管系统标志对入口腔轮廓形态和根管弯曲度的影响。采用双因素方差分析进行描述性分析（P<0.05）。
在分叉水平，根管数量变化极小。在近中颊根中，Group 1 中近中和根尖 3 分之三出现多根管的频率更高（85.7%），而 Group 3 则为 85.7%。在近中根中，Group 4 在分叉处显示出更多的多根管（60%），而 Group 2 为 33.3%。在远中根中，Group 2 在根尖水平出现多根管的比例更高（100%），而 Group 4 则为 54.1mm（16.7）和 30mm（5.12），差异具有统计学意义（P<0.05）。远中根中，Group 2 出现多根管的比例更高（100%），而 Group 4 则为 54.1mm（16.7）和 30mm（5.12），差异具有统计学意义（P<0.05）。远中根中，Group 2 出现多根管的比例更高（100%），而 Group 4 则为 54.1mm（16.7）和 30mm（5.12），差异具有统计学意义（P<0.05）。HSPM 的根管弯曲度值与 non-HSPM 组无显著差异。
与 non-HSPM 相比，HSPM 的根管形态有更大的差异。
