Vertucci F J, Gegauff A
J Am Dent Assoc. 1979 Aug;99(2):194-8. doi: 10.14219/jada.archive.1979.0255.
Four hundred maxillary first premolars were decalcified, injected with dye, cleared, and studied. The canal configurations were categorized as: 26% had one canal, 69% had two canals, and 5% had three canals at the apex. The relationship of canal configuration to number of roots per tooth was determined. Of the canals studied, 49.5% had lateral canals. They occured equally in all types of canals, were located mainly in the apical region, and exited from the main canal mostly in a palatal direction. Also, 11% of these canals extended from the floor of the pulp chamber to the furcation area. An accurate knowledge of the morphology of the pulp cavity is essential before endodontic procedure can be approached rationally. The frequency with which root canals unite should be considered during enlargement and filing procedures. The dentist also should be aware of the possible existence of bifurcated and double canals if root canal therapy should unexplainbly fail. A knowledge of these variations will assist the dentist in reaching conclusions when diagnosing and treating endodontic cases.
对400颗上颌第一前磨牙进行脱钙、注射染料、透明处理并进行研究。根管形态分类如下：根尖处有1个根管的占26%，有2个根管的占69%，有3个根管的占5%。确定了根管形态与每颗牙齿根数的关系。在所研究的根管中，49.5%有侧支根管。它们在所有类型的根管中出现的频率相同，主要位于根尖区域，大多从主根管腭侧穿出。此外，这些根管中有11%从髓室底延伸至根分叉区。在合理进行牙髓治疗之前，准确了解髓腔形态至关重要。在根管扩大和锉削过程中应考虑根管合并的频率。如果根管治疗出现无法解释的失败，牙医还应意识到可能存在分叉根管和双根管。了解这些变异情况将有助于牙医在诊断和治疗牙髓病病例时得出结论。
