Povezava med oblikovanostjo dentinsko-cementne meje in debelino cementa pri stalnih kočnikih = Relationship between the shape of the cementum-dentine junction and cementum thickness in permanent molars
Štamfelj, Iztok ...
Background: One of the key questions in dentistry is how to induce cementogenesis. Therefore the basic mechanisms of cementogenesis and, among them, the factors that determine cementum thickness need ...to be understood. Theobjective of the study was to investigate the possible relationship betweenthe shape of the cementum-dentine junction (CDJ) - the basis of the root relief - and cementum thickness. Material and methods: Images of transversely sectioned roots of 33 extracted mandibular and 33 maxillary permanent molars were captured using a stereomicroscope with an inbuilt videocamera. On root surfaces with a concave CDJ, image-analysis software was used to measure the depth of concavity of the CDJ (De CDJ) and the depth of the root concavity above it (De RC). Next, the difference was calculated between the measured depths (De CDJ-De RC), indicating the pattern of cementumthickness. The relationship between De CDJ and De CDJ-De RC was assessed using Pearson's correlation coefficient. Results: Thick cementum overCDJ concavity (De CDJ-De RC> O) was seen in 85.8% and 93.7% of the root surfaces of the mandibular and the maxillary molars, respectively. A statistically significant positive correlation between De CDJ and De CDJ-De RCwas established both for the mandibular and the maxillary molars (r = 0.303,P = 0.001 and r = 0.605, P < 0.001) Conclusions: The concavity of the CDJ can be regarded as a factor contributing to cementum thickness. The results obtained support the assumption that cementum thickness in the root concavity is determined during the early stage of tooth development on the boundary between the ectoderm and the ectomesenchyme, which is ultimately preserved as the CDJ of the completed root.
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