The purpose of this study was to relate the proportions of bone-supported root length of a 2D view into the amount of a 3D bone-Attached root surface area (BA-RSA) by using a dental laser scanner examination. White-light 3D scanning technology was used to probe 36 maxillary and 35 mandibular single-rooted premolars. The bone-supported height (BSH) and BA-RSA at designated levels (95-25%) were compared using statistical t tests. The 100% BSH and BA-RSA of the maxillary/mandibular premolars were 12.6 ± 1.60 mm/13.45 ± 1.47 mm (p < 0.05) and 220.78 ± 35.31 mm 2 /199.51 ± 26.33 mm 2 (p < 0.01), respectively. Approximately 79-80%, 59-60%, and 35-36% premolars 2D BSH remained in comparison to 75%, 50%, and 25% 3D BA-RSA preservation, respectively. However, corresponding to a 75%, 50%, and 25% 2D BSH reserve, premolars retained 67-68%, 39-41%, and 15-17% 3D BA-RSA, respectively. When taking 1.0 mm connective tissue attachment into account, 60% 3D BA-RSA and 50% 2D BSH loss were noted at the 5.1-5.4 mm clinical attachment level. Assigning a periodontal prognosis and determining the severity of periodontitis for premolars with alveolar bone loss based on 3D's or 2D's measurement is inconsistent.
ASJC Scopus subject areas
Hong, H. H., Chang, C. C., Hong, A., Liu, H. L., Wang, Y. L., Chang, S. H., & Yen, T. H. (2017). Decreased Amount of Supporting Alveolar Bone at Single-Rooted Premolars Is under Estimated by 2D Examinations. Scientific Reports, 8, . https://doi.org/10.1038/srep45774