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Paper 4
Published in Amanda Rabone, Benedict Thomson, Nicky Dineen, Vincent Helyar, Aidan Shaw, The Final FRCR, 2020
Amanda Rabone, Benedict Thomson, Nicky Dineen, Vincent Helyar, Aidan Shaw
A 42 year old patient is referred for imaging by his GP with a painless lump on his jaw. A radiograph demonstrates a lucent lesion at the mandibular ramus. This has a multilocular honeycomb-like appearance. It is well defined and corticated. There is evidence of root resorption affecting the adjacent teeth. An MRI reveals a lesion containing cystic and soft tissue signal elements. There are no fluid-fluid levels. The septations and solid components enhance avidly following contrast injection.
Cysts and Tumours of the Bony Facial Skeleton
Published in John C Watkinson, Raymond W Clarke, Terry M Jones, Vinidh Paleri, Nicholas White, Tim Woolford, Head & Neck Surgery Plastic Surgery, 2018
Julia A. Woolgar, Gillian L. Hall
Formerly called ‘odontogenic keratocyst’, the KCOT65 was renamed at the WHO Consensus Conference, 2003,50 to reflect its neoplastic nature.66–68 It is now designated a benign, uni-/multicystic odontogenic tumour with potential aggressive, infiltrative behaviour.69 It is one of the most common odontogenic tumours, peaking in the 2nd and 3rd decades, with a M:F ratio of 1.6:1. Around 75% occur in the mandible, mainly in the molar-angle-ramus region. Many cases are asymptomatic presenting radiographically as a radiolucency, either small and round-ovoid, or larger with scalloped border (Figure 25.16). Large lesions may present with pain, swelling, discharge, pathological fracture and if cortical bone is penetrated, soft tissue involvement. Adjacent teeth may be displaced but root resorption is rare. The cyst lumen is full of creamy material—keratin squames—and the cyst wall is thin and lined by a thin, parakeratinized epithelium (Figure 25.17).
Dentoalveolar trauma
Published in John Dudley Langdon, Mohan Francis Patel, Robert Andrew Ord, Peter Brennan, Operative Oral and Maxillofacial Surgery, 2017
Similar injuries can occur in the primary dentition, some with differing treatment plans. The treatment plans are based on several factors. Aside from medical co-morbidities, treating a dentoalveolar injury may be based on the root resorption of the primary tooth and the potential injury of the developing permanent dentition. Traumatized primary teeth that are repositioned or remain in situ should be monitored until exfoliation for signs of pulpal necrosis.
Investigation of effective intrusion and extrusion force for maxillary canine using finite element analysis
Published in Computer Methods in Biomechanics and Biomedical Engineering, 2019
Jianlei Wu, Yunfeng Liu, Dongcai Wang, Jianxing Zhang, Xingtao Dong, Xianfeng Jiang, Xu Xu
The effective interval of canine intrusive force was enhanced almost twice as that observed in our previous study of 38–40 g (Wu et al. 2018); it was mainly because effective tensile stress and compressive stress ranges were not the same. The biomechanical responses of bone cells showing unequal sensitivity to tensile and compressive stresses were more convincing in orthodontics (Han et al. 2005). Illustratively, the effective intrusive force of 80–90 g was extremely close to the frequently used clinical orthodontic force of 100 g (Wahab et al. 2011). Moreover, according to Han et al. (2005), the percentage of root resorption was as low as 5.78 ± 3.86% when an objective tooth suffered an intrusive force of 100 g; this clinical study further corroborated the results of the current study.
Continued professional development
Published in Journal of Orthodontics, 2018
This case report describes the unusual incident of bilateral resorption of his maxillary first permanent molars by the unerupted second molars. Mild root resorption due to orthodontic treatment commonly causes the following: Loss of permanent teethExtreme discomfort due to mobilityRadiographic shortening of the rootsPulpal symptoms of affected teeth; orContinued root resorption once orthodontic treatment is complete
A retrospective study of traumatic dental injuries in primary dentition: treatment outcomes of splinting
Published in Acta Odontologica Scandinavica, 2018
Won Chang Cho, Ok Hyung Nam, Mi Sun Kim, Hyo-Seol Lee, Sung Chul Choi
In this study, pathological root resorption was the most common complication in the splint group. Pathological root resorption is a radiographic failure that can lead to early tooth extraction. There are many classifications and terms for different types of root resorption, such as inflammatory root resorption and replacement root resorption in permanent teeth [19]. However, current knowledge about the types of pathological root resorption in permanent teeth is not transferable to primary teeth [10]. For primary teeth, apart from pathological root resorption, the permanent successors may resorb the root of primary teeth, which, in terms of physiological root resorption and overlapping structures, may prevent an accurate diagnosis. Also, Rubel [20] claimed that digit sucking may be associated with atypical radicular resorption, even with no identified dental trauma. To diagnose pathological root resorption precisely, regular clinical and radiographic exams are needed, and this diagnosis becomes more accurate as more radiographic exams are performed [21]. However, even with the aid of radiographic exams, it is difficult to distinguish pathological root resorption from other root resorption types; thus, splinting cannot be deemed a major cause of root resorption in teeth with TDIs.