Pub Date : 2020-02-19DOI: 10.31487/j.dobcr.2020.01.06
B. Chen, Haijiang Liu, Ming-jiang Yi, Ming Wu, Xiao-ping Wang, Zhifeng Song
In endodontics, fracturing of the instrument in the root canal can arise as an inevitable problem for the dentist, especially during the application of the metal-nickel-titanium devices to the root canal. What is more, the broken parts of the instruments may be beyond the point of the apex, which can produce a range of symptoms and cause additional physical and mental pain to the patients that must be relieved as fast as possible. A few cases are available, in which the separated endodontic instruments beyond the apex are addressed with surgical approaches, indicating that some cases can be resolved by surgical management. However, it is difficult to achieve the ideal results often due to bleeding, a lack of clinic experience, and an inability to accurately comprehend soft tissue activities. The best way, then, is to prevent the occurrence entirely if possible.
{"title":"Instrument Separation Outside the Root Canal: Handling Methods and Difficulties","authors":"B. Chen, Haijiang Liu, Ming-jiang Yi, Ming Wu, Xiao-ping Wang, Zhifeng Song","doi":"10.31487/j.dobcr.2020.01.06","DOIUrl":"https://doi.org/10.31487/j.dobcr.2020.01.06","url":null,"abstract":"In endodontics, fracturing of the instrument in the root canal can arise as an inevitable problem for the\u0000dentist, especially during the application of the metal-nickel-titanium devices to the root canal. What is\u0000more, the broken parts of the instruments may be beyond the point of the apex, which can produce a range\u0000of symptoms and cause additional physical and mental pain to the patients that must be relieved as fast as\u0000possible. A few cases are available, in which the separated endodontic instruments beyond the apex are\u0000addressed with surgical approaches, indicating that some cases can be resolved by surgical management.\u0000However, it is difficult to achieve the ideal results often due to bleeding, a lack of clinic experience, and an\u0000inability to accurately comprehend soft tissue activities. The best way, then, is to prevent the occurrence\u0000entirely if possible.","PeriodicalId":72781,"journal":{"name":"Dental Oral Biology and Craniofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45584309","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-01-28DOI: 10.31487/j.dobcr.2020.01.01
C. Richardson, J. Choi, J. N. Waddell, Lin Zhou, Liza Yelyzaveta Tykhonova, Maykon Dias
Background and objectives: There has been a lack of studies regarding the marginal seal and structural durability of a novel temporary crown system (Hi-tempo) manufactured from a polylactic (PLA) based resin thermoplastic material especially in terms of cyclic loading. Therefore, the purpose of this pilot study was to investigate the efficiency of this novel temporary crown system’s (Hi-tempo) marginal seal and structural durability in terms of cyclic loading. Methods: A crown preparation was duplicated in bovine teeth (n =15) using a copy mill machine. The specimens were divided into three groups and temporary crowns were fabricated that consisted of: control group, Luxatemp (bis-acrylic), Hi-tempo crown, PLA based and Hi-tempo window type crown, PLA based with resin cusps. Marginal dimensional change was measured before and after cyclic loading with a 93.36 N force, 0.63 HZ, for 45360 cycles (stimulating 21 days in vivo) in water pigmented with a red dye. The marginal change was statistically analysed and the surface roughness was analysed using scanning electron microscopy (SEM). Results: Statistical significance (p<0.05) was found in the marginal changes of the control versus the Hitempo window and the Hi-tempo groups. SEM analysis revealed that the control crowns, had a much rougher surface with micro-cracks compared to PLA based crowns which had homogenous surfaces. All the specimens showed leakage of the red dye into the internal fitting surfaces of the crowns. Conclusions: The novel system showed promising and comparable results in terms of structural durability and marginal seal compared to the conventional system.
{"title":"The Efficacy of a Novel Temporary Crown System Marginal Seal and Structural Durability in Terms of Cyclic Loading - A Pilot Study","authors":"C. Richardson, J. Choi, J. N. Waddell, Lin Zhou, Liza Yelyzaveta Tykhonova, Maykon Dias","doi":"10.31487/j.dobcr.2020.01.01","DOIUrl":"https://doi.org/10.31487/j.dobcr.2020.01.01","url":null,"abstract":"Background and objectives: There has been a lack of studies regarding the marginal seal and structural\u0000durability of a novel temporary crown system (Hi-tempo) manufactured from a polylactic (PLA) based resin\u0000thermoplastic material especially in terms of cyclic loading. Therefore, the purpose of this pilot study was\u0000to investigate the efficiency of this novel temporary crown system’s (Hi-tempo) marginal seal and structural\u0000durability in terms of cyclic loading.\u0000Methods: A crown preparation was duplicated in bovine teeth (n =15) using a copy mill machine. The\u0000specimens were divided into three groups and temporary crowns were fabricated that consisted of: control\u0000group, Luxatemp (bis-acrylic), Hi-tempo crown, PLA based and Hi-tempo window type crown, PLA based\u0000with resin cusps. Marginal dimensional change was measured before and after cyclic loading with a 93.36\u0000N force, 0.63 HZ, for 45360 cycles (stimulating 21 days in vivo) in water pigmented with a red dye. The\u0000marginal change was statistically analysed and the surface roughness was analysed using scanning electron\u0000microscopy (SEM).\u0000Results: Statistical significance (p<0.05) was found in the marginal changes of the control versus the Hitempo window and the Hi-tempo groups. SEM analysis revealed that the control crowns, had a much\u0000rougher surface with micro-cracks compared to PLA based crowns which had homogenous surfaces. All\u0000the specimens showed leakage of the red dye into the internal fitting surfaces of the crowns.\u0000Conclusions: The novel system showed promising and comparable results in terms of structural durability\u0000and marginal seal compared to the conventional system.","PeriodicalId":72781,"journal":{"name":"Dental Oral Biology and Craniofacial Research","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46734242","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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