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Related Study of the Correlativity Between Vertical Root Fracture and Root Canal Condensations

Author: GeBing
Tutor: WuYouNong
School: Nanjing Medical University
Course: Oral medicine
Keywords: Vertical root fracture System Evaluation Side pressure Vertical condensation Pressure fracture tests Fatigue test
CLC: R781.05
Type: Master's thesis
Year: 2009
Downloads: 51
Quote: 0
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Abstract

Vertical root fracture (vertical root fracture, VRF) occurred along the root long axis complete or incomplete fracture cracks throughout the full thickness of the root canal dentin to the periodontal ligament [1]. Diagnosis is difficult, Soraya [2] reported by X-ray diagnosis of 28 cases of root fracture line rate of 23%; conservative treatment, currently only a small number of case reports [3-6] successfully treated, clinical tooth still mainly . Visible to prevent the occurrence of root fracture is more important, in order to have a better understanding of root fracture etiology, diagnosis, pathogenesis, this paper discusses the following three parts. First systematic evaluation of vertical root fracture in English literature, summarizing vertical root fracture of the clinical features, diagnosis and treatment progress; followed by the analysis of X-ray findings and clinical cases of vertical root fracture cases; final obturation techniques The teeth of the mechanism of the resistance for a preliminary study. The first part of literature the system evaluation materials and methods according to the search strategy retrieved in English database included vertical root fracture study of literature from 1980 to 2008. Two evaluators carefully read the full text literature demonstrate strength according to the standards recommended by the Committee of Medical Journal Editors independent scoring, and cross-checked with third party re-evaluation of the disagreement with relevant expertise and 3 discuss according to the majority rule grading, final data for statistical analysis. Results (1) clinical literature into Chinese literature 45, 60 of the English literature. The evaluation results of the literature demonstrated strength: low argument strength \English 18); demonstrated strength in the \(2) basic research literature four Chinese, English 32. Conclusions The high-quality clinical research less, indicating that there is a greater degree of difficulty of the clinical trials from all aspects of design, implementation, statistical analysis; basic research on relatively weak Chinese. 1 X-ray of the second part of the clinical research preliminary analysis of materials and methods collected from 2005 to 2008, Jiangsu Provincial Stomatological Hospital clinical diagnosis and after tooth extraction confirmed the preoperative vertical root fracture teeth X-ray dental film 43, from tooth position, root apical shadow alveolar ridge defect diastema extent were retrospectively analyzed. 40 cases occurred in the posterior teeth; 25 cases occurred at the root of nearly mesiobuccal root; X-ray halo-like apical shadow performance 26 cases; alveolar ridge defect Jieyou 43 cases, 30 cases of which absorb serious; diastema Level: 31 cases Ⅳ degree root diastema, eight cases of Ⅲ degree root interhemispheric, four cases of Ⅱ degree root diastema. Conclusion vertical root fracture predilection teeth mesial root mesiobuccal root, are accompanied by alveolar defects, often accompanied by a halo-like apical shadow. Materials and methods of clinical case reports collected 2007.10 to 2008.10 Endodontics, Stomatology Hospital, Jiangsu Province, the clinical diagnosis of root fracture cases, record the patient's medical history, clinical examination, X-ray examination and retrospective analysis of their line. 5 patients age are 40 years old or more, occurred in the mandibular first molar, the main complaint of occlusal discomfort or pain, clinical examination occlusal surface wear 5 degrees, are associated with deep periodontal pockets, alveolar severe absorption, X-ray piece visible the interhemispheric line or dental flap shift are Unplug treatment. Conclusion vertical root fracture damage relates to the dental pulp, periodontal tissue, existing medical conditions to save the difficulties. Study of the third Ministry separation teeth - two filling method of root resistance 1 pressure destruction Materials and methods 45 extraction for orthodontic jaw premolars were randomly divided into three groups: the lateral pressure group, step-back technique to prepare root canal, cold gutta side pressure filling; vertical set of root canal preparation step-back technique, warm gutta vertical condensation filling; control group, no treatment. After filling along the cemento-enamel junction truncated crown, then made the standard specimen placed in a universal testing machine vertical static pressure to fracture to record the fractured instantaneous pressure value. Results fractured average instantaneous pressure: vertical group (378.25 ± 54.26) N, of lateral pressure groups (476.58 ± 73.03) N control group (724.82 ± 91.71) N t test showed significantly stronger than the vertical side of the pressure group resistance group (P <0.001), but low compared with that in the control group (P <0.001). Conclusion cold side pressure after filling teeth compression and strong warm vertical condensation. Step the thermal effect of the vertical filling may by injury dentin collagen fibers so that the root of the pressure drop resistance. Fatigue strength Materials and methods 80 conventional open myeloid vitro anterior mandibular molar root canal preparation were randomly divided into four groups: group 1, lateral condensation of cold gutta-percha filling, loading force of 50N (to simulate normal occlusion) ; Group 2, cold gutta side pressure filling, loading force of 75N (analog traumatic occlusion); Group 3, vertical compaction of warm gutta filling, loading force of 50N; Group 4, hot gutta vertical pressurized filling loading force of 75N. After filling along the cemento-enamel junction truncated crown, made into the specimen, the fatigue test system, improved the frequency 2Hz conditions under cyclic loading until fracture, record loading times, the results from the t-test. Average load number of group results to 16,433.25 ± 131.62, group 2, to 8,725.15 ± 138.06 in group 3 16,472.35 ± 110.48, set of 4 to 8,685.22 ± 91.82. Statistical analysis found that the number of load between different filling methods no difference (t13 = 0.32, t24 = 0.30). Conclusion The improved fatigue test system is used to simulate the chewing motion process is feasible. Bite force in a certain range of the cold side pressure filling and warm gutta gutta vertical filling root fatigue strength no difference.

Related Study of the Correlativity Between Vertical Root Fracture and Root Canal Condensations

Abstract

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