ABSTRACT
Introduction: Dental trauma is an irreversible pathologyand it is a commonly encountered problem in school childrenwhich after occurrence is characterized by lifelong debilitatingeffects because of physical, psychological discomfort andpain. Thus a study was conducted to assess the prevalence ofthe traumatic dental injuries to the permanent anterior teeth inrelation to occlusal relationship among 7-14 years old schoolchildren in Chitradurga townMaterial and Methods: Descriptive cross sectional studywas conducted among 3,363, 7-14 years old school childrenof Chitradurga Town. WHO (ICD-DA) 1995 Classificationwas used for assessing traumatic dental injuries and Angle’sclassification with Dewey’s Modification was used forrecording occlusal relationship. Fifteen Primary and HigherPrimary Schools and Five High schools were selected usingsimple random sampling procedure. Children aged 7-14 yearswere included in the study. Data was recorded using speciallydesigned proforma. The collected data was subjected tostatistical analysis.Results: Among 3,363 children examined prevalence rate was5.5% with higher prevalence in boys than girls. Prevalenceof traumatic dental injuries was more in the age group of10-12 years. Traumatic injuries of permanent anterior teethinvolved both maxillary and mandibular teeth with the higherprevalence in Maxillary anterior’s. Enamel fracture was thehighest (87.8%). Children with Class I type 2 and class IIdivision 1 occlusal relation exhibited very highly significantnumber of dental injuries.Conclusion: Prevalence of traumatic dental injuries wasmore in the age group of 10-12 years. Children with ClassI and class II division 1 occlusal relation exhibited veryhighly significant number of dental injuries than other type ofocclusal relationship
ABSTRACT
Objective To explore the application effects of segmental design principles in the small incision approach rigid internal fixation for the treatment of maxillofacial fractures.Methods With a retrospective study,from September 2012 to April 2016,172 patients with maxillofacial fractures were selected as the research object in our hospital.All the patients were divided into the observation group of 100 patients and control group of patients according to the different treatment methods.Two groups were treated with mall incision approach rigid internal fixation.The observation group were given the preoperative design based on the segmental design principles.The other operation process were similar with the control group.Results All patients were completed the operation,the fracture were healed by Ⅰ stage.The postoperative 3months of total effective rates of the observation group and the control group were 98.0％ and 83.3％.The total effective rate of the observation group was significantly higher than that of the control group (P ＜ 0.05).The postoperative 3months of infection,nerve injury,salivary fistula,screw loosening and complication rate in the observation group was 3.0％,so that was 20.8％ in the control group,the observation group was significantly lower than the control group (P ＜ 0.05).The postoperative 3months of occlusal relationship and normal rates of the observation group were 99.0％ and 98.0％,respectively.The control group was 93.1％and 90.3％,respectively.There were between the two groups statistically significance difference(P ＜ 0.05).Conclusion The segmental design principles in the small incision approach rigid internal fixation for the treatment of maxillofacial fractures can improve the therapeutic effect,reduce the incidence of postoperative complications,improve the occlusal relationship with normal mouth opening rate.It is an ideal method for the treatment of maxillofacial fracture.
ABSTRACT
Objective To provide references for the clinical treatment of patients with periodontal diseases by modeling and analysis based on four software and obtaining stress distributions of the patient’s teeth, according to CT data and plaster model of the patient’s teeth. Methods The CT data were preliminary processed by using Mimics software to establish three-dimensional (3D) cloud model. The 3D surface model of the teeth was then constructed by using Geomagic software to make parameter modeling and reverse engineering. The 3D surface model was imported into SolidWorks to obtain the 3D entity model by entity conversions. Finally, the 3D entity model was imported to ANSYS for analysis. Results The stress distributions on the upper teeth were obtained, and the location of stress concentration points was determined. The stress concentration points of the teeth were analyzed separately, and the maximum stress was 1 774.8 MPa. The occlusal relationship was adjusted based on stress distributions, and the maximum stress after adjustment was reduced to 1 529 MPa. Conclusions This dental modeling and analysis method can simulate various occlusal relationships and calculate tooth stress distribution after amendment, which provides the theoretical basis for clinical treatment of periodontal diseases.
ABSTRACT
Objective To provide references for the clinical treatment of patients with periodontal diseases by modeling and analysis based on four software and obtaining stress distributions of the patient's teeth,according to CT data and plaster model of the patient's teeth.Methods The CT data were preliminary processed by using Mimics software to establish three-dimensional (3 D) cloud model.The 3 D surface model of the teeth was then constructed by using Geomagic software to make parameter modeling and reverse engineering.The 3D surface model was imported into SolidWorks to obtain the 3D entity model by entity conversions.Finally,the 3D entity model was imported to ANSYS for analysis.Results The stress distributions on the upper teeth were obtained,and the location of stress concentration points was determined.The stress concentration points of the teeth were analyzed separately,and the maximum stress was 1 774.8 MPa.The occlusal relationship was adjusted based on stress distributions,and the maximum stress after adjustment was reduced to 1 529 MPa.Conclusions This dental modeling and analysis method can simulate various occlusal relationships and calculate tooth stress distribution after amendment,which provides the theoretical basis for clinical treatment of periodontal diseases.