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Biomedical subjects

W W Xia

Publications and source records attributed to W W Xia.

6 recordsLinked to original sources
PubMed2001

[Establishing a FEM of mandibular first molar and stress analysis].

OBJECTIVE: Establishing a finite element model of mandibular first molar with analysis of the stress distribution to each of the tooth parts on the model. METHODS: The right mandibular first molar in vitro was scanned and the image was processed. The three dimensional finite-element model was established by the special software and loaded on it. RESULTS: Stress distribution on each part of the tooth was obtained. The maximum values of compressive stress, tensile stress and mises stress were calculated. CONCLUSION: In the research and analysis of the tooth stress, the finite element method is simple, effective, safe and reliable.

English Abstract↗
PubMed1998

[Assessment accuracy of electronic root canal length measurement]

OBJECTIVE: To see the accuracy of "ROOT ZX" electronic root canal measurement in clinical endodontic practice. METHODS: Root canal length of 176 anterior teeth were measured by "ROOT ZX",after radiographs were taken,the distance between reamer tip and toot apex was measured,and then compared it with the distance between apical foramen and root apex of extracted teeth. RESULTS: Statistical analysis indicated no significant difference between two groups. CONCLUSION: It shows: that the electronic device can measure the root canal length accurately.It is believed that it has a higher value in clinical endodontic practice.

Journal Article↗
PubMed1998

[Effect on preparing curved artificial root canal with five handle endodontic instruments II comparision of shaping ability]

OBJECTIVE:To compared the shaping ability of five handle endodontic instruments. METHODS: The canal shape of prepared artificial root canals with five handle endodontic instruments were observed by light-microscope. RESULTS: Apical zips,elbows and perforations were not found. Ledges occurred in speciments of K-Flex group and they were relating to resinous plugs.The apical transportatins were relating to resinous plugs.The apical transportations of K-Flex group and H file group are much greater than other groups. CONCLUSION: Unifile or K file is first choice to prepare curved artificial root canals with routine preparation technique by comprehensive evaluaion of the cutting ability and shaping ability of five handle endodontic instruments.

Journal Article↗
PubMed1998

[A comparative study on preparation techniques for fine curved canal of posterior teeth]

A comparison of canal shape produced by routine preparation technique,ultrasonic technique and step-back technique for fine curved canal of posterior teeth was done in this article.The result showed that the canal shape prepared with step-back technique was better,for its postoperative angle change and apical transportation were less than the other two groups.On the contrary,the canal shape prepared with routine technique was worst.Therefore it was concluded that the step-back technique was the first choice for preparing the fine curved canal of posterior teeth.Routine technique was not suitable to prepare the fine curved canal of posterior teeth.

Journal Article↗
PubMed1998

[A comparative study of apical sealing ability on filling techniques for curved canal of posterior teeth]

A comparison of apical leakage produced by three preparation technique and two obrutation methods was done in this article.The fine curved canals were prepared with routine prepartion technique,ultrasonic technique,step-back technique and filled with traditional lateral condensation,warm gutta-percha lateral condensation separately.The result showed that the apical sealing ability of warm gutta-percha lateral condensation was superior to traditional lateral condensation.It could remedy the defect of irregular canal shape of fine curved canal preapred with routine technique and ultrasonic technique in some degree by the improvement of apical sealing ability.

Journal Article↗