[Current situation and strategy on perforation repair].

Perforations are common complications of root canal therapy. In clinic, perforations that were improperly and untimely repaired can seriously affect the prognosis of teeth after root canal treatment. At present, the status of perforation repair in our country is worrisome.

[Cytotoxicity evaluation of three kinds of perforation repair materials on human periodontal ligament fibroblasts in vitro].

Objective: To select three kinds of perforation repair materials, mineral trioxide aggregate (MTA), Z350, amalgam. And to evaluate the cytotoxicity of three kinds of perforation repair materials on human periodontal ligament fibroblasts (HPDLF) in vitro.

Methods: The proliferation of HPDLF to three perforation repair materials were examined by methyl thiazolyl tetrazolium (MTT) assay at 1, 3 and 5 days.

[Morphology and microleakage study of repairing subpulpal wall perforation with resinous inlay].

Objective: The purpose of this study is to study the sealing ability and the furcal appearance of repairing subpulpal wall perforation with resinous inlay.

Methods: Fifty newly extracted human molars were randomly divided into three experiment groups (group A, group B, group C, 15 teeth each) and one control group (5 teeth). In experiment groups, perforations were made perpendicularly to the center of the pulp chamber floor.

[Study of apical diffusion of three different kinds of calcium hydroxide preparations in vitro].

Purpose: To investigate the diffusion effect of calcium hydroxide in periapical simulation of the diffusion model.

Methods: Pipetman pipette tips, plastic syringes and BHI agar were prepared to be periapical simulation of the diffusion model. 120 simulation models were divided into three groups.

[Use of calcium sulfate as internal matrix to repair furcal perforations].

Objective: To evaluate the effect of internal matrix on sealing ability and furcal appearance of perforations repair with amalgam and resin.

Methods: Perforations created in the pulpal floor of human extracted molars were repaired as follows: Amalgam, amalgam plus calcium sulfate, light-cured resin, and resin plus calcium sulfate (15 teeth/group). The furcal appearance of samples was evaluated under an operating microscope after repair.

[Antibacterial effect of Jinzhi Hanshuye on infected root canals].

Purpose: To evaluate antibacterial effects of Jinzhi Hanshuye on infected root canals.

Methods: 30 infected single-root-canals were collected from 27 clinical patients, and randomly divided into two groups. In the experimental group, Jinzhi Hanshuye was used as irrigating solution and intracanal medicament, while in the control group tosylchloramide sodium irrigating and calcium hydroxide disinfecting root canals were adopted.

[Clinical analysis of 1 423 cases of root canal therapy].

Objective: To evaluate the clinical quality of root canal therapy (RCT) in West China Dental Hospital of Sichuan University.

Methods: 1 423 RCT teeth were finished from Mar. 2001 to Feb.

[A study of the related factors and prophylactic measures of endodontic interappointment emergencies].

Objective: To estimate the related factors and prophylactic measures of endodontic interappointment emergencies (EIE).

Methods: The clinical cases were divided into three groups. Cases in the routine group were treated according to the routine procedures of root canal therapy.