[Therapeutic effect of liposome on II degree burn wound]

OBJECTIVE

To study the therapeutic effect of Suyuping in which liposome is the main constituent on II degree burn wound.

METHODS

From October 1998 to October 1999, 42 cases with II degree burn wound were adopted in this study. Among them, there were 30 males and 12 females, the average wound area was (23.4 +/- 9.7)%. The wounds on the left side of body were managed with sulfadiazine argentum(SD-Ag) while that on the right side with Suyuping. Healing and other situation about the burn wounds were observed and recorded at times.

RESULTS

Forty-two patients completely healed when discharged from hospital. The average wound area managed with Suyuping was (11.2 +/- 7.3)% and the area with SD-Ag was (9.4 +/- 5.8)%. The mean healing time of Suyuping group was(18.4 +/- 4.7) days while that of SD-Ag was (23.5 +/- 7.9) days, there was significant difference(P < 0.05). Suyuping group presented few wound pain, allergy, bleeding and the side effect was less.

CONCLUSION

Suyuping can accelerate wound healing and attenuate wound pain, allergy and bleeding, it is a potential and specific topical agent for treating II degree burn wound.

[The effect of heparin on wound healing of second-degree burned rats]

OBJECTIVE

To study the effect of therapeutic effect of heparin on wound healing of second-degree burned rats.

METHODS

Deep second-degree burns with 20% of total body surface were made in 20 rats, which were randomly divided into 2 groups. The experimental group was treated subcutaneously injection with 1 ml of heparin 100 U/kg and saline solution, and the control group was treated with 1 ml of saline solution, once a day until complete healing of the burned wound. The healing time were compared, the growth of granulation tissue and collagen fibers were evaluated under light microscope, and the growth of fibroblasts were observed under electronic microscope.

RESULTS

All rats survived, the healing time of experimental group (22.8 +/- 1.87 days) were much shorter than that of control group (26.2 +/- 2.82 days) (P < 0.005). Light microscope observation showed that the growth of granulation tissue and collagen fibers of experimental group were much better than that of control group, and electronic microscope also showed that the fibroblast growth was obviously better in the experimental group.

CONCLUSION

Subcutaneous injection of heparin can promote wound healing.

[Effectiveness of recombinant human growth hormone treatment for severe burn injury]

In order to investigate the effectiveness and safety of recombinant human growth hormone(rhGH) treatment for severe burn injury, we designed a randomized prospective study. The patients in rhGH group were given rhGH in a dose of 0.5 IU/(kg.d) subcutaneously between days 3-17 post-burn. Indices about protein metabolism, wound healing, hepatic and renal function and blood were measured regularly. Patients were monitored until their wound healed sufficiently so that they could be discharged for rehabilitation. The results showed: all patients survived; the rhGH group had less weight loss, increased level of serum albumin and shorter healing time of deep partial-thickness burn and donor site. The hospital stay time decreased from the control value of 45 +/- 17 days to 37 +/- 12 days for rhGH treated patients, i.e. a significant improvement. Resistant hyperglycemia was present in 2 patients in the rhGH group and disappeared after transient insulin administration. This study demonstrates that rhGH treatment for severe burn injury has obvious beneficial effects with slight side-effects.

[Preparation of tea polyphenols sustained-release microcapsule]

With ethycellulose (EC) as matrix tea polyphenols (TP) microcapsule was prepared by using emulsion solvent evaporation technique. Effect of preparation condition on size and drug entrapment efficiency of microcapsule was investigated. We also investigated the drug entrapment effect of microcapsule. The result showed that the tawny microcapsule with highly porous surface was obtained by using polyvinyl alcohol (PVA) and sodium dodccyl sulate (SDS) as dispersant. The stirring rate, polymer concentration and drug payload affected the size and drug entrapment efficiency of microcapsule. The matrix and preparation method do not damage the ingredient of TP. The microcapsule can improve the stability of TP and sustain TP released.

[Evaluation of plant protectants against pest insects]

An interference index of population control (IIPC) was constructed for investigating the complex effects of plant protectants, including the effects of repelling insect pests away from the plant, deterring the egg laying of adults and the continuation of feeding, and causing death by toxicity. At the same time, indicated by IIPC, the alcohol extracts of some common plants, such as Eucalytus rubusta, Wedelia chinensis etc. and the neem oil gave very good results to protect the plant against Plutella xylostella. The D-C-Tron NR Petroleum Spray Oil (CALTEX) also gave an excellent effect to protect citrus against red mite. All the experiments show the important role of the repellent effect on the pests.

[Effect of L-arginine supplementation on partial-thickness burned patients]

OBJECTIVE

L-arginine is a semiessential dibasic amino acid for humans and animals. This paper aims to investigate the therapeutic effect of L-arginine supplementation on partial-thickness burned patients.

METHODS

A randomized controlled clinical trial was designed to evaluate the cellular immune function (T cell count, ratio of CD4/CD8, natural killer cell activity and IL-2 level) and protein metabolism (transferrin, prealbium and nitrogen balance) of patients in the experimental group which daily given 15 g arginine and the control group which daily given 25 g glycine.

RESULTS

The natural killer cell activity and IL-2 production in the experimental group were higher than that of the control group. The suppression of transferrin and prealbium was alleviated and the nitrogen balance was improved in the experimental group.

CONCLUSION

It suggests that exogenous arginine supplementation is beneficial for recovery of cellular immunity function and protein anabolism in partial-thickness burned patients.

[Effect of arginine on deep partial-thickness burn in rats]

To investigate the therapeutic effect of arginine on burn, a randomized controlled trial in 20% TBSA deep partial-thickness burned rats was designed. The rats' wound healing, cellular immunity and nitrogen balance were evaluated at appointed postburn days. The results showed that the arginine group got better wound healing and faster recovery of cellular immunity, and achieved positive nitrogen balance. These suggest that supplement of exogenous arginine after burn may be beneficial to the victim in promoting would healing, reducing postburn immune suppression and enhancing anabolism of protein.

[Effect of gamma-interferon on the fibroblasts in hypertrophic scars]

OBJECTIVE

To study the influence and mechanism of gamma-IFN on fibroblasts in hypertrophic scars(HTS).

METHODS

The cultured fibroblastic cells were isolated from the hypertrophic scars of 10 patients. The fibroblasts were divided into two groups, one group was treated with gamma-IFN (100 U/ml, 5 days) and the other without gamma-IFN as control. The proliferative activity in both groups was investigated and compared by blood cytometer, the proportion of myofibroblast (MFB) and the ratio of apoptosis were examined and analysed between two groups by flow cytometry using alpha-smooth muscle actin (alpha-SMA) as marker.

RESULTS

The proliferative activity was downregulated with gamma-IFN. In gamma-IFN treated group, the differentiation of MFB were reduced and the decreasing ratio was 3.2% at the 2nd day and up to 10.5% at the 8th day, then it reduced gradually. The apoptosic ratio is 17.7% in gamma-IFN treated group, and is 10.9% in control group. The difference was statistically significant.

CONCLUSION

gamma-IFN could downregulate the proliferation of fibroblasts, decrease the differentiation of MFB and induce the apoptosis. It has beneficial effect in the treatment of hypertrophic scars(HTS).

[Two-stage operation in the treatment of severe cicatricial adhesion on submental-thoracic region]

In order to decrease the risk of operation, complete release of scar tissue and reduce the recurrence after operation, from February 1994 to March 1997, seventy-three cases of severe cicatricical adhesion on the submental-thoracic region were treated with release and resection of scar tissue, and delay skin graft. The grafted skin was survived completely after operation. The result from the release of scar tissue of the cervical region was good. The physiological angle of submental-thoracic angle was recovered. It was thought that two-stage operation for submental-thoracic cicatricial adhesion would decrease the risk of operation and be advantageous to the release of contracted soft tissue of anterior cervical region and reduce the recurrence of contracture. The interval between the two stages of the operation was 2 to 3 days, which did not increase the rate of infection of the wound. The shortcomings including increase of pain to patient and prolong the time in hospital.

[The preliminary study on WCMM machinable glass-ceramics]

The aim of this work was to investigate machinable glass-ceramics used as oral restoration material in K2O-MgO-Al2O3-SiO2-F glass system. By using of DTA, XRD and SEM investigation, the crystalline structure and characteristics were tested. The chemical composition of WCMM machinable glass-ceramics was defined by the following general formula: (K,Na)Mg3-3x Al2x (AlSi3) O10F2(0.5 < or = x < 0.7). The experimental results show that WCMM is an excellent oral restoration materials in the fabrication of crowns, inlayers and veneers.

[The study on apatite castable glass-ceramics in composition and physicochemical properties]

The authors reported the result of the study of the glass formation range and physicochemical characteristics of apatite (APA) castable ceramics in the CaO-MgO-Al2O3-SiO2-P2O5 system. The relationship between its component and casting properties, the mechanical property and chemical stability was mainly discussed. The result showed that homogeneous glass could be formed in the experimental scope. This glass crystallized enamel-analogous apatite phase. It has improved mechanical property of parent glass, the bending strength was up to 165 MPa and possessed a fine chemical stability. This investigation could provide a new castable ceramics material for dental restoration.

[A three-dimensional finite element stress analysis of implant-supported prosthesis and its supporting tissue in the edentulous mandible. Part 5. The influence of implant type in complete implant overdenture and its supporting tissue]

The stress distribution of implant, implant-bone interface, alveolar ridge surface and the overdenture when supported by cylindrical-type or blade-type implants under three kinds of occlusion, were investigated respectively in this study. The results showed that the extreme principle stress was greater when the denture was supported by blade-type implants than by cylindrical type one. The stress distribution of the system with application of cylindrical type implant is more acceptable.

[A three-dimensional finite element stress analysis of implant-supported prosthesis and its supporting tissue in the edentulous mandible. Part 6. The influence of superstructure in mandibular complete implant overdenture and its supporting tissue]

The effect of superstructure, including telescope, conventional-bar and modified-bar, on the stress distribution of mandibular complete implant overdenture and its supporting tissue was investigated in this study. The results demonstrated that bar could lower the extreme principle stress of the implant, but the stress distribution of implant-bone interface was better when the implants were not linked with each other. Modified-bar is not preferred because it increases the stress of implant and its interface.