Combination of biomechanical evaluation and accurate placement of dental implants: a new concept of virtual surgery in maxillary and mandibular functional reconstruction.

Biomechanics are crucial for bony regeneration and survival of implants in functional maxillary and mandibular reconstructions. However, we know of no study that has included an analysis of biomechanics to guide the optimal position of a fibular graft in virtual surgery. This study was designed to evaluate the combination of biomechanics and accurate placement of implants for virtual surgery in reconstruction of the jaw using fibular grafts. Thirty-one patients had maxillary or mandibular reconstruction with vascularised fibular grafts and the immediate placement of dental implants. Virtual studies were made preoperatively to evaluate the biomechanics and to assess the position of the fibular grafts with minimal distribution of stress. All operations proceeded accurately and with no complications with a mean (range) of 14 (6-20) months' follow-up. According to the individual biomechanical evaluations, the optimal position for the fibular graft is probably the middle of the mandibular body or below the bottom of the maxillary sinus. The combination of biomechanical evaluation and accurate placement of dental implants is a new concept that could achieve good biomechanical positioning of fibular grafts in the jaw and a desirable level of accuracy for functional reconstruction.

[Colonic dialysis therapy of Chinese herbal medicine in abstinance of heroin addicts--report of 75 cases].

OBJECTIVE: To observe the efficacy of the colonic dialysis therapy of Chinese medicine in abstinance of heroin addicts. METHODS: One hundred and twenty five cases of heroin addicts were randomly divided into two groups: group A was treated with combined dihydroetorphine (DHE) and methadon therapy; group B, besides DHE and methadon, the addicts were given colon dialysis with Chinese herbal medicine from third day of the treatment through to the eighth day. RESULTS: The effect of group B was superior to that of group A in that the patients heroin abstinance symptoms disappeared more rapidly, the course of the disease was shorter and the effective rate raised to 100%. CONCLUSION: The cutaneous pigmentation could be removed through dialysis quickly which suggested that the method was able to remove toxic substances in the body and it would benefit the abstinance of heroin addicts.