effect of barrier membranes on regeneration of bony defects in human and animal models a systematic review

Barrier membranes have been extensively used for bone regeneration. However their effectiveness is still under investigation. This review was designed to answer the following question: [Do barrier membranes affect the successfulness of bone graft/ bone substitute materials?]. Published articles were collected through hand and electronic searching in medline, embase and central databases. Controlled animal and human studies which had evaluated efficacy of membranes in defects other than periodontal lesion, extraction socket preservation and maxillary sinus graft, and had more than 4 weeks follow-up period were considered. Articles which had assessed membrane effect on oseointegration of implants, or had used osteoinductive materials in the bony defect were excluded. Meta-analysis was performed in the following groups: vertical bone augmentation, horizontal bone augmentation and eventful healing. Due to different outcome measurement, analysis was not done for horizontal bone augmentation. A total of 34 studies were selected. Meta-analysis of studies for vertical bone augmentation revealed that membranes may increase the amount of augmented bone [mean difference= 0.32 mm; P=0.006]. No statistically significant differences were observed among groups in case of eventful healing both in human [odds ratio- 5.67; P-0.32] and animal studies [odds ratio- 3.35; P=0.12]. Available evidence suggested that membranes might be useful for vertical bone augmentation. There was not strong evidence that membranes have an adverse effect on the healing process of the wound. More randomized clinical trials are necessary for applicable results

Evaluation of stability in advancement genioplasty: an 18-month follow-up

The main aim of advancement genioplasty is soft tissue and hard tissue stability which is important in improvement of the patients' aesthetics. The evaluation of the soft and hard tissue stability in advancement genioplsty was the aim of this study. The subjects in this study were 15 patients who presented with retrognathia. All of the 15 patients underwent advancement genioplasty alone to correct retrognathia. The soft and hard tissue pogonion in pre-operation, immediately post-operation, and 18 months after operation in tow groups of 9 patients with genial advancement equal or greater than 7 mm [means 7.16 mm] were assessed. After operation, no patient had infection or dehiscence and bone instability. In group 1 with advancement less than 7mm, hard tissue pogonion relapse was 0.60 +/- 0.66mm and soft tissue pogonion relapse was 1.55 +/- 0.46mm. I group 2 with advancement equal or more than 7mm, hard tissue pogonion relapse of 1.6 +/- 0.46mm and soft tissue pogonion relapse of 1.8 +/- 0.68mm were observed. Advancement genioplasty is a predictable operation specially when using rigid fixation. In this study, the result of operation in an 18 month period was stable

[Knife inflicted injury in cheek piercing through the throat [a case report]]

Penetrating Knife injuries to the maxillofacial region are quiet rare and infrequently reported. In these few reports knife involves various fossae: Orbit, Maxillary and etmoidal sinus, blood vessel or throat. It can cause hemorrhages, neurological lesions, visual acuity loss and fracture. The reported case is a 28 y/o man in whom a knife has penetrated from below the zygomatic arch crossing the intercondylar notch and coronoid, petrigoid plate and reach throat fossa without affecting vital structures such as skull, sinuses or main vascular branches. The approach to treatment and surgery plan should be V multidisciplinary. Surgical removal of complicated foreign body penetrations involving vital structures in maxillofacial region, is a very tender and sensitive approach. Knife specially endangers some important organs such as facial nerves and main vascular trunks. The knife was removed from the entrance wound in throat and no complications were observed either during or after surgery with any untoward sequelae

[ ten years epidemiologic study of salivary gland tumors in Loghman Hospital]

Salivary gland tumors are rarely reported comprising 2-3% of head and neck neoplasms. About 75% of salivary gland tumors are benign and 25%a are malignant. Major salivary glands include parotid, submandibular and sublingual while minor salivary glands distribute through submucosa of palate, lip and buccal mucosa. The present study was done to evaluate salivary gland tumors in patients referred to Loghman hospital during 1997-2007. In this retrospective descriptive study, patients with salivary gland tumors were studied by means of existing data technique. Data collection sheet included gender, age, location and size of tumor, clinical and pathologic diagnosis, pathological diagnosis and treatment. The histopathological analysis of all cases was meticulously reviewed and classified by 3 expert pathologists. Descriptive analysis was used for the analysis. Forty four patients were found with salivary gland tumors. 36.4% of them were females and 63.6% were males. Benign tumors calculated about 72.7% and malignant tumors as 27.3%. The most common tumors were pleomorphic adenoma [70.4%], warthin tumors [2.2%], and mucoepidermoid carcinoma [11.3%] was the most common malignancies. Parotid [77.2%] was the most common site following by submandibular gland [11.3%] and palate with 11.3% occurrence. The size range of tumors was 1-9 cm with the average size of 2-4cm. Pleomorphic adenoma was the most common benign tumor and mucoepidermoid carcinoma was the most malignant tumor resembling the other studies done in the field

epidemiology of mandibular fractures in patients referred to oral and maxillofacial department of Taleghani Hospital of Tehran, 1999-2003

The lower part of the face, especially mandible is more susceptible to fracture. This study was done to estimate the prevalence and the causes of mandibular fractures in the patients referred to Taleghani Hospital 1999-2003. The patients with mandibular fracture referred to Taleghani Hospital were studied. The site of fracture, the kind of surgery done, the causes of fracture were recorded and inserted into SPSS software. Four hundred and twenty seven patients [364 male, 63 female], between 3 to 83 years old were referred for mandibular fracture. The peak of incidence occurred in the ages of 20-30. The condylar fracture was the most frequent in mandible. Of the fractures, more than%45 of the fractures were due to car and motor vehicle accidents. Most patients [%71.1] were treated by close reduction surgery. To prevent the mandibular fractures it is recommended to obey the traffic rules and make the drivers to use safety devices during driving