مجله دانشگاه علوم پزشکی گیلان
پیاپی 45 (بهار 1382)

Lichen planus is a common immunologic mucocutaneous disease. Dr. Wilson described this disease entity for the first time. Then experiments were done to distingiushe details of disease and its treatments. Since that time different topical or systemic Corticostroides has been applied for treatment.

The aim of this investigation was to determinate the efficacy of aqueous suspension of Triamcinolone Acetionde 0.2% in treatment of Lichen Planus.

This Quazi experience Study has been done in 30 patients with oral lichen planus in faculty of Tehran University of Dentistry. Biographic information, background of systemic disease and any variations in clinical course of the disease scored and then recorded. Patients’ sign and symptoms and their responses to treatment were assessed.

From 30 patients 21 were female and 9 were male. Mean age was 44.4 years. The result of this study indicated relief of symptoms in 86.7% of patients after rising the mouth wash. Complete healing and repair of lesions occurred in 6 patients, more than 50% repair was seen in 16 patients and repair up to 50% in 7 patients. Changes in sign and symptoms after applying drug through paired t- test showed significant differences.

According to adverse effects of systemic corticostroids applying this mouthwash is strongly recommended in these patients. Particularly in patients with wide spread lesions rising with mouth wash is more comfortable for the patient than applying ointments.

Bite plane is an important devices for diagnosing and treating the patient with T.M.J dysfunctions.

The aim of this research is to study its effects on EMG activity of mastication muscles.

Twenty-five patients with TMJ dysfunctions were selected. EMG of masseter and temporal muscles (left and right) was recorded with surface electrode. Then, the subjects were freated by the bite plane. The wave were taken in both muscles in three positions, include rest position (r), maximum intercuspation position (co) and maximum clenching (cl). Bite plane was made for all patients from cold cure acrylic resin. Before the use of bite plane, E.M.G was gotten two sides of mastication muscles then it was used for 3 months only at nights and after that E.M.G will be repeated and then they compare to each other with analysis of pair-t-test.

The mean activity of masster and temporal muscles decrease in the left and right side of patient after use of bite plane (P<0.05). The mean duration masster muscle didn’t have significant difference after treatment.

Bite plane in patients with T.M.J disorders cause to decreases activity of contraction of mastication muscles it may before importance of temporal muscles in position of mandibular joints. But, the masster muscle is less affected by bite plane.

One of the normal landmarks in panoramic radiograph is in upper portion of mandibular ramus, which is termed medial sigmoid depression. Prevalence of this normal finding may be variable in different skeletal classification. Because this area is thin, it may also increase the potential for complications in orthognatic surgery if this area is involved.

Comparing the prevalence of medial sigmoid depression in panoramic view of orthodontic patient based on facial skeletal classification was objective point of this study.

In this study, 465 panoramic and lateral cephalometric views of patients (Including 236 cl.I, 141 cl.II and 88 cl.III patients) before orthodontic treatment were evaluated. Planmeca 2002 EC Proline Panoramic Machine provided all of radiographs. Angle classification was done by some orthodontists through study of cephalometry and consideration of their patients’ clinical status. Then panoramic radiographs were evaluated to determine present or absent of finding of medial sigmoid depression on RT and LT sides and categorized this finding to“ Marked” and “slight” criteria.

According to present study, prevalence of this depression was more common in skeletal cl.II (RT: %38.8, LT %39) and cl.III patients (RT: %23.9, LT: %38.6) in comparison with cl.I group (RT: %21.6, LT: %26.7) thus this finding has relationship with facial skeletal abnormalities. There was no correlation between this finding and side of involvement. No significant statistical difference was observed between the radiographic criteria of this depression in different skeletal classification.

High prevalence of medial sigmoid depression in patient with skeletal problem and more needs to orthodontic surgery in these groups were The most important results of consideration and attention to this area before mandibular osteotomies for prevention of any side effects.

A variety of surgical techniques have been used to cover recession type defects. Yet, improving the results of root coverage techniques for Miller class III and IV recession defects is a matter of concern.

The present study aimed at evaluating the clinical outcome following treatment of localized gingival recessions (including Miller class III and IV) by six different grafting procedures.

Twenty patients with overall twenty-seven Miller classes I to IV Buccal gingival recessions participated in this study, from the year 1379 to I381. After completing the phase I periodontal therapy for all the patients, following clinical variables were recorded: The apical extent of the gingival recession, the width of the recession defect measured at the Cemeto-enamel junction (CEJ), as well as probing depth and attachment level.

All grafting procedures resulted in a significant gain (p<0.005) of root coverage and statistically significant reduction in probing depth and gain of attachment level (p<0.005).

All six grafting procedures evaluated in this study offer predictable and convenient approach as root coverage procedures in Miller class I and II recession defects. Combining pedicle grafts with free connective tissue grafts (combined procedures) seems to improve the results following surgical treatment of Miller class III, IV and wide class II recession defects.

Several developmental anomalies have been frequently seen to occur in the oral cavity, including the tongue that causes burning sensation, pain and dysfunction. Geographic tongue, Fissure tongue and Ankyloglossia are in this category. The congenital and environmental effects of these anomalies have been pointed out in a few investigations. The frequency of these anomalies has been surveyed in different communities using different methods.

The purposed of this study that was conducted in 2003, was to determine the frequency of different morphological variations of the tongue in a population of school children aged 7 – 12 years in Lahidjan, Iran.

A total 1120 subjects (560 boys and 560 girls) that represented the study population, were studied in a multistage cluster sampling. Each school was considered as a cluster of 70 subjects that were selected by random selection in view of the total sample size.

The results indicated a frequency of 13.4% for geographic tongue, 11% for Fissure tongue, 6.7% for Ankyloglossia also there was a significantly higher frequency of Fissure tongue (P = 0.002), Geographic tongue (P = 0.007) and Ankyloglossia (P= 0.002) in boys than girls.

The present study indicates a higher frequency of tongue abnormalities than previous studies, however further investigations are required to indicate if hereditary and congenital factors play a vital role or if the environmental factors in this region vary with those in other regions.

Pay attention to Acrilie Reinforced Denture is important for dentists especially in elder persons that have less control on them.

The aim of this study is comparison of transverse strength in PMMA rein forced by Wire and Iron Mesh.

In this research thirty hard, heat curing acrylic in dimensions of 31570 mm which was selected in ten samples for each Parameter. The selected groups were reinforced with putting 1/00 mm Wire (Group 02) and Mesh (Group 03). Every Single Sample was constructed and generated, even the control group, Which was without any sort of reinforce processing was tested using an Instron device where its strength was thoroughly evaluated. The outcome of the following experiments illustrated the fact that using Wire 1.00 mm increases the strength whereas using the Mesh decreases such strength this experiment proved this fact to the point. Furthermore, when samples where tested through using Wire 1.00 mm, the transverse strength increased up to twelve percent, which shows the fact that the acrylic could be generated even without increasing the volume or the dimensions. Therefore, there will less chance of denture to break down if a thicker wire is used. (1.00 mm Wire) This is carried out on aged patients who are mostly unable to take care of their own denture and use this process to increase the stability in the areas where most of the pressure and use stress is focused on, in which the risk decreases to about twelve percent.

The increasing trend of research concerning bonds between Metal, porcelain, … and dental tissue of enamel and dentine, to determine which bonding agent has a higher quality in particular conditions has been going on.

This research was carried out to compare three types of bonding agents Panavia Ex, Mirage bond Flc and Optibond in shear bond strengths porcelain and tissue of enamel.

In 60 samples of human teeth which were divided in three groups of A, B and C (each group consisting of 20 samples) porcelain was bonded to enamel with these three bonding agents, then they were put under the Instron machine with shear force of On the porcelain near the bonding place. According to the separation time of porcelain from enamel the bond strength power was obtained.

After calculating the average figures and variance analyzing (Anova) and also using Scheffe, Duncan, Tukey Hsd Test, these results with were reported in groups A, B and C respectively: Panavia Ex 4.39 Mpa , Mirage Bond Flc 10.41 Mpa and optibond with the most shear strength of 15.90 Mpa

Regarding to the result of this research, optibond material was found to have a higher shear bond strength, comparing with the two other substances. Therefore it can be used to bond Inlay، Only and porcelain crown to the tissue of enamel.

The Fabrication of dental prostheses for patients with Microstomia has been a problem for dentists for a long time. Microstomia often seen in patients who suffer from Scleroderma, burns, surgical removal of malignant lesions or congenital deformities.

This article describes a patient whose face was burned by hot water and it causes Microstomia. Partial removable prosthesis upper and lower by sectional Impertion technique was made for this patient. Initially, an impression of the mouth with conventional silicon, pour thin impression with dental Placter and at the end diagnostic cast was made, two sectional tray separately with acryl Cold cure, then was made the first final Impression with silicon rubber based. This impression Poured and separate the cast from the impression when the stone has set then second final impression was made, position the Cast made from the first impression in this impression, pour impression containing the Cast in dental Stone. Separate the cost from the impression after the stone has set. The Completed cast was prepared.

If the patient will be comfort with this prosthesis we achieve to our aim.