مجله دانشکده دندان پزشکی اصفهان
سال هجدهم شماره 1 (پیاپی 78، بهار 1401)

Evaluation of alveolar bone thickness is crucial for proper implant placement and support and aesthetics of soft tissue around implant restorations. The aim of this study was to determine the relationship between skeletal protrusion of jaw and labiolingual inclination of teeth with maxillary and mandibular anterior alveolar bone thickness using computed beam computed tomography (CBCT).

In this descriptive-analytical study, cone beam computed tomography images were obtained from 100 patients referred to the radiology department of Tabriz Dental School from 2013-2015 before implant insertion. Maxillary and mandibular protrusion was determined by measuring SNA (Sella-nasion-A point) and SNB (Sella-nasion-B point) angles and labiolingual inclination of maxillary and mandibular anterior teeth was determined by measuring U1-NA (Upper 1-Nasion A point) and L1-NB (Lower1-Nasion B point) angles. Then, thickness of buccal bone was measured at three levels: 3 mm below the CEJ (A), the middle part of the root (B) and the apex (C). Data were analyzed by using descriptive statistics (mean and standard deviation) and Pearson’s correlation coefficient and p value < 0.05 will be considered statistically significant.

Mean thickness of bone was higher at level C than other two levels and lower at level A than others. There is no statistically significant relation between mean maxillary bone thickness and SNA (p value > 0.05) except for B region on canine (Pearson correlation coefficient = 0.305 and p value < 0.05). There is no statistically significant relation between the mean maxillary bone thickness and U1-NA. There is no statistically significant relation between mean mandibular bone thickness and SNB and L1-NB. (p value > 0.05).

There was no statistically significant relation between maxillary and mandibular protrusion and labiolingual inclination of upper and lower anterior teeth with alveolar bone thickness.

Recurring aphthous ulcers is a common and painful ulcer in the oral area. The aim of this study was to evaluate the impact of length of radiation in the same dose for the treatment of recurrent aphthous stomatitis. To date no similar study is available.

In this double-blinded clinical trial, 30 patients with minor aphthous ulcer that were referred to Oral medicine department of Islamic Azad university were selected according to convenience sampling and inclusion exclusion criteria and were randomly divided into two similar groups. Low level laser therapy with diode 660nm was used in group A with 200 mW and 20 seconds setting and in group B with 20 mW and 200 seconds setting in two sessions on the first and third days were used. The time of clinical healing and the pain intensity as VAS were recorded. Data were analyzed by Independent t-test and Mann-Whitney test (p value < 0.05).

The pain intensity from first day after the laser until the seventh day in group B was significantly less than group A (p value < 0.001). The mean size of lesion was significantly lower in the third day (p value = 0.03), fifth (p value < 0.001) and seventh (p value = 0.001). The mean clinical healing time in group B was significantly lower than group A (p value < 0.001).

According to this study's findings, longer time of irradiation in lower output power of 660 nm diode laser was suggested for treatment of recurrent aphthous ulcer.

Orthognathic surgery not only changes the appearance of the face and the occlusion, but also changes the biomechanics and force of chewing. The aim of this study was to evaluate the maximum changes in byte force after orthognathic surgery in class III patients.

In this clinical trial study, 20 class Ш skeletal patients referred to the School of Dentistry of Isfahan Azad University in the academic year 97-98 were selected and were divided into two groups before orthognathic surgery and 3 months after orthognathic surgery. The surgical technique in these patients was 2-jaw technique (Lefort 1 and BSSO). The area of the first right maxillary molar and the left maxillary first molar were measured at two intervals before surgery and three months after surgery. The sensor was first placed on one side of the first maxillary molar, then on the other side, and vice versa. The measurements were repeated three times on each side and the highest number was recorded as the patient's MBF (Maximum bite force). Data were analyzed using ANOVA and Tukey statistical tests (α = 0.05).

Mean maximum dental bite force was significantly decreased 3 months after surgery (p value < 0.001); this did not lead to a significant difference between maximum bite force and gender (p value = 0.244).

Maxillofacial surgery in class III skeletal patients reduces the byte force in 3 months after maxillofacial surgery.

Microleakage has always been a problem in restorative dentistry. To decrease microleakage, different restorative techniques and materials have been recommended. The purpose of this study was to evaluate micro leakage of the composite restoration in deciduous anterior teeth using the open sandwich technique by two different liners.

This cross-sectional experimental study was conducted at Khorasgan University in 2019. A total of sixty intact deciduous canine teeth were divided into 3 groups of 20. At the buccal surface of the specimens, the Class V cavity was extracted at 1 mm below the CEJ (Cementoenamel junction) and in groups 1 and 2, ionoseal liner and Fuji II ionomer glass were placed at the buccal floor. Cavities were restored with Z250 composite resin. In group 3 which served as the control, restorations was perfromed without liners. All samples are prepared for establishment after dying in methylene blue 0.5% solution. The buccal lingual incisions with a thickness of 1 mm were inspected under stereo microscope for micro leakage. A total of 5 samples were extracted from each group via random sampling to examine the marginal compliance under SEM (Scanning electron microscope). The intergroup comparisons were made using the chi-square and Kruskal-Wallis tests. Besides, intra-group comparisons were performed using the Mann-Whitney U test. All statistical procedures were performed at a significance level of less than 0.05 (p value < 0.05) using Gpower software.

The outcome of this study showed that microleakage of gingival margin in open sandwich techniques with ionoseal and Fuji II (group 1, 2) was significantly higher than in control group (p value = 0.033).but in comparison between group 1,2 there was no significant difference (p value = 0.795). In SEM evaluation there was no significant difference in gingival microleakage (p value = 0.232).

Use of two liners: Ionoseal and Fuji II in Class V cavities restored by opensandwich technique in deciduce anterior teeth can reduce gingival microleakage.

Marginal adaptation is one of the key factors in the success of dental crowns. It is necessary to identify marginal adaptation in order to determine the spacing and prevent the onset of diseases. This study sought to use 3D and manual printing methods aiming at manufacturing heat press full-coverage extra-coronal restorations with more marginal adaptation.

This study was conducted in the year 1397-98 at the Islamic Azad University of Isfahan using descriptive-analytical and cross-sectional method with 20 samples. Ten samples were evaluated using a 3D printing method, and ten samples were assessed by manual wax-up technique. Results were analyzed using Kruskal-Wallis and Mann-Whitney tests.

There was a significant difference between the restoration space and the marginal edges in eight parts of the teeth in the manual method (p value < 0.001). The marginal edge space in the eight parts of the tooth was not significantly different in the 3D print method (p value = 0.614). A significant difference was observed in restoration space and the marginal edge between 3D printing and manual techniques (p value < 0.001).

The compatibility of the complete outer crowns of the heat press in the 3D printing method was not significantly different from the manual waxing method.

Proper diagnosis and administration of medication is one of the main aspect of treatment done by healthcare workers, such as dentists. Therefore, they should have enough knowledge, act precisely regarding the drug selection, dosage, and duration of treatment. The current study aimed to assess the knowledge and practice of the senior dentistry students and general dentists in Isfahan.

The present descriptive, analytical, and cross-sectional study was done on 99 senior dentistry students and 89 general dentists in 2018 in Isfahan. The questionnaire of this study contained 3 parts, including demographic details and information on knowledge and practice. The obtained data were analyzed with SPSS version 25 and the two groups were compared (p value < 0.05).

The knowledge of the dentists and students at the poor level comprised (2.2% and 3% respectively), in moderate (82% and 82.9%) and in good (15.8% and 14.1%), respectively and for practice, for low (7.9% and 5%), moderate (84.2% and 89.6%) and good (7.9% and 8.1%), respectively. The practice of both dentist (p value < 0.001, r = 0.417) and students (p value = 0.03, r = 0.213) was remarkably associated with their knowledge. The comparison of the knowledge (p value = 0.30) and practice (p value = 0.33) between dentists and students showed no statistical difference.

According to the result of this study, it seems that conducting further training programs and making educational pamphlets on drug prescription can help increase the knowledge and practice of dentist dentistry student.

With theincrease in the use of dental services and the increase in the use of different materials in several fields, the prevalence of allergic reactions to these substances has also been rising. In this situation, the diagnosis of allergic reactions and their prevalence among dentists is important. The purpose of this study was to determine the prevalence of these reactions among students, residents and faculty members of Isfahan Dental School.Materials &

This descriptive cross-sectional study was conducted at Isfahan Dental School using a form for data collection in 2018, which was provided by professors and colleagues from the Immunology Department of Isfahan University of Medical Sciences, on clinical students, residents and faculty members of Isfahan Dental School. Finally, the data were analyzed using descriptive statistics, Chi-square methods (p value < 0.05).

Of 200 participants in this study (152 students, 23 residents and 25 faculty members), 64 % showed allergic reaction to at least one dental workplace (69.1 % among the students, among the faculty members was 40.7 % and among the faculty members was 56 %). The most common allergic reaction among all participants was skin itchiness, hives, and respiratory responses. The pre-clinical and laboratory sections had the highest prevalence of allergic reactions.

The results of this study showed that the prevalence of allergic reactions caused by allergens in the dental environment is very important and the most common reactions is skin reactions and subsequent respiratory reactions. Also, among the most common allergy to dental materials was latex gloves.

Oral health is an important factor affecting quality of life. This research examined the correlates of demand for basic dental services among the Iranian households.

This research was a secondary data analysis of cross-sectional data in which the data extracted from National Survey of Iran’s Household Income and Expenditure Survey-2018 were analyzed. The study sample included 17548 eligible households from whole country. The logistic regression model was used to analyze demand for basic dental services. Three regression models were estimated.

The probability of demand for basic dental services was reduced as households’ heads were more educated, non-married or unemployed (p value < 0.05). The probabilities of demand for basic dental services were higher among households of higher income quintiles comparing to the first income quintile (p value < 0.05). Furthermore, the probability of demand for basic dental services was higher among those households with elderlies aged more than 70 years old or those households with children aged between 6-12 years old (p value < 0.05).

The possibility of demand forbasic dental services was correlated to demographic and economic factors as well as age component of household’s members. As a result, dental health policymakersshould pay attention to demographic and economic status and age status of population.

Professional ethics in any field of medical specialties lead to better communication between patient and doctor and ultimately improve the quality of health care and patient satisfaction will follow. So, we aimed to evaluate the professional communication skills in students before and after training in an attempt to improve the clinical skills in all students of medicine and dentistry.

This quasiexperimental study had 100 dental students from Isfahan University of Medical Sciences enrolled in the year 1395 before and after taking the course and were rated using valid and reliable questionnaires and then the scores were compared. The data was analysed via independent-t test and co-variance. P value = 0.05 was considered statistically significant.

Based on the results of data analysis a difference between the level of students' knowledge before and after the lessons were observed. Moreover, the mean score for men and women after completing the course did not significantly differ. Based on the results of independent t test scores in men and women's clinical skills before taking the course, there was no significant difference (p value = 0.689). There was no significant relationship between other subscales and gender before and after training (p value = 0.2).

According to the results of data analysis, the theoretical presentation of the course has improved students' perceptions ofclinical skills. Therefore, taking into account the views of dental students is one of the necessary elements in improving the education and training of oral health care providers in the community in the future.

Evaluating the dimensions of buccal and palatal alveolar bone in the anterior maxillary teeth is very important in patients who are candidates for immediate implant replacement. The aim of this study was Assessment of buccal and palatal alveolar bone thickness in maxillary anterior teeth on cone beam computed tomography (CBCT).

In this descriptive-analytical study, 78 CBCT images of patients referred to Radiology Department of Khorasgan Dental Faculty were evaluated. The collected data included the measurement of the bone thickness of the alveolar buccal and palatal anterior maxillary teeth at three locations of the crest, the middle region of the root and apex with the Sidexis software. Then, the measurements were compared between males and females. The data were analyzed by T-test statistical methods.

The mean thickness of the buccal alveolar bone in the crest region and the middle region of the central, lateral and canine teeth was less than 1 mm. The mean thickness of the buccal alveolar bone at the apex site of the central, lateral and canine teeth was more than one mm. The mean thickness of the palatal alveolar bone in the crest region of the central, lateral and canine teeth was less than one millimeters. The mean thickness of the palatal alveolar bone in the middle region of the root and apex was more than one mm. There was no statistically significant difference between the sex and thickness of the buccal alveolar bone, except at the apex of the central and lateral teeth (p value > 0.05). Between sex and thickness of palatal alveolar bone, in the crest of lateral and canine teeth and in the middle root and apex area of all three central, lateral and canine teeth in men were significantly more than women (p value < 0.05).

The buccal alveolar bone was present in most of the points examined at the crest and mid-root site, and the palatal alveolar bone was at the crest site at most checked points with a thickness of less than 1 mm.

The curve of spee is very important in complete oral reconstructions and can be used as a reference for prosthetic and orthodontic reconstructions. This study assessed the curve of spee in the maxilla and mandible and its relationship with the overjet and overbite in class I, II, and III malocclusions in Iranian population. In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II, and III.

In this descriptive cross- sectional study, 75 pairs of dental casts with permanent dental system and having second molars, available in the clinic of Khorasgan Azad University and private orthodontic offices were selected and divided into three groups of 25 based on malocclusion I, II and III. The radius and depth of curve of spee were obtained. radius of the curve of spee, the tip of canine cusps, the mesiobuccal of the first molars, and the distobuccal cusps of the second molars were joined together in the form of an arch. To measure the depth of curve of spee, the reference plan was drawn from buccal canine cusp to distobuccal cusp of the second molars. The perpendicular lines were drawn from this line to the edge of the premolars cusp, the first molar and the second molar mesiobuccal cusp and the deepest part was regarded for the measurements. Overjet was measured as an average of 6 upper anterior teeth and overbite as an average of 4 anterior lower teeth and the values of radius and depth of horseshoe curvature and overbite and overjet values were analyzed by One-way ANOVA and Tukey test and Correlation between data was also examined by Pearson correlation coefficient test (p value = 0.05).

In class II malocclusion, overbite values had a significant relationship with radius (p value = 0.02) and depth of the curve of spee (p value = 0.04), in class III malocclusion, overbite values had a significant relationship with the curve of spee (p value = 0.001) had. In class II malocclusion, the curve of spee was deeper and overbite values were higher, and also in the class III malocclusions, a direct relationship existed between the curve of spee and overbite.

Curve of spee effects the values of overjet and overbite, and the presence of increased overbite results from a deep spee curvature.

The inferior alveolar canal is an important anatomical structure in the field of dentistry implants and cone beam computed tomography (CBCT) is an important diagnostic technique. The aim of this study was to evaluate the prevalence of anatomical variations of the mandibular canal observed in CBCT images.

This descriptive-analytic study 384 inferior alveolar canals were evaluated in 192 patients who were referred to the radiology department of Isfahan Azad University in 1396 for a cone- beam computed tomography. Radiographs were performed to assess the frequency of different left and right mandibular canal segregations by sex in terms of upper and lower position, baccolingual position, shape of the general canal. The frequency and different types of existing mandibular plug canals were also evaluated. Data were analyzed by Chi Square, independent T-test, Paired t- test (p value < 0.05).

The mandibular canal was 2.1% of the lower position, 11.9% of the upper position and 86% of the middle position. Statistically significant differences were observed between the frequency distributions of canal positions and gender(p value = 0.004). The prevalence of Bifid mandibular canals was 14.8%. There was no significant relationship between the shape of the general channel path and gender. There was no significant difference between the mean distance between the mandibular canal and the buccal cortex in both Molar and Ramus with the sex of the subjects and the side of the canal (p value < 0.05).

The highest frequency of mandibular canal in most subjects was on the right in the intermediate position. The mean distance between mandibular canal and buccal cortex in Ramos and Molars area on both right and left sides was not significantly different between men and women.

Nowadays laser can be used in many dental procedures. Some of the advantages of laser surgery in oral soft tissue lesions treatment are: reduced need to use local anesthesia, minimal bleeding, faster healing and reduced risk of post-operative complications. Due to above reasons laser was used for treatment of this irritation fibroma case.

 In this case report an irritation fibroma lesion in 54 year old female was removed by CO2 laser surgery and the surgery procedure healing and patients comfort have been evaluated.