جستجوی مقالات مرتبط با کلیدواژه « Edentulous » در نشریات گروه « پزشکی »

The posterior superior alveolar artery (PSAA) is a branch of the maxillary artery. This study compared the anatomical position of the PSAA in the maxillary sinus between edentulous and dentate patients using cone-beam computed tomography (CBCT).

This descriptive study evaluated 280 maxillary sinus CBCT scans of edentulous and dentate patients. Visibility, vertical diameter, location and type of artery, horizontal distance from the PSAA to the sinus internal wall, distance from the artery to the sinus floor, distance from the artery to the alveolar crest, and distance from the alveolar crest to the sinus floor were studied on coronal sections using SIDEXIS 3D software. Data were analyzed by the Chi-square, Spearman rank correlation coefficient, and independent t tests. 

The artery type was mainly type I, with no difference between males and females or edentulous and dentate patients (P>0.05). PSAA was primarily located in the second molar area in dentate patients. The horizontal distance from the PSAA to the sinus internal wall, PSAA vertical diameter, distance from the alveolar crest to the sinus floor, and distance from PSAA to the maxillary sinus floor were not different in different age groups (P>0.05). Vertical diameter of PSAA and distance from PSAA to the maxillary sinus floor were not different between edentulous and dentate groups (P>0.05).

The distance from the PSAA to the sinus internal wall and to the alveolar crest, and the distance from the alveolar crest to the sinus floor were smaller in edentulous patients.

Huge head and neck tumors are known to cause difficult ventilation and difficult intubation. Edentulous mouth can result in difficult mask ventilation. Head and neck tumor resections can also present hemodynamic challenge, due to their proximity to large vessels.
We herein report a clinical case of difficult ventilation due to large parotid tumor in an edentulous patient.

Aging is accompanied by the gradual loss of teeth, which can cause several orofacial changes. This study aimed to compare panoramic radiomorphometric indices between dentate and totally edentulous patients.

One hundred panoramic radiographs were analyzed to measure six indices using Clinview 9.3 software: the gonial angle (GA), antegonial angle (AGA), condylar height (CH), ramus height (RH), mental index (MI), and mandibular cortical index (MCI). An independent sample t-test and Chi-square was used to compare the means of the measured data between dentate and edentate subjects and genders.

In both genders, dentate people had greater left CH (p=0.05) and left GA (p=0.03). Men had greater RH in the dentate and edentate groups (p<0.001). No correlation was found between groups and genders in MCI scores.

CH index assessment as the function of the masticatory muscles and GA as residual ridge resorption were decreased in edentulous people. The findings highlight the importance of oral hygiene education and prosthetic rehabilitation of the edentulous.

Ideal implant placement decreases the postoperative surgical, prosthetic, and functional complications. This study aimed to design and fabricate a surgical guide for accurate positioning and angulation of dental implants in edentulous mandibular models and assess its efficacy.

After initial designing and fabrication of resin model of the surgical guide and eliminating its shortcomings, the final model was fabricated using 6061t6 aluminum alloy by a computer numerical control machine. The efficacy of the designed surgical guide was tested by placing 16 implants with the help of the surgical guide in two completely edentulousmandibular models. Next, cone-beam computed tomography DICOM images were obtained from the inserted dental implants, and analyzed by NNT Viewer software. One-sample t-test was applied to compare deviations of implant angle and distance from the planned angulation/position at P<0.05 level of significance.

The mean angular deviation between the planned and placed implants was 3.31±1.2° and 0.97±0.56° for 0° and 15° implants, respectively. The mean linear deviation between the planned and placed implants was 1.00±0.75 mm. Although the linear and angular differences between the planned and placed implants were statistically significant (P<0.05), they were clinically acceptable.

The designed surgical guide showed the expected efficacy with maximum mesiodistal angular deviation < 5° and linear deviation < 1 mm in 56% and < 1.5 mm in 75% of the placed implants, compared with the planned angulations/positions.

The aim of this study was to evaluate the length of styloid processes of edentulous and posterior dentate patients retrospectively using digital panoramic radiography. This study was carried out in southwestern of eastern Anatolia region Turkish population. In this study, 100 styloid processes of each of edentulous and posterior dentate patients were measured on digital panoramic radiographs. Styloid process longer than 30 mm was evaluated as an elongated styloid process. Recording of data was performed based on gender, side and groups, Chi-square and Mann Whitney U test were conducted for statistical analysis. Styloid process length was not found to be statistically significant between edentulous (24.9±6.66) and posterior dentate (25.75±5.64) groups (p˃0.05). The frequencies of Elongated styloid processes were not statistically different between genders, side or groups (p˃0.05). Being edentulous was not an important factor for the length of the styloid process and the likelihood of symptoms that might develop.

Several tools have been introduced to increase the accuracy of dental implant placement. This study aimed to design and fabricate a new surgical guide for dental implant placement in partial edentulism and assess its efficacy.

The designed aluminum surgical guide has eight accessories and one graded rocket. The accessories have 6, 7, 8 and 9 mm diameter, and 6 mm height. Each accessory pair has a hole for passage of 2 mm and 2.8 mm drills. The efficacy of the designed surgical guide was tested by placement of 15 dental implants in jaw models. Cone-beam computed tomography (CBCT) scans were obtained, and analyzed to assess the implant-tooth and inter-implant distances and inter-implant angulation using NNT Viewer software. Data were analyzed using one-sample t-test. P<0.05 was considered significant.

A significant difference was noted between the planned and actual values in the implant-adjacent tooth mesiodistal distance (P<0.001), and inter-implant distance (P=0.005). However, no significant difference existed in inter-implant angulation (P=0.073). The mean implant-tooth and inter-implant distances, and the mean inter-implant angulation were 0.284±0.199 mm, 0.0350±0.176 mm, and 3.883±4.20°, respectively. Conclusion The designed surgical guide had high accuracy in achieving optimal inter-implant angulation and linear implant-adjacent tooth and inter-implant distances, and the obtained mean values were clinically acceptable.

Maxillary sinus pathologic conditions increase the risk of complications during sinus augmentation surgeries in the posterior maxilla. The present study aimed to determine the frequencies of maxillary sinus pathologic findings on patients’ cone-beam computed tomography (CBCT) images to receive dental implants.

In this descriptive/cross-sectional study, 140 CBCT images of patients who were candidates to receive dental implants were evaluated for the presence of maxillary sinus pathologic entities during 6 months, were divided into five categories: mucosal thickening of >5 mm, retention cyst, partial or complete opacification of the sinus, polypoidal mucosal thickening, and healthy patients. Age, gender, and dental status were evaluated in terms of relationship with the sinus pathologic findings. Absolute and relative frequencies were used to describe data. The chi-squared test was used to analyze the variables. Statistical significance was set at P<0.05.

The frequency of maxillary sinus pathologic entities on CBCT images was 63.5%. The pathologic conditions in descending frequency were as follows: mucosal thickening (31.4%), retention cyst (17.1%), partial or complete opacification of the sinus (9.3%), and polypoidal mucosal thickening (5.7%). The frequency of pathologic findings in the maxillary sinus was higher in the <46-year age group and subjects with partial edentulism; however, the differences were not significant.

In the present study, the most frequent maxillary sinus pathologic entity was mucosal thickening. There was no relationship between age, sex, and dentition status and maxillary sinus pathologic findings.

Osteotomy of the lateral wall in the lateral window approach for sinus floor elevation carries the risk of perforating the Schneiderian membrane. In this regard, this study aims to evaluate the relationship between age and lateral wall thickness (LWT) of the maxillary sinuses in patients with posterior edentulism.

A total of 311-cone beam computed tomography (CBCT) scans are analyzed. To measure the lateral sinus, the deepest point in the maxillary sinus floor is selected, a tangent line is drawn to this point, and another line is drawn perpendicular to the previous line. On the latter line, three points are marked at 3, 7, and 10 mm distance from the sinus floor and three lines are drawn passing through these points parallel to the tangent line. The thickness of the lateral sinus wall is measured on these lines. LWT of males and females is compared in different age groups and patients with complete or partial edentulism. The collected data are analyzed using the one-way ANOVA, Scheffe’s test, t-test, and Pearson’s correlation coefficient.

There is a significant relationship between age and LWT of the maxillary sinuses. It is so that the LWT decreases as the age increases (P < 0.001). Also, the wall thickness of patients with complete and partial edentulism is significantly different (P < 0.05). There is no significant difference regarding gender (P > 0.05).

Age and edentulism type affect the LWT of the maxillary sinuses.

Background and aims. Occlusal rims are used to determine the jaw relationships in the transverse and vertical dimensions and estimate the inter-occlusal distance in edentulous patients. It is important to find ways to determine the height and shape of the occlusal rims correctly. The aim of the present study was to determine the exact distance between the oral cavity floor and the incisal edges of mandibular incisors to serve as a guide for adjusting the height of the mandibular occlusal rim.
Materials and methods. Forty patients were selected and special trays were fabricated to prepare accurate stone casts on which the measurements were made at 0.01-mm accuracy. Two marks were placed on the casts at the incisal edges of mandibular incisors and at anterior attachment oflingual frenum. Then the distance between these two marks was determined on the vertical spindle of a surveyor using a digital Vernier measuring tool and recorded.
Results. The results showed that the mean and standard deviation of the distances between the oral cavity floor and the incisal edges of mandibular incisors were 14.35±1.68 mm, with a range of 10.2‒17.02 mm. The mean distances in males and females were 15.42±0.97 and 13.28±1.57 mm, respectively. T-test showed significant differences in this distance between males and females, with greater distances in males.
Conclusion. The distance between the oral cavity floor and the incisal edges of mandibular incisors at anterior attachment of lingual frenum might be a proper criterion for the initial adjustment of occlusal rims.

Statement of the Problem: Insufficient information about the anatomical positions and structure of mandibular canal provokes unwanted damage to this important structure of mandible.
The aim of this study was to determine the visibility and anatomical variations of mandibular canal in digital panoramic radiographs of dentulous and edentulous patients in a sample of Iranian population.
In this retrospective-analytical research, 249 digital panoramic radiographs in dentulous group and 126 in edentulous group were studied by an expert oral and maxillofacial radiologist. In both groups, the visibility of canal borders in anterior, middle, and posterior areas were examined. In dentulous group, the distance between the canal and apex of the first and second molars were measured. Canal-to-alveolar crest distance and lower mandibular border was measured in three different points for both groups. Finally, the upper-lower positions of canals were determined.
In both groups, most visibility occurred in 1/3 of posterior and the least visibility was detected in 1/3 of anterior, with the intermediate being the most visible part (Type 2). There was no significant difference between the left and right sides in all cases. In dentulous group, no correlation was found between the visibility, age, and gender (p> 0.05); however, canal position was related to gender (p= 0.03 and p= 0.04 in right and left sides, respectively). High position was more frequent in females and intermediate position was more common in males. In edentulous group, no correlation was found between age, gender, and canal position (p> 0.05).
The most visibility of mandibular canal was in its third posterior and the least was in its third anterior part. Although the middle position of canal was more frequently visible than the high position in this study, it does not refute the possibility of damaging the mandibular canal in critical surgeries.

Questionnaire is a suitable tool for evaluating the subjective masticatory function in edentulous patients. However, there is no validated Persian version of masticatory function questionnaire. The aim of this study was to evaluate the psychometric properties of the translated Persian version of the quality of masticatory function (QMF) questionnaire in terms of validity and reliability.
After translation of QMF questionnaire to Persian, its validity was evaluated by four expert prosthodontists. The tool was applied on 62 complete denture wearers (31 men and 31 women, mean age 64.85 ± 1.98 years, mean time of edentulism 12.17 ± 3.21 years) via face‑to‑face interviews. Cronbach’s alpha coefficient was used to measure internal consistency. Construct validity was analyzed using exploratory factor analysis. The Spearman’s correlation coefficient between the summary scores of the tool and the years of edentulism and sex was also calculated for concurrent validity ( = 0.05).
It has been found that the Persian version of the questionnaire had an acceptable reliability ( = 0.910). Exploratory factor analysis extracted five domains: Masticatory problems with dentures, problems while consuming apple and carrot, meat products, fruits and vegetables, and changes need for better swallowing. A correlation was found between the tool scores and the years of edentulism (P = 0.001), but there was no correlation between sex and the tool scores (P = 0.841).
The Persian version of QMF questionnaire for edentulous patients showed acceptable validity and reliability but further studies are needed to verify this tool.

Different Candida species, especially Candida albicans have been known as part of human oral cavity normal flora. Changes in the oral environment resulting from tooth loss or denture application can affect oral micro-flora. The general purpose of the current study was to determine Candida species occurrence rate in the oral cavity of denture wearer patients in comparison with those without denture. A total 30 edentulous elderly with complete removable denture and 30 dentulous elderly people, who had been admitted for non-prosthetic treatments, were randomly selected in Yazd dentistry department. Their oral rinse samples were collected for mycological examination, and cultured on CHROMagar Candida plates. Frequency and density of Candida species isolated from both groups were compared using SPSS software with T-test, and differences were considered significant at p<0.05. Oral Candida species were isolated from 63.3% of edentulous people with dentures in comparison with 33.3% dentulous elderly persons (p=0.001). Non-albicans Candida species were isolated more frequently in denture wearers compared with the dentulous group (p=0.03). There was no significant difference between both groups in case of Candida albicans isolation (p=0.09). The findings of the current study show that long-term use of dentures in edentulous denture users can result in a wide Candida species colonization, causing denture stomatitis.

Assessment of the lateral wall thickness of the maxillary sinus is very important in decision making for many surgical interventions. The association between the thickness of the lateral wall of the maxillary sinus and the dental status is not well identified.. To compare the thickness of the lateral wall of the maxillary sinus in individuals with and without teeth to determine if extraction of the teeth can lead to a significant reduction in the thickness of the maxillary sinus lateral wall or not..Patients and In a retrospective study on fifty patients with an edentulous space, the thickness of the lateral wall of the maxillary sinus,one centimeter above the sinus floor in the second premolar (P2), first molar (M1) and second molar (M2) areas was determined by cone beam computed tomography scans(CBCTs) and a digital ruler in Romexis F software (Planmeca Romexis 2.4.2.R) and it was compared with values measured in fifty dentated individuals. Three way analysis of variance was applied for comparison after confirmation of the normal distribution of data.. The mean of the wall thickness in each of these points was lower in patients with edentulous spaces; however it was not significant. There was no association between gender and the thickness of the lateral wall of the maxillary sinus, but location was associated with different thicknesses.. The differences in the thickness based on the location and dental status necessitates assessment of the wall thickness of the maxillary sinus in addition to the current evaluation of bone thickness between the sinus floor and the edentulous crest before maxillary sinus surgery..

Assessment of the lateral wall thickness of the maxillary sinus is very important in decision making for many surgical interventions. The association between the thickness of the lateral wall of the maxillary sinus and the dental status is not well identified.. To compare the thickness of the lateral wall of the maxillary sinus in individuals with and without teeth to determine if extraction of the teeth can lead to a significant reduction in the thickness of the maxillary sinus lateral wall or not..Patients and In a retrospective study on fifty patients with an edentulous space, the thickness of the lateral wall of the maxillary sinus,one centimeter above the sinus floor in the second premolar (P2), first molar (M1) and second molar (M2) areas was determined by cone beam computed tomography scans(CBCTs) and a digital ruler in Romexis F software (Planmeca Romexis 2.4.2.R) and it was compared with values measured in fifty dentated individuals. Three way analysis of variance was applied for comparison after confirmation of the normal distribution of data.. The mean of the wall thickness in each of these points was lower in patients with edentulous spaces; however it was not significant. There was no association between gender and the thickness of the lateral wall of the maxillary sinus, but location was associated with different thicknesses.. The differences in the thickness based on the location and dental status necessitates assessment of the wall thickness of the maxillary sinus in addition to the current evaluation of bone thickness between the sinus floor and the edentulous crest before maxillary sinus surgery..

Denture cleansing is a key element in retaining mucosa free of any inflammation. However, many denture users usually ignore this important factor. This investigation was designed to compare the efficacy of a denture brush and an ordinary brush in cleansing process of complete dentures. A group of 31 individuals aged 44-76 years were included in this study. Each patient was then instructed to use the denture brush for a period of 4 weeks while an ordinary brush was to be used for the following 4 weeks. Dentures were photographed and evaluated at every two week intervals using a computer photographic software assessment method. Pictures were compared using the image tool for plaque remaining on the denture surfaces. Student t-test was used to analyse data collected. Comparison of the brush type efficacy at 2 and 4 weeks did not show any significant difference (P>0.05), however, clinical evaluation indicated that denture brush leaves much less plaque bio-film compare to the ordinary one, with mean plaque traced at 6.88 to 9.24 in 4 weeks. There were no significant differences found between the two brushes’ efficacy, with clinical evaluation significantly in favor of denture brush.