R. Mosharraf , D. Abtahi , M. Porrabani ,
Volume 16, Issue 4 (1-2004)
Abstract
Statement of Problem:The determination of the dental midline is necessary in most dental procedures.One of the methods to fulfill this goal is to determine the facial midline based on the midpoints of the forehead, nose, upper lip and chin. However, for various reasons, this method has not always been proved successful. In such cases, different techniques, based on the investigations in the edentulous
patients, have been suggested.
Purpose: The aim of this study was to investigate the conformity of some landmarks such as labial frenum, incisive papilla and mid palatal suture with dental and facial midlines among people with natural dentition in order to obtain accurate anatomic landmarks for denture replacement.
Materials and Methods: In this descriptive study, 96 dental students, having all their permanent teeth and without any orthognathic problem, were chosen. For each subject, Alginate impressions and dental casts were prepared. Then, centric occlusion was recorded with a biting wax and the facial mid line was determined on the anterior part of it. The distances from the facial midline to the upper teeth midline,
incisive papilla, labial frenum and mid palatal suture were determined with a special tool and were measured by a VERNIEH two times. In order to analyze the results, Chi- Square and t-student tests were used.
Results: The average of facial midline distance to the upper teeth midline, the labial frenum, the incisive papilla and the mid palatal suture were 0.83±0.60, 0.67±G.54, 0.83±00.63 and 0.81±0.62 mm,respectively. There was no significant difference between males and females. Labial frenum showed the minimum distance to the facial midline, while the incisive papilla had the maximum. There was no significant difference between these anatomic landmarks, in conformity or unconformity with the facial midline
Conclusion: Considering the low percentage of the subjects with complete conformity and the lack of significant differences between these three landmarks, it is suggested that there is no superiority among these landmarks for the determination of facial midline. The similar distances from the facial midline to the incisive papilla and upper teeth midline indicate that using incisive papilla to determine the upper
teeth midline in edentulous patients lead to normal face.
E. Moslehifard, Sh. Safaeian,
Volume 24, Issue 2 (4-2011)
Abstract
Fabrication of dental prosthesis for patients with microstomia has long been a problem for dentists. Microstomia is defined as an abnormally small oral orifice. Prosthetic rehabilitation of microstomia patients presents difficulties at all stages, from the preliminary impressions to fabrication of prosthesis. This study described a method for making impressions for patients with limited opening of the oral cavity which the use of a full-size impression tray was not possible.
Bahram Kouhnavard, Hosseinali Mahgoli, Somayeh Bolghanabadi, Mohsen Yazdan Aval, Maryam Rostami Aghdam Shendi, Malihe Kolahdouzi,
Volume 31, Issue 2 (9-2018)
Abstract
Background and Aims: Making dental prostheses is sensitive and accurate work and requires powerful and skilled hands. Because of this, the dental prosthesis technicians may suffer harmful effects such as stress and fatigue during the course. The aim of this study was to investigate fatigue, stress and job performance and their relationship with some demographic variables in this community.
Materials and Methods: The present study was cross-sectional and done in 2016. The study population was a group of dental prosthesis technicians that had participated in a national congress in Tehran. Sampling was done by census Two standardized questionnaires on the subjects of fatigue and stress which were distributed among 100 female and male participants and sampling was done by census. Then, the obtained data was analyzed using SPSS16 software and applying descriptive statistics, Pearson correlation test, and ANOVA, T-test.
Results: From the 100 samples, there were 16 females and 84 males with mean age 34.71±7.90 and average work experience of 10.82± 9.01 years. 82 percent of the subjects were married and 42 percent of them were smokers. The results showed that 100 percent of dental prostheses technicians were facing with moderate to severe stresses. The stress and fatigue scores in married ones were higher than the single ones. The results showed a significant relationship between smoking, stress, and fatigue scores (P<0.05).
Conclusion: According to the high level of job stress in the dental prostheses technicians, this problem must be considered, minimized, and more attention should be paid to their psychological and emotional problems.
