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Contemporary Clinical Dentistry 2019This case report highlights a case of full-mouth rehabilitation in a 38-year-old female. Extrusion of the right posterior maxillary alveolar segment had resulted due to...
This case report highlights a case of full-mouth rehabilitation in a 38-year-old female. Extrusion of the right posterior maxillary alveolar segment had resulted due to the presence of an opposing edentulous mandibular span, which had led to complete absence of restorative space in the lower arch. Maxillary posterior segmental osteotomy was carried out to obtain adequate space for placing an implant-supported prosthesis in the opposing edentulous mandibular span. The procedures before the surgery consisted of articulation of the diagnostic casts on to a semi-adjustable Hanau™ Wide-Vue articulator and a mock surgery on the upper cast to assess the amount of segmental osteotomy necessary to accommodate an implant-supported prosthesis in the lower edentulous region. Other procedures included implant placements, root canal treatment, post and core build-up, and full-crown placement on various teeth.
PubMed: 32015663
DOI: 10.4103/ccd.ccd_487_18 -
Contemporary Clinical Dentistry 2018This study was done to determine the level and type of microbial contamination present on the surface of various dental laboratory equipment and laboratory attire and to...
CONTEXT
This study was done to determine the level and type of microbial contamination present on the surface of various dental laboratory equipment and laboratory attire and to determine the antibiotic susceptibility pattern of these isolated pathogens.
SUBJECTS AND METHODS
The samples were divided into following groups: six groups of dental laboratory equipment (articulators, facebow, fox plane, polishing buff, micromotor handpiece, and surveyors) and dental attire of laboratory technicians and students. A total of 33 swabs were collected from each dental laboratory equipment, namely, articulators, facebow, fox plane, polishing buff, micromotor handpiece, and surveyors. The dental laboratory attire of students and dental technicians were analyzed separately. The swabs were collected from the laboratory attire at the end of the week, and they were washed once a week and at the beginning of the week. The groups are Group 1 - dental laboratory attire (students), Group 2 - dental laboratory attire (technicians), Group 3 - polishing buff, Group 4 - facebow, Group 5 - surveyor, Group 6 - fox plane, Group 7 - articulator, and Group 8 - micromotor handpiece. The moistened swabs were inoculated into the broth and subcultured on to the MacConkey Agar plates, and then incubated aerobically at 37°C for 24 h. The organisms were identified based on colony morphology, Gram staining, and standard biochemical tests. The antibiotic susceptibility patterns of the isolated organisms were done according to the CLSI guidelines. The collected data were statistically analyzed.
STATISTICAL ANALYSIS USED
The data collected were entered into a Microsoft Excel Spreadsheet and analyzed using IBM SPSS Statistics, Version 22 (Armonk, NY, IBM Corp.). The frequency and mean standard deviation of the samples were analyzed using Fisher's exact value test. Percentage of resistance among the isolates to different antimicrobials was also determined.
RESULTS
The microorganisms isolated were , coagulase-negative , nonfermenting Gram-negative bacteria, and species. The mean microbial levels in dental laboratory attire were more (5 log colony-forming units [CFU]) compared with dental equipment (3 log CFU-4 log CFU). Furthermore, most of the isolated organisms showed increased antimicrobial resistance.
CONCLUSION
Majority of the isolated organisms were not a part of the normal oral microflora and are capable of causing various diseases. The increased resistance to the antimicrobials showed by the isolated organisms proves that there are increased chances of multiresistant organisms to occur in the future.
PubMed: 31772472
DOI: 10.4103/ccd.ccd_569_18 -
Acta Stomatologica Croatica Sep 2019Programming of joint mechanism/parameters (sagittal condylar inclination and Bennett angle) of adjustable dental articulators is a prerequisite for performing positions...
OBJECTIVES
Programming of joint mechanism/parameters (sagittal condylar inclination and Bennett angle) of adjustable dental articulators is a prerequisite for performing positions and movements of the mandible. The aim of the study was to test significant differences between the two methods (wax eccentric records and Arcus Digma device) of measuring these joint parameters by using three different dental articulators (SAM 3, Protar 7; and Artex CR).
MATERIALS AND METHODS
Thirty asymptomatic younger (age 25.7 ± 2.9 years) subjects (dental medicine students) divided by gender, with normal occlusion (Angle class I) participated in the study. After taking anatomical impressions of both dental arches, master casts were made of hard dental plaster for each subject. The values of the left and right sagittal condylar inclination and Bennett angle by the two methods of wax eccentric protrusive and lateral records and Arcus Digma device were measured for the purpose of programming the mentioned joint parameters in three different articulator systems.
RESULTS
The average values of the measured parameters of sagittal condylar inclination and Bennett angle of wax eccentric records were higher (ranging from 5ºto 10º) in relation to the values measured by Arcus Digma device. Statistically significant differences found between the measured joint parameters (p <0.025) were influenced by the articulator system design and measurement methods (t-test for dependent samples and MANOVA).
CONCLUSION
The use of Arcus Digma device should be considered reliable and valid for individualized programming of dental articulators, rather than the use of wax eccentric records.
PubMed: 31749453
DOI: 10.15644/asc53/3/3 -
Journal of Maxillofacial and Oral... Dec 2019In orthognathic surgery, we often experience that model mounting by the occlusal bite record taken at centric relation under the conscious condition in the sitting...
INTRODUCTION
In orthognathic surgery, we often experience that model mounting by the occlusal bite record taken at centric relation under the conscious condition in the sitting position does not always correctly replicate the actual maxilla-mandibular relationship under general anesthesia. Mandible often moves backward further in the latter condition. The present study was carried out to investigate the degree of extra retrusion of the mandible under general anesthesia and to determine the characteristics in each of the three original skeletal class patterns in a Japanese population.
PATIENTS AND METHODS
Fifty patients with jaw deformities (14 males and 36 females) were enrolled in this prospective study, their ages ranging from 16 to 49 years. The occlusal bite record at the incisor region obtained from a mounted articulator was compared with the records from the oral cavity of the patient under general anesthesia before surgery.
RESULTS
Retrusion in the supine position under general anesthesia was observed in all skeletal classes, and it was significantly greater in skeletal Class II, compared to skeletal Class I and Class III.
CONCLUSION
This study clearly revealed the difference among three different skeletal classes, and the mandible in the skeletal Class II moved backward significantly compared to other classes.
PubMed: 31624452
DOI: 10.1007/s12663-019-01199-9 -
Journal of Indian Prosthodontic Society 2019The aim of the study was to compare two radiographic techniques, orthopantomograph (OPG), and cone-beam computed tomography (CBCT) in determining the sagittal condylar...
Comparative evaluation of condylar inclination in dentulous subjects as determined by two radiographic methods: Orthopantomograph and cone-beam computed tomography - An study.
AIM
The aim of the study was to compare two radiographic techniques, orthopantomograph (OPG), and cone-beam computed tomography (CBCT) in determining the sagittal condylar guidance (SCG) and to find out if CBCT can serve as an alternative aid to program semi-adjustable and fully adjustable articulators.
MATERIALS AND METHODS
Following the inclusion and exclusion criteria, 40 individuals (20 males and 20 females) aged between 20 and 40 years were selected. An OPG and a CBCT radiograph were obtained for each individual. Using appropriate software, the SCG was measured for both the sides, for both the radiographic methods. The values for each individual were obtained by two investigators for both the methods using the respective software and the average value was taken. After performing the Shapiro-Wilk test, paired -test was used to compare the mean difference pairwise (for both right and left side) while -test was used to compare the mean difference between two groups.
RESULTS
Results showed that the right and left SCG values obtained from both, OPG and CBCT methods were comparable and there were no significant differences. Statistically significant difference was not found between the left and ride side condylar inclination values for both the sex obtained from both the methods. With increasing age, condylar inclination values obtained from both the radiographic methods tend to decrease. The values for SCG obtained from both the methods (CBCT and OPG) are thus comparable and correlated.
CONCLUSION
The values for SCG obtained from both the methods (CBCT and OPG) are comparable and correlated. Thus, CBCT being a better radiographic technique can be used for obtaining the condylar inclination for programming the semi-adjustable and fully adjustable dental articulators.
PubMed: 31040544
DOI: 10.4103/jips.jips_266_18 -
Psychonomic Bulletin & Review Aug 2019The relationship between speech perception and production is central to understanding language processing, yet remains under debate, particularly in early development....
The relationship between speech perception and production is central to understanding language processing, yet remains under debate, particularly in early development. Recent research suggests that in infants aged 6 months, when the native phonological system is still being established, sensorimotor information from the articulators influences speech perception: The placement of a teething toy restricting tongue-tip movements interfered with infants' discrimination of a non-native contrast, /Da/-/da/, that involves tongue-tip movement. This effect was selective: A different teething toy that prevented lip closure but not tongue-tip movement did not disrupt discrimination. We conducted two sets of studies to replicate and extend these findings. Experiments 1 and 2 replicated the study by Bruderer et al. (Proceedings of the National Academy of Sciences of the United States of America, 112 (44), 13531-13536, 2015), but with synthesized auditory stimuli. Infants discriminated the non-native contrast (dental /da/ - retroflex /Da/) (Experiment 1), but showed no evidence of discrimination when the tongue-tip movement was prevented with a teething toy (Experiment 2). Experiments 3 and 4 extended this work to a native phonetic contrast (bilabial /ba/ - dental /da/). Infants discriminated the distinction with no teething toy present (Experiment 3), but when they were given a teething toy that interfered only with lip closure, a movement involved in the production of /ba/, discrimination was disrupted (Experiment 4). Importantly, this was the same teething toy that did not interfere with discrimination of /da/-/Da/ in Bruderer et al. (2015). These findings reveal specificity in the relation between sensorimotor and perceptual processes in pre-babbling infants, and show generalizability to a second phonetic contrast.
Topics: Feedback, Sensory; Female; Humans; Infant; Language Development; Male; Movement; Phonetics; Speech Perception; Tongue
PubMed: 31037603
DOI: 10.3758/s13423-019-01601-0 -
Journal of Oral Rehabilitation May 2019Some occlusal detection products are designed for use on dry teeth, but this is not always achieved. Others are suited for dry and wet applications.
BACKGROUND
Some occlusal detection products are designed for use on dry teeth, but this is not always achieved. Others are suited for dry and wet applications.
OBJECTIVE
The objective of this study is to assess the combined effects, on occlusal contact forces, of two previously studied affecting variables-occlusal detection products and saliva.
METHODS
We used a full-arch dentiform with three occlusal detection products (an articulating film, an articulation paper and T-Scan) in combination with human (HS) and an artificial saliva. The maxillary arch assembly, weighing ~54 N (the maximum bite force), was lowered onto (occlusion) and lifted off (disclusion) of the mandibular arch through 10 cycles by a mechanical testing machine. The forces and moments acting on the mandibular arch were continuously recorded by a load cell that supported it.
RESULTS
The maximum values of F (the in-occlusal plane component of the occlusal contact force) were analysed by occlusion/disclusion separately using one-way ANOVA, with factor for group type to identify the significant effect of salivas on products, effect of products, effect of salivas with products, effect of human saliva. A difference in occlusion and/or in disclusion was considered different. Statistical differences (P < 0.0001) in F were found in: dry product vs product + HS, dry product vs product + artificial saliva (with articulating film and T-Scan) and HS vs product + HS (with articulation paper and T-Scan).
CONCLUSION
All products were affected by the salivas, except articulation paper by artificial saliva.
Topics: Analysis of Variance; Biomechanical Phenomena; Bite Force; Dental Articulators; Dental Stress Analysis; Humans; Jaw Relation Record; Models, Dental; Reproducibility of Results; Saliva; Stress, Mechanical; Surface Properties
PubMed: 30702766
DOI: 10.1111/joor.12772 -
Journal of Prosthodontics : Official... Mar 2019Mounting casts accurately on an articulator is a prerequisite for the treatment planning/execution of complex dental cases that require occlusal rehabilitation. A full...
Mounting casts accurately on an articulator is a prerequisite for the treatment planning/execution of complex dental cases that require occlusal rehabilitation. A full digital approach to transfer the position of maxillary dentition to a virtual articulator, by using intraoral scans and cone beam computed tomography (CBCT) files is presented. This technique offers reduced chairside time and the flexibility of choosing the orientation plane. It can be used in orthognathic surgeries, complex interdisciplinary treatments requiring a CBCT scan with a large field of view, or treatments that already have the head CT or CBCT scans from previous diagnosis/treatment.
Topics: Cone-Beam Computed Tomography; Dental Articulators; Imaging, Three-Dimensional; Maxilla; Models, Dental; Patient Care Planning
PubMed: 30663165
DOI: 10.1111/jopr.13023 -
Indian Journal of Dental Research :... 2018The construction of a dental prosthesis needs the duplication of intermaxillary relationships of the patient on the articulator. This procedure is normally fulfilled...
CONTEXT
The construction of a dental prosthesis needs the duplication of intermaxillary relationships of the patient on the articulator. This procedure is normally fulfilled using interocclusal records to program the articulator according to the patient's condylar inclinations. Wax is a popular recording material used for this purpose but has proven to suffer from inaccuracies due to its dimensional variation over time.
AIMS
This study intends to test the reproducibility of eccentric interocclusal wax records over time.
SETTING AND DESIGN
Thirteen dental students aged between 18 and 30 years participated in this study. Maxillary and mandibular casts of the participants were mounted on two types of articulators; wax lateral and protrusive interocclusal records were used to program these articulators.
SUBJECTS AND METHODS
Horizontal and lateral condylar inclinations were obtained for each participant. The interocclusal records were stored for 10 days and the casts of each participant were remounted on the articulators. The interocclusal records were reused to obtain new condylar inclinations of each participant. The initial and the delayed condylar inclinations were compared to evaluate the impact of storage time on wax records.
STATISTICAL ANALYSIS USED
Paired Student's t-test was used for this comparison.
RESULTS
No significant difference (0.38 < P < 0.92) was found between initial and delayed condylar inclinations for both articulators. An interclass correlation coefficient analysis was used to test the reproducibility of measures, and the correlation was significantly elevated (intraclass correlation coefficient >0.600).
CONCLUSIONS
The use of wax interocclusal records for articulator programing was shown to be acceptable even with delayed intervals, without concerns of possible variations of condylar settings due to storage time.
Topics: Adolescent; Adult; Dental Articulators; Dental Occlusion; Dental Prosthesis; Female; Humans; Jaw Relation Record; Male; Mandibular Condyle; Reproducibility of Results; Time Factors; Waxes; Young Adult
PubMed: 30589004
DOI: 10.4103/ijdr.IJDR_695_16 -
Dental Research Journal 2018Setting of condylar inclination is inaccurate in nonarcon articulators because of alteration of the angle between the upper member and condylar track. This article...
BACKGROUND
Setting of condylar inclination is inaccurate in nonarcon articulators because of alteration of the angle between the upper member and condylar track. This article presents a device which can be attached to a nonarcon articulator to rectify errors related to alterations of maxillary occlusal plane-horizontal condylar guidance relation in nonarcon articulators.
MATERIALS AND METHODS
The device provides tight connection of condylar axis to condylar track by mechanical interdigitation of fragments which are placed on condylar axis and condylar track. Condylar track rotates coordinated with condylar axis. Fragments consist of medial fragments placed on medial surface of articular fossa analogs, lateral fragments placed on lateral surface of articular fossa analogs, and condylar axis fragments placed on condylar axis. The device can be used during condylar inclination adjustment by interocclusal records, changing vertical dimension of occlusion, and occlusal adjustment of restorations. Initial evaluation of the device was performed during an opening hinge movement in a single experiment. The angle between condylar track and the upper member of the articulator was determined by calculation before and after applying hinge movement and with and without the device.
RESULTS
When the device was not used, the postexperimental condylar inclination was 7.31° higher than preexperimental value. Using the device, discrepancy reached 2.17°.
CONCLUSION
Using this device may lead to more accurate condylar inclination adjustment which is followed by more accurate prosthetic teeth.
PubMed: 30233650
DOI: No ID Found