Conventional Versus Implant-Retained Overlay Dentures: A Pilot Study of Masseter and Anterior Temporalis Electromyography

2014 ◽  
Vol 40 (4) ◽  
pp. 418-424 ◽  
Author(s):  
Mansour Dakhilalian ◽  
Mansour Rismanchian ◽  
Akbar Fazel ◽  
Keyvan Basiri ◽  
Hamid Azadeh ◽  
...  
Keyword(s):  
Masticatory Muscles ◽  
Complete Dentures ◽  
Gum Chewing ◽  
Wave Range ◽  
Left And Right ◽  
The Mean ◽  
Edentulous Patients ◽  
The Right ◽  
Cotton Roll ◽  
Masseter Muscles

Implant-supported overlay dentures (ISODs) have been widely accepted among patients using conventional removable complete dentures (CRCDs). The present study aimed to comparatively study conventional and ISODs in terms of function and coordination of masticatory muscles using electromyograms. Included were 10 patients with ISODs (each with 2 implants in the intercanine area). The mean wave range (MWR) and frequency (MWF) of masseter and temporalis were recorded with (ISOD) and without (CRCD) ball attachments while maximum clenching on cotton rolls (cotton roll clenching), maximum intercuspal clenching (clenching), and unilateral gum chewing (chewing) using electromyography. Data were analyzed in SPAW using t-paired for matched groups and independent-sample t tests for unmatched ones. The MWF differences were not statistically significant with or without attachments (P > .05). Without attachments in place, the MWF of both masseter and temporalis muscles significantly decreased when patients clenched on cotton rolls (P = .01 and .02, respectively) and when chewing unilaterally (both P = .01). With attachments present, the right and left temporalis muscles did not show identical mean wave ranges while chewing (P = .01). Without attachments, this disharmony was seen in the left and right masseter muscles (P = .03). The MWR of masseter was higher in men while chewing with attachments (P = .02). Without attachments, the MWR of temporalis was higher in women while cotton roll clenching (P = .03) and chewing (P = .02). These findings are seemingly in favor of improved masticatory function and coordination in edentulous patients with the application of ISODs.

scholarly journals Masticatory muscle Activity in Individuals with Temporomandibular Disorder

2021 ◽  
Vol 64 (3) ◽  
pp. 179-182
Author(s):  
Lyubov V. Smaglyuk ◽  
Anastasiia V. Liakhovska
Keyword(s):  
Muscle Activity ◽  
Clinical Symptoms ◽  
Temporomandibular Disorder ◽  
Normal Activity ◽  
Masticatory Muscles ◽  
Emg Activity ◽  
Muscle Work ◽  
Left And Right ◽  
The Right ◽  
Masseter Muscles

Aim: The aim of our study was to investigate features related to EMG-activity of masticatory muscles in subjects with TMD. materials and methods: The study comprised 22 patients with clinical symptoms of TMD. The average age of the subjects was 29.3 ± 4.4 years. Malocclusion was evaluated according to Angle classification, TMD – according to the Research Diagnostic Criteria (RDC/TMD). Registration of EMG-activity of masseter and anterior temporalis muscles was performed during maximum voluntary clenching, clenching on the right and left sides. Results: Normal activity of the masticatory muscles is characterized by symmetrical and EMG-activity of the masticatory muscles on the left and right sides. EMG-activity of masticatory muscles in subjects with TMD are characterized by: 1) increased values of EMG-activity of temporal and masseter muscles; 2) disproportional and asymmetric muscle work of the masticatory muscles on the right and left sides. Conclusions: Features of masticatory muscles activity in individuals with Angle Class I malocclusion and TMD were found.

scholarly journals Experience of using an integrated approach in the diagnosis of temporomandibular joint dysfunction

2022 ◽  
pp. 98-100
Author(s):  
A. A. Sultanov ◽  
Y. Y. Pervov ◽  
A. K. Yatsenko ◽  
M. A. Sultanova ◽  
D. O. Drozdova
Keyword(s):  
Physical Examination ◽  
Temporomandibular Joint ◽  
Orthodontic Treatment ◽  
Clinical Case ◽  
Mouth Opening ◽  
Integrated Approach ◽  
Masticatory Muscles ◽  
Temporomandibular Joint Dysfunction ◽  
The Right ◽  
Masseter Muscles

The article presents a clinical case of the diagnostics and treatment of the temporomandibular joint dysfunction (TMJ) in patient after orthodontic treatment. The hypertonia of masticatory muscles, limit of mouth opening and deviation of the jawbone to the right were observed during physical examination. Adhesion of the disk to the articular tubercle of the right temporal bone was detected on MRI. Hyperrotation of the articular head and the deviation of the jawbone to the right were observed on the charts during axiography. Disappearing of the feeling of heaviness in the right TMJ, free mouth opening, absence of deviation symptom, and the reduction of the rigidity of the masseter muscles were observed on the basis of diagnostic examinations after treatment. Presented clinical experience lets us make a conclusion that it is necessary to prescribe taking axiography and MRI during diagnosing and treating temporomandibular joint dysfunction.

scholarly journals A Comparative study to measure the horizontal condylar guidance obtained by protrusive interocclusal records and panoramic radiographic images in completely edentulous patients

2018 ◽  
Vol 14 (1) ◽  
pp. 21-27
Author(s):  
Arjun Bhandari ◽  
Archana Manandhar ◽  
Raj Kumar Singh ◽  
Pramita Suwal ◽  
Prakash Kumar Parajuli
Keyword(s):  
Zinc Oxide ◽  
Horizontal Plane ◽  
Significant Positive Correlation ◽  
Panoramic Radiograph ◽  
Articular Eminence ◽  
Radiographic Images ◽  
The Mean ◽  
Edentulous Patients ◽  
The Right ◽  
Interocclusal Records

Background & Objectives:The study was conducted with objective to compare the horizontal condylar guidance (HCG) obtained by protrusive interocclusal records and panoramic radiographic images in completely edentulous patients.Materials & Methods:The horizontal condylar guidance was measured in 25 completely edentulous patients by protrusive interocclusal records using zinc oxide eugenol paste through a face bow transfer (HanauTM Spring bow, Whip Mix Corporation, USA) to a semi-adjustable articulator (HanauTM Wide-Vue Articulator, Whip Mix Corporation, USA).  In the same patients, HCG was traced in the panoramic radiograph. The angles formed by the intersection of two lines: Frankfurt’s horizontal plane and posterior slope of articular eminence was measured using protractor to represent the horizontal condylar guidance angle on each side.Results:The mean difference between the horizontal condylar guidance angles values obtained using protrusive interocclusal record and panoramic radiograph was 2.68 degrees and 3.40 degrees for the right and the left side respectively, with the panoramic radiograph values being higher. This difference between the values was found to be highly significant between the two methods for the right side (t = 2.70, p = 0.012) and left side (t = 3.69, p = 0.001). A significant positive correlation was found between the horizontal condylar guidance obtained from protrusive interocclusal record and panoramic radiograph for the right (r = 0.643, p = 0.001) and left sides (r = 0.622, p = 0.001) separately.Conclusion:The panoramic radiographic tracing can be used to calculate the mean horizontal condylar guidance in the completely edentulous patients and these values can be used to programme semi-adjustable articulators avoiding the cumbersome process of obtaining protrusive interocclusal records.

Postnatal Development of a Left-Right Atrial Pressure Gradient

1956 ◽  
Vol 186 (3) ◽  
pp. 521-524 ◽  
Author(s):  
A. van Harreveld ◽  
F. E. Russell
Keyword(s):  
Left Ventricle ◽  
Pressure Gradient ◽  
Left Atrium ◽  
Postnatal Development ◽  
Right Atrial ◽  
Left And Right ◽  
The Mean ◽  
The Right ◽  
The Relationship ◽  
Equal Thickness

The mean left and right atrial pressures were measured in six groups of 10 kittens each. One group was examined between the 12th and 24th hour after birth, one group after 3 days, after 1 week, 2 weeks, 1 month and 2 months. The left and right atrial pressures were almost equal in the first group. With age an increasing left to right pressure gradient developed. In the oldest group the pressure in the left atrium was almost twice as great as in the right. Parallel with the pressure gradient a difference developed in the wall thicknesses of the left and right ventricles. At birth the ventricular walls were of about equal thickness; at age 2 months the left ventricle wall was more than twice as thick as the right. The relationship between ventricle wall thicknesses and atrial pressures is discussed.

scholarly journals Growth-Related Differences in Maximum Laterotrusion and Retrusion between Children and Adults

2009 ◽  
Vol 79 (2) ◽  
pp. 265-270 ◽  
Author(s):  
Claudia A. Reicheneder ◽  
Peter Proff ◽  
Uwe Baumert ◽  
Tomas Gedrange
Keyword(s):  
Temporomandibular Joint ◽  
Null Hypothesis ◽  
Population Based ◽  
Adult Group ◽  
Population Based Study ◽  
Significant Difference ◽  
Left And Right ◽  
The Mean ◽  
The Right

Abstract Objective: To test the null hypothesis that there are no differences between children and adults in maximum laterotrusion and maximum retrusion on the right and left sides. Materials and Methods: This population-based study included 81 randomly selected children between the ages of 6 and 10 years and 67 adults. Kinematic variables were measured with the ultrasonic JMA-System for registration. Results: The mean maximum laterotrusion of the children's group (10.6 ± 1.5 mm on the left, 11.0 ± 1.7 mm on the right) was significantly smaller than that of the adult group (11.7 ± 2.0 mm on the left, 12.2 ± 1.7 mm on the right). The maximum laterotrusion of the children's group corresponded to about 90% on the left and right sides of that of the adult group. The mean maximum retrusion of the children's group was significantly bigger than that of the adult group. There, the adult values corresponded to 66.7% on the left and 50% on the right side of the children's values. No significant difference in maximum laterotrusion and retrusion was noted on the right and left sides, and no significant differences according to gender specificities were observed in either group. Conclusions: The hypothesis is rejected. In development of the temporomandibular joint, maximum laterotrusion on the right and left sides increases significantly with age, and maximum retrusion decreases significantly with age.

scholarly journals Evaluation of Maximum Biting Force in Two Different Attachment Systems (Bollard vs. Ball and Socket) Retaining Mandibular Overdenture: A Split-mouth Design

2021 ◽  
Vol 9 (D) ◽  
pp. 47-53
Author(s):  
Reham Tharwat Kamal Elbeheiry ◽  
Gehan F. Mohamed ◽  
Amr Mohamed Ismail Badr
Keyword(s):  
Surgical Technique ◽  
Acrylic Resin ◽  
The Other ◽  
Complete Dentures ◽  
Two Stage ◽  
Occlusal Force ◽  
Edentulous Patients ◽  
The Right ◽  
Mandibular Overdenture

AIM: The study was conducted to evaluate maximum biting force (MBF) in two different attachment systems (bollard a vs. ball and socket attachment) retaining mandibular overdenture using a split-mouth design. SUBJECTS AND METHODS: Twelve completely edentulous patients received complete dentures and after adaption of the patient with the new denture, 24 implants were inserted in the canine region using two-stage surgical technique and conventional loading protocol. Six patients received the Bollard attachment at the right side and the Ball and Socket at the left side. Moreover, the other six patients received the bollard attachment at the left side and the ball and socket attachment at the right side. Each patient was treated according to split-mouth design. Insertion of each of the attachment type was assigned randomly. Using occlusal force meter instrument, MBF was measured immediately after loading (0), after 6 months (6), and after 12 months (12). RESULTS: Significant statistical differences (p < 0.05) were obvious in in MBF between Attachment (1) and Attachment (2) immediately after loading (0 months), after 6 months (6) and after 12 months (12) follow-up visits. CONCLUSION: Mandibular implant retained overdenture received Bollard abutment that retained with the denture by the help of resilient liner “Retention.sil”* without housing have higher biting forces than mandibular implant retained overdenture with ball abutment where the plastic house was picked up by monomer free self-cured acrylic resin.

Curvature measurement of human bilateral cochleae

2015 ◽  
Vol 129 (11) ◽  
pp. 1085-1090 ◽  
Author(s):  
J-F Yu ◽  
K-C Lee ◽  
Y-L Wan ◽  
Y-C Peng
Keyword(s):  
Magnetic Resonance Imaging ◽  
Magnetic Resonance ◽  
Cochlear Implantation ◽  
Resonance Imaging ◽  
Basal Turn ◽  
Curvature Measurement ◽  
Left And Right ◽  
The Mean ◽  
Potential Damage ◽  
The Right

AbstractObjective:This study aimed to characterise the geometry of the human bilateral spiral cochlea by measuring curvature and length.Method:Eight subjects were recruited in this study. Magnetic resonance imaging was used to visualise the right and left cochlea. Visualisation of the cochlear spiral was enhanced by T2 weighting and further processing of the raw images. The spirals were divided into three segments: the basal turn, the middle turn and the apex turn. The length and curvature of each segment were non-invasively measured.Results:The mean left and right cochlear lengths were 3.11 cm and 3.95 cm, respectively. The measured lengths of the cochlear spiral are consistent with data in the literature derived from anatomical dissections. Overall, the apex turn segment of the cochlea had the greatest degree of curvature (p < 0.05). The mean apex turn segment curvatures for left and right cochleae were 9.65 cm−1 and 10.09 cm−1, respectively.Conclusion:A detailed description of the cochlear spiral is provided, using measurements of curvature and length. These data will provide a valuable reference in the development of cochlear implantation procedures for minimising the potential damage during implantation.

scholarly journals A Study to Evaluate and Compare Right and Left Condylar Discrepancy between Centric Relation and Maximum Intercuspation in Three Age Groups

2016 ◽  
Vol 5 (1) ◽  
pp. 984
Author(s):  
Chetan Hegde ◽  
Swapnil Mahade ◽  
Krishna Prasad D.
Keyword(s):  
Age Groups ◽  
Orientation Relation ◽  
Group Iii ◽  
Area Of Interest ◽  
Centric Relation ◽  
Group I ◽  
Left And Right ◽  
The Mean ◽  
Group Ii ◽  
The Right

<strong><em>Background</em>:</strong>Since discrepancy between centric relation and maximum intercuspation has been an area of interest for dental fraternity for decades, the study was conducted to expand the concepts of the same when age is taken into consideration.<p><strong>Objective:</strong> This study was conducted to assess and measure the discrepancy between centric relation (CR) and maximum intercuspation (MI) at right and left condyles in three age groups, compare the discrepancy at right and left condyles between three age groups and right and left side condyles within the same age group.</p><p><strong>Methods:</strong> Sixty healthy subjects were selected and divided into three groups of twenty subjects each. Group I: 18-25 years, Group II: 30-45 years and Group III: more than fifty years. Preliminary impressions were made. Orientation relation was transferred to a semi-adjustable arcon articulator. Subjects were guided into centric relation using Dawson's bimanual manipulation technique and centric interocclusal record was made. The mandibular cast was related to the maxillary cast using centric interocclusal record. The casts were then allowed to fall into maximum intercuspation and the distance that the condylar analogues had moved was measured using Feeler gauge.</p><p><strong><em>Results:</em></strong> The mean CR-MI discrepancy in Group I was 0.417±0.137 mm and 0.364±0.123 mm, Group II was 0.528±0.160 mm and 0.512±0.158 mm and Group III was 0.873±0.228 mm and 0.815±0.172 mm at the right and left condyles respectively.</p><p><strong><em>Conclusion:</em></strong> Within the limitations of the study it was concluded that all the sixty subjects had a CR-MI discrepancy in both left and right condyles. The variation in discrepancy between the three age groups was found to be very highly significant.</p>

scholarly journals Post-stroke Visual Impairment Treated with Korean Medical Treatment: A Case Series

2021 ◽  
Vol 42 (5) ◽  
pp. 1035-1044
Author(s):  
Young-ung Lee ◽  
Geonhui Kang ◽  
Kwangho Kim ◽  
Cheol-hyun Kim ◽  
Sunny Kang ◽  
...  
Keyword(s):  
Visual Field ◽  
Herbal Medicine ◽  
Medical Treatment ◽  
Visual Impairment ◽  
Parietal Lobe ◽  
Posterior Cerebral Artery ◽  
Case Series ◽  
Left And Right ◽  
The Mean ◽  
The Right

Objective: This study investigated two cases of Korean medical treatment for visual field impairment after stroke: Case 1, a 56-year-old male with a posterior cerebral artery infarction and right homonymous hemianopsia, and Case 2, a 46-year-old male with an intracerebral hemorrhage in the left parietal lobe and right homonymous hemianopsia.Methods: Case 1 was treated with acupuncture, electroacupuncture, and herbal medicine (Mangeum-tang) for two months, and Case 2 was treated with acupuncture, electroacupuncture, and herbal medicine (Oryeong-san) for 40 days.Results: Following treatment, for Case 1, the Humphrey visual field test showed improvement. The visual field indexes (VFIs) for the left and right eyes improved from 44% to 55% and 49% to 64% respectively, and the mean deviations (MDs) for the left and right eyes improved from -21.11 dB to -19.91 dB and -17.45 dB to -13.89 dB, respectively. The mean visual sensitivities (MVSs) of the left and right eyes also improved from 8.67 dB to 11.33 dB and 1.67 dB to 9.67 dB, respectively, with no side effects. For Case 2, the VFI for the left eye improved from 36% to 64% and that for the right eye remained unchanged. The MDs for the left and right eyes also improved from -22.02 dB to -14.47dB and -22.11 dB to -21.34 dB, respectively, with no side effects.Conclusions: This study suggests that Korean medical treatment may improve visual impairment after stroke, but further research is needed.

scholarly journals COMPARATIVE STUDY OF LUMBAR PLEXUS PATH ON THE LEFT AND RIGHT SIDES THROUGH THE PSOAS MUSCLE

2018 ◽  
Vol 17 (4) ◽  
pp. 262-265
Author(s):  
Emiliano Neves Vialle ◽  
Luiz Roberto Gomes Vialle ◽  
Letícia Cardoso Ern ◽  
Luis Miguel Duchén Rodríguez ◽  
Grover Coaquira Huayta ◽  
...  
Keyword(s):  
Psoas Muscle ◽  
Transverse Process ◽  
Lateral Approach ◽  
Anatomical Landmark ◽  
Wilcoxon Test ◽  
Lumbar Plexus ◽  
Level Of Evidence ◽  
Left And Right ◽  
The Mean ◽  
The Right

ABSTRACT Objective: Spine surgery with a minimally invasive lateral approach and validate possible anatomical differences between the right and left sides. Methods: Four measurements (cm) were taken on 38 cadavers: the distance between the lumbar plexus and the transverse process (L4-L5) and the distance between the lumbar plexus and the midline of the lumbar spine, both on the right and left sides. Results: The mean distance between the lumbar plexus and the transverse process of L4-L5 was 1.03 cm and the distance to the midline was 3.99 cm for the right side. The averages of the left side were 1.13 cm and 3.38 cm, respectively. There is statistical difference between the sides (p<0.05) using the non-parametric Wilcoxon test. Conclusions: The authors suggest that the transverse process might be used as an anatomical landmark to define the surgical approach through the psoas muscle. Level of Evidence IV; Cadaveric study.

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