[Centric relation and centric occlusion in artificial dentures].
Explore the source record for details and available documents.
Dental Occlusion, Centric↗
SEARCH · Search PubMed
Results for “Centric Relation”
Search indexed PubMed citations on genomics, clinical trials, systematic reviews and public health. Explore titles, authors and supplied subject terms, then open the PubMed record.
Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.
Variability of passively recorded centric relation.
1. Centric relation in patients without clinical signs or symptoms of mandibular dysfunction is a small range of mandibular positions. 2. The average range of shift was 0.302 mm mediolaterally and 0.278 mm anteroposteriorly for all five subjects. 3. There is no significant difference between the ranges of mandibular positions recorded using chin-point guidance, chin-point guidance with ramus support, or bimanual manipulation. 4. This technique of comparing mandibular positions dictated by centric relation records is sufficiently sensitive to reveal minimum ranges of biologic variation.
Chin↗
[The centric relation. IV. Variations in condylar positions according to the methods of measuring centric relation and to the patient's clinical type].
When recording and transferring centric relation onto an articulator errors can be minimized by proper use of dental materials. Remaining errors may be due to either the patient or the clinician. 3 recording techniques (Lucia, Dawson, Ramfjord) are being tested by 2 operators on 12 patients. In order to get a proper centric relation one must not rely upon a technique of taking it but rather on an adequate clinical evaluation of the TMJ at that moment. The role of inadequate intermaxillary relationship upon painful TMJ syndroms cannot be underestimate.
Adult↗
A comparison of centric relation with maximum intercuspation based on quantitative electromyography.
The study concerned the nature of the alterations, if any, in muscle activity demonstrable when the mandible shifts from maximum intercuspation into its most retruded physiological relation (i.e. centric relation). An integrator-averager was used to determine micro V average amplitude from masseter and temporal muscles in two maxillo-mandibular positions, centric relation and maximum intercuspation, and three modes, first contact occlusion, chewing and swallowing. Vertical reference marks on the cuspids were used to quantitate horizontal deviation from maximum intercuspation to centric relation. Data were obtained from twelve subjects and analysed for variance. Results demonstrated a significant increase in micro V in all centric relation positions. Statistics yielded an F value of 5.88258 with a probability of 0.005. Results suggest critical limitations in reliance on centric relation as a reference position during clinical therapy.
Adult↗
[Maxillomandibular relations in complete dentures: mounting of teeth in centric relation, centric occlusion or in eccentric occlusion].
Explore the source record for details and available documents.
Adult↗
Centrically related casts. Part 1: a two-step method for recording centric relation.
Explore the source record for details and available documents.
Dental Impression Materials↗
The swallowing position as a centric relation record.
A brief review of the swallowing position and its relation to centric relation records was presented. Intraoral tracings of the swallowing position for six patients were made at the natural occlusal vertical dimension. Deviations of the position from the IP were measured. The swallowing position deviated anteroposteriorly and laterally from the IP, and this raises questions as to the validity of this method for recording centric relation.
Deglutition↗
Comparing condylar position repeatability for standardized versus nonstandardized methods of achieving centric relation.
STATEMENT OF PROBLEM: Centric relation has often been mentioned as a repeatable condylar position. PURPOSE OF STUDY: This study was designed to determine whether a standardized method of achieving centric relation would be repeatable within the 0.11 mm tolerance of the Denar Centri-Check instrument. MATERIAL AND METHODS: A control group of 132 dentists and an experimental group of 11 dentists all made interocclusal records on the members of the experimental group. The control group used its "own best method" for achieving centric relation and the experimental group received standardized instruction and used a standardized technique of bimanual manipulation to achieve centric relation. RESULTS: The control group did not repeat condylar position within the 0.11 mm tolerance of the Denar Centri-Check instrument, whereas the experimental group did repeat condylar position within the 0.11 mm tolerance of the Denar Centri-Check instrument in 106 of 110 first attempts and in 4 of 4 second attempts. CONCLUSION: Given the extreme variations in recording centric relation, a stronger emphasis should be placed on this important skill in both undergraduate and postgraduate education.
Centric Relation↗
Comparison of condylar position in centric relation and in centric occlusion in dentulous subjects.
Explore the source record for details and available documents.
Adult↗
An appraisal of the literature on centric relation. Part III.
The literature directly and indirectly related to centric relation (CR) has been reviewed chronologically. More than 300 papers and quoted sections of books have been divided into three sections. The first two parts are related to CR. Studies in this group mainly compared, either the position of the mandibular condyle or the mandible itself in different CR recordings. Various tools were discussed for this purpose. The third part of the paper is about CR-centric occlusion (CO) discrepancy. CR still remains one of the controversial issues in prosthodontics and orthodontics. Debates such as mounting casts on the articulator by reproducible records for orthodontic treatment planning and end results, and whether or not orthodontic treatment based on CO causes TMJ dysfunction, remain unsolved. The references are listed at the end of Part III.
Centric Relation↗
An appraisal of the literature on centric relation. Part I.
The literature directly and indirectly related to centric relation (CR) has been reviewed chronologically. More than 300 papers and quoted sections of books have been divided into three sections. The first two parts are related to CR. Studies in this group mainly compared either the position of the mandibular condyle or the mandible itself in different CR recordings. Various tools were discussed for this purpose. The third part of the paper is about CR-centric occlusion (CO) discrepancy. CR still remains one of the controversial issues in prosthodontics and orthodontics. Debates such as mounting casts on the articulator by reproducible records for orthodontic treatment planning and end results, and whether or not orthodontic treatment based on CO causes temporomandibular joint dysfunction, remain unsolved. The references are listed at the end of Part III.
Centric Relation↗
An appraisal of the literature on centric relation. Part II.
The literature directly and indirectly related to centric relation (CR) has been reviewed chronologically. More than 300 papers and quoted sections of books have been divided into three sections. The first two parts of the paper are related to CR. Studies in this group mainly compared either the position of the mandibular condyle or the mandible itself in different CR recordings. Various tools were discussed for this purpose. The third part deals with CR-centric occlusion (CO) discrepancy. CR remains one of the controversial issues in prosthodontics and orthodontics. Debates relating to mounting casts on the articulator by reproducible records for orthodontic treatment planning and end results, and whether or not orthodontic treatment based on CO causes temporomandibular joint (TMJ) dysfunction, remain unsolved. The references are listed at the end of Part III.
Centric Relation↗
Reliability of a measuring-procedure to locate a muscle-determined centric relation position.
Although reproducibility of centric relation position, determined with an anterior deprogramming device, a leaf gauge, is widely accepted among clinicians, data confirming statistical evidence are lacking in the current literature. The objective of this study was to prove clinical reliability of a measuring-procedure to locate the centric relation position, determined with the leaf gauge. A sample of 15 subjects (6 men, 9 women, age 22 to 46), assessed with the Research Diagnostic Criteria to rule out any TMD-signs, was selected. Three observers each took three sequential interocclusal records with the leaf gauge, to mount a set of casts into the centric relation position in an articulator. Out of 15 subjects, 12 (5 men, 7 women) fitted criteria of precision--three out of three interocclusal records for each of the three observers--in a split-cast procedure. The applied statistical method is an analysis of variance model (ANOVA) with two factors for 3 observers and 12 subjects. The variance components estimation procedure is MIVQUE (0). The a was set at 0.05. No significant difference between observers for the measured variables sagittally (XL, XR), transversally (YL, YR), and vertically (ZL, ZR) could be found. MIVQUE variance components estimates for observers is < 0, varies for subjects from 0.04 to 0.20 and varies for error from 0.12 to 0.25 mm. Reliability of a measuring-procedure to locate a muscle-determined centric relation position could be established satisfactory.
Adult↗
A technique for evaluation of centric relation tooth contacts. Part II: Following use of an occlusal splint for treatment of temporomandibular joint dysfunction.
The purpose of this study was to determine the effect of TMJ dysfunction on the recording of centric relation. Centric relation was recorded using an anterior occlusal stop and by bimanual manipulation. Changes in occlusal contacts were recorded before and after occlusal splint therapy in six subjects with TMJ dysfunction. The pantographic reproducibility index and clinical signs and symptoms were used to determine the presence or absence of dysfunction. Use of the anterior occlusal stop resulted in a more posterior, superior initial tooth contact position when compared with bimanual manipulation. Occlusal contact positions were less consistent in TMJ dysfunction subjects than in control subjects. Initial occlusal contacts changed toward centric relation as the dysfunction disappeared. Final occlusal contact was found on the side where clinical signs and symptoms occurred. The condyle on the affected side appeared to be repositioned posteriorly and superiorly in most instances. Occlusal splint therapy was more effective when the splint was adjusted weekly. This study indicates the need to eliminate TMJ dysfunction before recording centric relation or adjusting the occlusion. Occlusal interferences found with TMJ dysfunction are not the same as occlusal interferences found when TMJ dysfunction is absent. Abnormal features on pantographic tracings may aid in indicating the presence of occlusal interferences. Occlusal adjustment in the presence of TMJ dysfunction would result in erroneous occlusal reduction.
Dental Occlusion↗
Variability of centric relation position in TMD patients.
Reproducibility of the centric relation position for patients with temporomandibular disorders (TMD) is not documented in the current literature. It was the objective of this study to assess clinical variability of the centric relation position for TMD patients with a muscle-determined technique by means of an anterior deprogramming device, the leaf gauge. A sample of 60 patients with signs of TMD was selected, 8 men (Mean age 28,6, SD 5,2) and 52 women (Mean age 30,5, SD 10,1). All patients were examined with the Research Diagnostic Criteria, including pain on movement and/or function, mouth opening, joint sounds and palpation of masticatory muscles. All 60 patients were allocated to one of the following diagnostic subgroups: myofascial pain, disk displacement with reduction, disk displacement without reduction, osteoarthritis, trauma. Twelve control subjects were taken from a previous study. Three sequential centric relation records were taken; the first one was used to mount a set of casts to an articulator. Criteria of precision were formulated beforehand: 2 out of 3 centric relation records had to be identical in a split-cast procedure. Variables XL and XR represented mandibular displacement in the sagittal plane, variables YL and YR in the transversal plane, and ZL and ZR in the vertical plane, on the left and right condylar level respectively. Variables XMIN, YMIN and ZMIN represented the minimal sagittal, transversal and vertical displacement left or right respectively. Likewise, variables XMAX, YMAX and ZMAX represented the maximal sagittal, transversal and vertical displacement left or right. XDIFF, YDIFF and ZDIFF represented the difference between the minimal and maximal values of X, Y and Z. The diagnostic subgroup trauma was excluded, because there was only one patient. The null-hypothesis of no between-group differences in within-subject and total variability was tested with an analysis of variance (ANOVA). The level of significance was set at 0.05. To minimize type I errors caused by multiple testing Scheffe's test was used to maintain an overall significance of 0.05. No significant difference between patients and control subjects could be found for variables XL, XR, YL, YR, ZR and ZL. Variables XMIN, YMIN, ZMIN, XMAX, YMAX, ZMAX, XDIFF, YDIFF and ZDIFF showed no significant differences. Scheffe's testing for the variables XL, XR, YL, YR, ZL and ZR, as well as the variables XMIN, YMIN, ZMIN, XMAX, YMAX, ZMAX, XDIFF YDIFF and ZDIFF showed no significant differences. The results of this study suggest no variability in centric relation position between TMD-patients and control subjects by means of the leaf gauge.
Adult↗
Techniques in recording centric relation.
1. Muscle seated centric registration is a reproducible method of obtaining centric relation (Wood, 1994). 2. The muscle-seated CR record provides a consistent, accurate, less technique-sensitive CR record of condylar position.
Centric Relation↗
[Reproducibility of the centric relation mandibular position].
The centric relation (CR) is an important position either diagnostically or therapeutically. It is supposed to register the proper position of the mandible in a verifiable and reproducible way. This study addresses the reproducibility of the CR. Intra-oral graphic recordings were carried out in 15 dental students and the antero-posterior and medio-lateral positions of the point of the tracings were evaluated. The tracings were reproduced within an area 162 +/- 55 microns on sagittal axis and 141 +/- 32 microns on transversal axis. The other aim of the study was to investigate the effects of the graphic and the leaf gauge registrations on the condyle position of an articulator. It was concluded that there were no significant differences in reproducibility between the two methods on sagittal and transversal axes, but on the vertical axis the graphic registration method proved to be significantly more reproducible than the leaf gauge registration.
Adult↗
A clinical evaluation of materials for interocclusal registration in centric relation.
Four techniques for interocclusal registrations of centric relation based on materials or combinations of materials usually utilized were tested by means of mounting of casts for a patient with partial lower edentulousness, without a free end saddle. To ensure the correct position of centric relation a Lucia jig was utilized. The following conditions for the record of posterior section were tested: registrations with wax, wax plus zinc oxide-eugenol paste, wax plus Duralay acrylic resin, and condensation silicone (putty). The evaluation was made by the measure of vertical distance between reference points in the base of the casts and calculation of variations occurring with each material. The combinations of wax plus zinc oxide-eugenol paste and wax plus Duralay acrylic resin showed the smallest variations in centric relation position.
Acrylic Resins↗