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At least 19 recordsLinked to original sources
PubMed1977

Comparison of Myo-Monitor centric position to centric relation and centric occlusion.

Twenty dentulous subjects were selected at random. A Hight tracer, fixed on the labial surface of the teeth by special clutches, was used to indicate a record of centric relation and centric occlusion. The Myo-Monitor centric position was recorded and compared to centric occlusion and centric relation in anteroposterior and lateral dimensions. This study indicated that: 1. Myo-Monitor centric position is always anterior to centric relation, with an average of 3.8 min. 2. Myo-Monitor centric position is always anterior to centric occlusion, with an average of 1.8 mm. 3. In 18 of 20 subjects, the Myo-Monitor registration was to the right or to the left side of the line between centric relation and centric occlusion. 4. In all subjects, centric occlusion was an average of 2.2 mm. anterior to centric relation.

Adult↗
PubMed1978

[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↗
PubMed1985

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↗
PubMed1990

[Objective evaluation of the mandibular position by the change in the function of the middle ear. 1. Centric relation and lateral eccentric position].

Tympanometric measurement has been made on centric relation and working side and non-working side in 19 healthy subjects (12 males and 7 females aged 23-27) and the following conclusions have been obtained: 1. The Tympanogram in the healthy subjects showed a symmetrical pattern, being of type A bilaterally, in all the cases, and no lateral or sexual difference was seen any item of measurement. 2. S. C. value increased in order of centric relation, working side and non-working side, but decreased in IMP., PRS. and EAC.. 3. Significant differences were observed in the items of measurement regarding S. C. and IMP. all between centic relation and working side, centric relation and non-working side, working side and non-working side. These findings show a correlation between the function of middle ear and the horizontal mandibular position. Therefore these findings suggest the possibility of tympanometric measurement becoming one of the parameters as the method for objective evaluation of the mandibular position as the change in the function of the middle ear.

Acoustic Impedance Tests↗
PubMed1979

Centric relation. Its effect on occluso-muscle harmony.

The most common cause of pain in the region of the temporomandibular joint is occluso-muscle imbalance. This results most often from disharmony between the articulation of the teeth and the centric relation of the condyles. Muscle tenderness of palpation indicates that muscle is involved. An examination must then be done to determine the cause of the muscle tenderness. Before the condyle-occlusion relationship can be evaluated, an accurate centric relation must be determined and verified. The condyles are in centric relation when they are in the most superior position possible in the fossae. From that apex of force position, the condyle can travel neither forward nor backward without moving downward. This position can be located with careful bilateral manipulation and then verified if it can resist firm pressure with no tension or tenderness. Until this correct centric relation is located and verified, it is not possible to properly evaluate the occlusal relationship to the temporomandibular joints. If the occlusion is harmonized to a centric related condyle that can resist firm pressure with pressure with no discomfort, there will be no reason for the muscles to protect either the teeth or the joints. If an occlusion is adjusted to a malrelated condylar position, the occluso-muscle imbalance will be perpetuated and often intensified. Centric relation is the starting point of occlusal contact. Incline interferences in excusive movements must also be eliminated and the occlusion must be harmonized to the envelope of function for each patient. If centric relation is not properly located, occlusal interferences will remain regardless of what procedures are used to record or adjust excursive movements.

Dental Occlusion↗
PubMed1985

A technique for evaluation of centric relation tooth contacts. Part I: During normal temporomandibular joint function.

An indirect method to locate the first tooth contacts in centric relation was described in this study. Mounted casts with an associated table and styli were used to locate the position of contact points in three planes. The method was tested using the anterior occlusal stop with chin point guidance and bimanual manipulation for recording centric relation. Ten records from one subject were analyzed statistically for each method. At the p less than .05 level of significance, the anterior occlusal stop produced a centric relation position more posterior than that found with bimanual manipulation. There was no statistically significant difference in the vertical and mediolateral planes. The anterior occlusal stop method produced more consistent tooth contacts in all three planes. The centric relation points found on the recording plates correlated well with the initial tooth contacts marked on the cast. This indirect method is an accurate means of recording and reevaluating changes in tooth contact positions in three planes.

Acrylic Resins↗
PubMedDate not supplied

Fixed prosthodontics centric relation registration technique using resin copings.

The registration of an accurate centric relation is one of the most critical steps in a prosthodontic rehabilitation, yet it sometimes is an uncertain procedure. A technique using resin copings, each supporting an occlusal contact, is presented. By careful, selective addition of resin, the centric relation recording can be controlled. The technique requires a pattern of abutments to provide stability, and is, therefore, primarily applicable to fixed prosthodontics. Nonetheless, it is versatile enough to accommodate a variety of clinical situations.

Dental Occlusion, Centric↗
PubMed1979

Replicability of chinpoint-guidance and anterior programmer for recording centric relation.

The chinpoint-guidance technique, using an anterior programmer, as performed in this study, seems to be a replicable method of locating centric relation. Sequential registration of centric relation was repeatable in 60% of the patients studied. The average variability found in 40% of the patients of this study was about +/- 0.20 mm at the level of the condyles.

Adult↗
PubMedDate not supplied

Movement between centric relation contact position and the intercuspal position.

Casts of 42 patients free from temporomandibular joint problems were mounted on an articulator in centric relation contact position. The movement of the horizontal axis of rotation was measured when the casts were moved from centric relation contact position to the intercuspal position. Measurements of the vertical and horizontal movements of the incisal pin were also made during this movement. There was a highly significant correlation between the movement of the horizontal axis in the horizontal plane and the ratio of vertical to horizontal movement as measured at the incisal pin. The greater this ratio was, the smaller the horizontal movement of the axis was; the smaller the ratio (the larger the horizontal component) was, the larger was the horizontal movement of the axis. The clinical implications are discussed.

Adult↗
PubMed1990

Centric relation and programming semiadjustable articulators with the universal jig. Part I: Technique.

To obtain centric relation and program recordings, a universal jig was made to be molded after adjustment to the upper incisors by means of dental plaster. The jig can be produced by means of an autopolymerizing resin mold based on the wax model. Once the jig is in position, the patient is asked to produce left and right lateral movements until muscular relaxation is obtained. This allows centric relation to be recorded by whatever method use. After plaster has been injected on the occlusal surfaces of the teeth, the patient is asked to close his jaws on the jig and to perform either a propulsion movement or left- or right-lateral movement so as to obtain two plaster "bites" ready for the programming of semiajustable articulators.

Dental Articulators↗
PubMed1991

Centric relation and programming semiadjustable articulators with the universal jig. Part II: Experiments.

The "universal jig" described in a previous article was tested on 10 patients to check for reliability. The recording of centric relation by this method was compared with Lucia's method of recording centric relation. The results of three series of three recordings were analyzed. The influence of the universal jig on rear-determinant movement was measured by two pantographic recordings, one enabling occlusion to take place, the other using the universal jig. The results were analyzed and demonstrated that the universal jig is a reliable means of simplifying the setting up of models and the programming of semiadjustable articulators.

Centric Relation↗