Comparative evaluation of condylar guidance obtained by three different interocclusal recording materials in a semi-adjustable articulator and digital panoramic radiographic images in dentate patients: An in vivo study.

Aim: The Aim of the study was to evaluate the reproducibility of condylar inclination values obtained using three different interocclusal recording materials in Hanau Wide-Vue semi-adjustable articulator and to compare those values of condylar inclination with panoramic radiographic images. Settings and Design: In Vivo Comparative study. Materials and Methods: The clinical trial was carried out in the Department of Prosthodontics, M. R Ambedkar Dental College and Hospital, Bengaluru. A total of 30 dentulous subjects aged between 20 and 40 years were selected, without any signs and symptoms of temporomandibular joint disorders. With the help of a custom-made protrusive guide, protrusive records for three materials were made. These records were used for programming the articulator and the respective horizontal condylar inclination (HCI) value, and panoramic radiographs were made. The values obtained were statistically analyzed. Statistical Analysis Used: Independent t-test, multiple comparisons using Bonferroni method followed by Analysis of variances (ANOVA) were used. Results: Among each pair of groups there exists a significant difference, i.e., the mean condylar inclination (degree) was found to be statistically significant between wax and polyvinyl siloxane (P < 0.01) as well as between wax and polyether (P < 0.01). No significant difference was observed between polyvinyl siloxane and polyether (P > 0.05). Conclusion: HCI values differed depending on the type of material employed. The study concluded that the protrusive condylar guidance angles obtained by panoramic radiograph can be used in programming the semi-adjustable articulator and among the materials polyether gave the highest Condylar Guidance values with less variability and wax gave lowest values with greater variation.

Clinical occlusion analysis versus semi-adjustable articulator and virtual articulator occlusion analysis.

BACKGROUND AND AIMS: Identifying the optimal method for occlusion analysis by comparing examination sensitivity of the static and dynamic occlusion using three systems: clinical occlusion analysis, semi-adjustable articulator and virtual articulator (3Shape, Denmark) occlusion analysis. METHODS: The occlusion analysis of sixteen patients was performed using the three systems. In order to analyze the number of concordant and discordant points and trajectories, the clinical method was compared to the semi-adjustable articulator and to the computerized method. RESULTS: The greatest correspondence was obtained by comparing the clinical and the articulator methods, having a success rate of 85.25%, versus the clinical and the computerized method with a success rate of 73.25%. The propulsion registered the highest discrepancies: 35% in case of the semi-adjustable articulator comparison and 62% in case of the virtual articulator comparison. CONCLUSIONS: The semi-adjustable articulator was superior in static and dynamic occlusion analysis compared to the virtual articulator. The analysis of the dynamic occlusion is the most problematic due to its dependency on the individual anatomy of the glenoid fossa which cannot be exactly reproduced by any articulator.

Evaluation of Two Facebow/Semi-adjustable Articulator Systems for Orienting Maxillary Cast on Articulators: A Pilot Study.

AIM: The present study was aimed to assess the transferability of occlusal plane (OP) orientation from the patient to the articulators with the help of two different facebow systems and evaluated with a gold standard. MATERIALS AND METHODS: Twenty dentate patients were selected for the study. Two semi-adjustable arcon articulators that are Hanau Wide(®) Vue using SpringBow and Whip Mix(®) using quick-mount facebow were used in the study. Mean angle between OP to horizontal reference plane obtained from Hanau Wide Vue articulator system (SpringBow using Orbitale as anterior reference point) and Whip Mix articulator system (quickmount facebow using nasion as anterior reference point) was tabulated. These values obtained were further compared with each other and evaluated against cephalometric evidence, which was considered as the gold standard for the study. Descriptive statistics, analysis of variance, Scheffe post hoc analysis for group comparison, and level of significance (P) was calculated using Statistical Package for the Social Sciences version 16 (IBM, New York, USA) software program. RESULTS: Intragroup comparison of mean angle OP values showed highly significant difference (p = 0.000). Comparison between Hanau Wide Vue articulator system and Whip Mix articulator system showed statistically highly significant with a mean difference of 10.51° with Hanau system values being lower than Whip Mix system. Difference between Hanau system and cephalometric values were statistically significant with a mean difference of 2.835° and Hanau system consistently recording lower values than cephalometric values. Difference between Whip Mix system and cephalometric values was also statistically significant with a mean difference of 7.680° with group 2 values were on average 7.680° higher than group 3. CONCLUSION: Within the limitations of this study, the Hanau system and Whip Mix system showed significant difference in reproduction of angle between OP and horizontal reference plane. Hanau articulator system showed closer values to that of cephalometric values in comparison with Whip Mix articulator system. CLINICAL SIGNIFICANCE: Orientation of the maxillary cast in an articulator is a crucial part of several techniques used in dentistry. Orientation of maxillary cast in the articulator acts as a baseline from which further steps for occlusal rehabilitation of the patients are carried out. Recording and transferring of the occlusal cant to articulators require facebow.

Ruidos artículares y su relación con la presencia de interferencias oclusales en el lado de no trabajo, mediante evaluación clínica en adultos entre 20 y 40 años de edad / Temporomandibular joint (TMJ) sounds and their relation to occlusal interferences in the non-working side: a clinical evaluation in patients between 20 and 40 years of age

Considerada como una articulación glinglimoartrorial, la Articulación Témporo-mandibular (ATM) realiza todos los movimientos en el espacio, sin presentar ningún signo o síntoma en condiciones normales, sin embargo en presencia de anomalías manifiesta ruidos, partiendo de este enfoque nos centramos a analizar si estos ruidos articulares se encuentran relacionados con la oclusión dental, específicamente con la presencia de interferencias oclusales en el lado de no trabajo, en adultos de ambos sexos de entre 20 - 40 años de edad totalmente dentados. De esta forma 31 participantes que presentaron ruidos articulares en los diferentes movimientos mandibulares, fueron evaluados en cuanto a la clase de Angle, guías laterales, presencia de guía canina normal y presencia o ausencia de función de grupo. Analizando clínicamente la presencia de interferencias en el lado de no trabajo y comprobando estas interferencias en articulador semiajustable (ASA) tipo Bioart. Los datos obtenidos fueron analizados en el programa SPSS versión XX, revelando una relación entre los ruidos articulares y la presencia de interferencias oclusales en el lado de no trabajo, sin embargo, evidenciando cierta relación entre la presencia de interferencias oclusales con género, presente con mayor prevalencia en el género masculino que en femenino.

Considered as a glinglymoarthrodial articulation, the temporomandibular joint) (TMJ) is both a hinging and a sliding joint. In a healthy condition the joint doesn't show any particular sign or symptom, however if there is a dysfunction it will present noises during jaw movement. Starting from this principle, we analyzed if the TMJ dysfunction sounds are connected to dental malocclusion, focusing on occlusal interferences in the non-working side, in patients between 20 and 40 years of age. Thirty-one patients presented articular noises during jaw movement, so we proceeded to evaluate Angle class (molar relationship), lateral guidance, normal canine guidance and the presence or absence of group function. Clinically, we analyzed the presence of interferences in the non-working side and we studied them using a Semi-adjustable Articulator (ASA) (Bioart). The data, evaluated using the program SPSS Version XX, revealed a clear relation between articular noises and interferences in the non-working side, however the population of men showed a higher rate of occlusal interferences than that of women.

El arco facial en la elaboración de las férulas oclusales tipo Míchigan / Face bows in the production of Michigan occlusal splints

Introducción: la férula oclusal tipo Míchigan (FOM) es un dispositivo usado frecuentemente para el manejo de pacientes con bruxismo. La literatura menciona el uso del arco facial para el montaje de modelos en el articulador semiajustable, sin embargo el beneficio de este en la elaboración de las FOM aún es controvertido. Por lo tanto el objetivo de esta investigación fue comparar el registro de número de puntos de contacto y el tiempo de ajuste entre las FOM elaboradas con y sin el uso del arco facial en pacientes con diagnóstico de bruxismo. Métodos: se elaboraron 90 férulas entregadas a 45 pacientes de la Clínica de Rehabilitación Benemérita Universidad Autónoma de Puebla (BUAP), previo diagnóstico de bruxismo. Las dos férulas elaboradas (una con modelos montados con arco facial y otra sin él), se compararon en el articulador y clínicamente. Se registró el número de puntos de contacto obtenidos en ambas férulas y el tiempo de ajuste requerido. Las comparaciones se hicieron con la prueba estadística de Wilcoxon y significancia menor a 0,05. Resultados: la media de puntos de contacto en boca de las férulas con el uso del arco fue superior (11,67) a la de sin uso del arco (11,58) sin diferencias significativas (p = 0,799). El tiempo de ajuste fue superior en las férulas elaboradas sin arco (51 s) que con arco (33 s), sin diferencias significativas (p = 0,332). Conclusión: no existen diferencias significativas con el uso del arco facial o sin él para la elaboración de las FOM en pacientes bruxómanos.

Introduction: Michigan occlusal splints (MOS) are frequently used for the management of patients with bruxism. The literature mentions the use of face bows for mounting models in semi-adjustable articulators, but its benefit in the production of MOS is still controversial. Therefore, the objective of this study was to compare the record of number of contact points and mounting time between MOS made with and without face bows in patients diagnosed with bruxism. Methods: a total of 90 splints were made and distributed among 45 patients diagnosed with bruxism at the Oral Rehabilitation Clinic of Benemérita Universidad Autónoma de Puebla (BUAP). The two splints (one made with a face bow mounted model and the other one without it) were compared at the articulator and clinically. The number of obtained contact points was recorded in both splints as well as the time needed for mounting. The comparisons were made with Wilcoxon statistical test and a significance level lower than 0.05. Results: the splints with face bows showed a greater average of contact points in the mouth (11.67) compared with the ones without face bows (11.58), with no significant difference (p = 0.799). Mounting time was higher in the splints made without face bows (51 s) compared with the ones with face bows (33 s), with no significant difference (p = 0.332). Conclusion: there are no significant differences in using face bows for developing MOS in bruxism patients.

A study on the difference of the sagittal condylar guidance by semi-adjustable articulator and axiograph / 대한치과보철학회지

STATEMENT OF PROBLEM: In the Protar articulator, the models are almost parallel with the Camper's plane. The ultrasonic-based ARCUSdigma system is basis for the determination of dynamic function parameters with so-called "articulator related registration". PURPOSE: The purpose of this study was to compare the sagittal condylar guidance angles found by use of the wax protrusive records in a semi-adjustable articulator(KaVo Protar 7) with those found by use of the Axiograph(ARCUSdigma). 83 volunteers with intact dentition participated in this study after obtainment of informed consent. MATERIAL AND METHOD: The sagittal condylar guidance angles were measured and estimated statistically by semi-articulator and Axiograph. All the readings were in degrees. No control was used in this project. To test whether there was a significant difference between the 2 independent samples, paired t-test and Kruskal-Wallis test were carried out(p=.05). RESULTS: 1. The mean results for the wax protrusive records were as follow: right side (32.65 degrees, SD 16.48); left side (33.27 degrees, SD 17.49). 2. The mean results for the Axiograph were as follow: right side (32.26 degrees, SD 7.00); left side (33.07 degrees, SD 7.58). 3. There was no statistical difference on the wax protrusive records and Axiograph(p>0.05). CONCLUSION: Both methods of wax protrusive records and Axiograph are clinically acceptable for measuring the sagittal condylar guidance angles in semi-adjustable articulators.