Comparative study of intermaxillary relationships of manual and swallowing methods

Abstract

This study compared the mandibular displacement from three methods of centric relation record using an anterior jig associated with (A) chin point guidance, (B) swallowing (control group) and (C) bimanual manipulation. Ten patients aged 25-39 years were selected if they met the following inclusion criteria: complete dentition (up to the second molars), Angle class I and absence of signs and symptoms of temporomandibular disorders and diagnostic casts showing stability in the maximum intercuspation (MI) position. Impressions of maxillary and mandibular arches were made with an irreversible hydrocolloid impression material. Master casts of each patient were obtained, mounted on a microscope table in MI as a reference position and 5 records of each method were made per patient. The mandibular casts were then repositioned with records interposed and new measurements were obtained. The difference between the two readings allowed measuring the displacement of the mandible in the anteroposterior and lateral axes. Data were analyzed statistically by ANOVA and Tukey's test at 5% significance level. There was no statistically significant differences (p>0.05) among the three methods for measuring lateral displacement (A=0.38 +/- 0.26, B=0.32 +/- 0.25 and C=0.32 +/- 0.23). For the anteroposterior displacement (A=2.76 +/- 1.43, B=2.46 +/- 1.48 and C=2.97 +/- 1.51), the swallowing method (B) differed significantly from the others (p<0.05), but no significant difference (p>0.05) was found between chin point guidance (A) and bimanual manipulation (C). In conclusion, the swallowing method produced smaller mandibular posterior displacement than the other methods.

Condylar positions generated by five centric relation recording techniques

“…These techniques positioned the condyles more inferiorly and posteriorly relative to the condylar positions obtained from the Roth Power Bite and Leaf Gauge Techniques. Alverez et al, [21] also found no difference between condylar locations produced by the Chin Point Guidance and Bimanual Manipulation Techniques in the anterior-posterior dimension. Kantor et al, [11] likewise, found that the Chin Point Guidance and Bimanual Manipulation Techniques created the most similar mandibular displacement when compared with a swallowing technique and Chin Point Guidance with an anterior jig.…”

Identification of occlusal prematurity by clinical examination and cone-beam computed tomography

“…The choice for the frontal manipulation technique designed by Ramfjord and Ash (1983) is attributed to its high reproducibility and applicability among the record-guided techniques when used gently It is used only to guide the patient properly relaxed while searching for a comfortable CR position, making a hypothetical clockwise condylar displacement (15,24).…”

Centric relation in prosthetic rehabilitation

“…Należy jednak pamiętać, że wielkość położenia spoczynkowego żuchwy zależy od wielu czynników, takich jak: postawa ciała, pozycja żuchwy, napięcie psychoemocjonalne. [30][31][32][33][34][35][36] Z tego powodu, w celu określenia wysokości zwarcia stosowane są dodatkowe metody postępowania (analiza telerentgenogramów bocznych głowy, aksjografia, kinezjografia). 6,37-44 Na podstawie telerentgenogramów bocznych głowy oblicza się wysokość dolnego odcinka twarzy.…”

“…32,37 Druga metoda wykorzystuje odruch połykania, kiedy w końcowej fazie przełykania śliny żu-chwa ustawia się w pożądanej, najbardziej dotylnej, ale niewymuszonej pozycji. [33][34][35][36] Ustalanie relacji centralnej można opierać na stosowaniu zarówno czynnych, jak i biernych metod postępowania. Położenie żuchwy w relacji centralnej można uzyskać bez specjalistycznej aparatury, wykorzystując pracę mięśni żucia i więzadeł, co potwierdzają badania przeprowadzone przez McKee.…”