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A newer technique to program a semi adjustable articulator.

Venkateshwaran R, Karthigeyan S, Manoharan PS, Konchada J, Ramaswamy M - J Pharm Bioallied Sci (2014)

Bottom Line: The results were subjected to the Pearson correlation statistical analysis (α =0.01).A significant correlation was found between the horizontal condylar inclination on a semi-adjustable and the corresponding TMJ tomogram radiographic image for both right (R = 0.789; P = 0.001) and left (i = 0.747; P = 0.004) sides.The articular eminence traced on a TMJ tomogram image represents the horizontal condylar inclination with a mean difference of 5° in 21 subjects evaluated.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Sree Balaji Dental College, Bharath University, Pallikaranai, Chennai, Tamil Nadu, India.

ABSTRACT

Introduction: The difficulty in reproducing accurate angle of condylar guidance in semi-adjustable articulators.

Purpose: The purpose of this study was to determine the correlation between the angle of horizontal condylar inclination obtained on a semi-adjustable articulator and the corresponding angle traced on a temporomandibular joint (TMJ) radiograph in completely edentulous subject.

Materials and methods: The horizontal condylar inclination angle was obtained in a semi-adjustable articulator by means of height tracer (extra oral tracing device) and interocclusal records to program the articulator in 21 subjects. TMJ radiograph were recorded by the same operator with same orthopantomogram (OPG) machine (planmeca). Tracings of inclines of articular eminence on the radiograph were compared with the angle obtained on a semi-adjustable articulator. Each measurement was made using manual methods of measuring angle. The results were subjected to the Pearson correlation statistical analysis (α =0.01).

Results: The outline of the articular eminence in a TMJ tomogram radiographic image was identified and traced. A significant correlation was found between the horizontal condylar inclination on a semi-adjustable and the corresponding TMJ tomogram radiographic image for both right (R = 0.789; P = 0.001) and left (i = 0.747; P = 0.004) sides.

Conclusion: The articular eminence traced on a TMJ tomogram image represents the horizontal condylar inclination with a mean difference of 5° in 21 subjects evaluated.

No MeSH data available.


Related in: MedlinePlus

Centric record and protrusive record
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Figure 1: Centric record and protrusive record

Mentions: All steps of complete denture procedures were done. A tentative jaw relation was performed and the maxillary cast was oriented to the articulator using a Hanau spring bow. Using the nick and notch method a static record of centric relation was obtained using Zinc Oxide Eugenol (ZOE) impression paste as interocclusal recording material. Once, the cast was oriented in articulator. Extra oral tracer height tracing device was used in this study. The patient was trained for tracing of mandibular border movements in the way as prescribed by Ney mandibular excursion guide. The completely edentulous subjects were trained for tracing of mandibular movement until a sharp arrow point tracing was obtained. Measuring 6 mm from the apex of the tracing a point is marked over the transparent sheet and this will represent the protrusive position. Once this is accomplished nick are made in the occlusal rim of both maxilla and mandible correspondingly in canine and molar region. Then the surface of the occlusal rim is coated with petrolatum and using the polyvinyl siloxane material (3M CAD BITE, ESPE, Virtual CAD bite registration material, Ivoclar, Zurich, Switzerland) as an interocclusal record centric record is obtained [Figure 1]. Then the patient is asked to close the mandible in a forward position to represent the protruded position of mandible such that the stylus is positioned on the 6 mm marking on the tracing plate. Interocclusal record material is injected to obtain a protrusive record. The interocclusal record material flows easily and should be rigid on setting.


A newer technique to program a semi adjustable articulator.

Venkateshwaran R, Karthigeyan S, Manoharan PS, Konchada J, Ramaswamy M - J Pharm Bioallied Sci (2014)

Centric record and protrusive record
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4157252&req=5

Figure 1: Centric record and protrusive record
Mentions: All steps of complete denture procedures were done. A tentative jaw relation was performed and the maxillary cast was oriented to the articulator using a Hanau spring bow. Using the nick and notch method a static record of centric relation was obtained using Zinc Oxide Eugenol (ZOE) impression paste as interocclusal recording material. Once, the cast was oriented in articulator. Extra oral tracer height tracing device was used in this study. The patient was trained for tracing of mandibular border movements in the way as prescribed by Ney mandibular excursion guide. The completely edentulous subjects were trained for tracing of mandibular movement until a sharp arrow point tracing was obtained. Measuring 6 mm from the apex of the tracing a point is marked over the transparent sheet and this will represent the protrusive position. Once this is accomplished nick are made in the occlusal rim of both maxilla and mandible correspondingly in canine and molar region. Then the surface of the occlusal rim is coated with petrolatum and using the polyvinyl siloxane material (3M CAD BITE, ESPE, Virtual CAD bite registration material, Ivoclar, Zurich, Switzerland) as an interocclusal record centric record is obtained [Figure 1]. Then the patient is asked to close the mandible in a forward position to represent the protruded position of mandible such that the stylus is positioned on the 6 mm marking on the tracing plate. Interocclusal record material is injected to obtain a protrusive record. The interocclusal record material flows easily and should be rigid on setting.

Bottom Line: The results were subjected to the Pearson correlation statistical analysis (α =0.01).A significant correlation was found between the horizontal condylar inclination on a semi-adjustable and the corresponding TMJ tomogram radiographic image for both right (R = 0.789; P = 0.001) and left (i = 0.747; P = 0.004) sides.The articular eminence traced on a TMJ tomogram image represents the horizontal condylar inclination with a mean difference of 5° in 21 subjects evaluated.

View Article: PubMed Central - PubMed

Affiliation: Department of Prosthodontics, Sree Balaji Dental College, Bharath University, Pallikaranai, Chennai, Tamil Nadu, India.

ABSTRACT

Introduction: The difficulty in reproducing accurate angle of condylar guidance in semi-adjustable articulators.

Purpose: The purpose of this study was to determine the correlation between the angle of horizontal condylar inclination obtained on a semi-adjustable articulator and the corresponding angle traced on a temporomandibular joint (TMJ) radiograph in completely edentulous subject.

Materials and methods: The horizontal condylar inclination angle was obtained in a semi-adjustable articulator by means of height tracer (extra oral tracing device) and interocclusal records to program the articulator in 21 subjects. TMJ radiograph were recorded by the same operator with same orthopantomogram (OPG) machine (planmeca). Tracings of inclines of articular eminence on the radiograph were compared with the angle obtained on a semi-adjustable articulator. Each measurement was made using manual methods of measuring angle. The results were subjected to the Pearson correlation statistical analysis (α =0.01).

Results: The outline of the articular eminence in a TMJ tomogram radiographic image was identified and traced. A significant correlation was found between the horizontal condylar inclination on a semi-adjustable and the corresponding TMJ tomogram radiographic image for both right (R = 0.789; P = 0.001) and left (i = 0.747; P = 0.004) sides.

Conclusion: The articular eminence traced on a TMJ tomogram image represents the horizontal condylar inclination with a mean difference of 5° in 21 subjects evaluated.

No MeSH data available.


Related in: MedlinePlus