broadrick occlusal curve/ orthodontic straight wire technique
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The study examines the validity of the Broadrick flag method in determining the ideal occlusal curve in dentate patients, involving 100 participants with intact dentition. Results indicate that 55% of subjects conformed closely to the ideal curve, with no significant correlation between deviations and demographics or occlusal classifications. The findings support the method's reliability while noting limitations, such as the low number of Class III cases and the absence of radiographic assessments.
broadrick occlusal curve/ orthodontic straight wire technique
- 1. “A study of the proximity of the Broadrick ideal occlusal curve to the existing occlusal curve in dentate patients”INDIAN DENTAL ACADEMY Leader in continuing dental education www.indiandentalacademy.com
- 3. 08/08/14 www.indiandentalacademy.com 3 CURVE OF SPEE •Anteroposterior curve which passes through the cusp tip of the mandibular canine and the buccal cusp tips of the mandibular premolar and molar teeth ,extends posteriorly to pass through the anterior point of the mandibular condyle. •The radius of this curve is 4 inches, and is best viewed from the lateral aspect.
- 4. 08/08/14 www.indiandentalacademy.com 4 AIM OF STUDY “To investigate whether the Broadrick flag method of determining the appropriate occlusal curve for individual patients has any basis in natural dentitions”
- 5. 08/08/14 www.indiandentalacademy.com 5 MATERIALS AND METHODS •100 dentate individuals with no missing posterior teeth were recruited from Undergraduate Restorative Clinic with intact upper and lower arches (all teeth present with the exception of third molars). • All patients were over 18 years of age.
- 6. 08/08/14 www.indiandentalacademy.com 6 SAMPLE •The sample consisted of 50 female and 50 male patients. •The age range of the sample was 20–79 years. The mean age was 50.26 years. •50% of the subjects had the curve assessed on the right side of the arch and 50% on the left. •Allocation to each group was random .
- 7. 08/08/14 www.indiandentalacademy.com 7 • The models were made and trimmed in a seven-sided configuration, so that the buccal plane would lie parallel to the scanner surface when the models were placed on it. • Pair of study models were placed on the scanning bed of a Black widow 9636 USB three dimensional scanner . • The images were stored in Microsoft 'Picture it' format to retain the three dimensional quality of the image.
- 8. 08/08/14 www.indiandentalacademy.com 8 •Using the Broadrick flag method described by Lynch and McConnell , the ideal occlusal plane was created using the scanned images. • The software used was Quick CAD Millennium edition. •This method of estimating an ideal occlusal curve uses anterior and posterior points in order to determine its radius, and thereby allow the curve to be scribed on study models.
- 9. 08/08/14 www.indiandentalacademy.com 9 BROADRICK ANTERIOR SURVEY POINT. DRAWING OCCLUSAL CURVE
- 11. 08/08/14 www.indiandentalacademy.com 11 •Class 2 incisal relationships, the initial arc radius was 3.75 inches and class 3 relationships a 5-inch arc was used. •The incisal relationship was determined by the overjet measurement and classified as follows – 1–3 mm over jet – class I(48% of subjects) >3 mm over jet – class II(45% of subjects) <1 mm or reverse over jet – class III (7% of subjects).
- 12. 08/08/14 www.indiandentalacademy.com 12 RESULTS • 55% of the subjects investigated had no teeth deviating from the generated curve. OF THOSE WITH MEASURABLE DEVIATION - 3 subjects had maximum deviation between 0.01- 0.5 mm - 15 had a maximum deviation between 0.51 – 1 mm - 18 had a maximum deviation between 1.01 – 1.5 mm - 9 had a measurable deviation >1.5 mm
- 14. 08/08/14 www.indiandentalacademy.com 14 RESULTS cont… • Correlation coefficients showed no statistically significant correlation between the deviation from the Broadrick curve and age, sex and overjet .
- 15. 08/08/14 www.indiandentalacademy.com 15 •The results of this study indicate that the use of the Broadrick flag method provides a good approximation of the natural occlusal curve for a wide range of patients, with no correlation between deviation for this curve and age or sex of the patients, or the incisal classification.
- 16. 08/08/14 www.indiandentalacademy.com 16 DISCUSSIONDISCUSSION • This method of model measurement hasThis method of model measurement has previously been described by Craddock andpreviously been described by Craddock and Youngson and found to be reliable.Youngson and found to be reliable. • The results from this study support its use as aThe results from this study support its use as a scientific instrument.scientific instrument. • Modifications were incorporated into the studyModifications were incorporated into the study for class II and III cases.for class II and III cases.
- 17. 08/08/14 www.indiandentalacademy.com 17 •Extending the Occlusal curve through the mandibular condyle is considered essential when designing proper posterior disclusion . •The anterior point of the condylar element is a useful choice for the PSP when the position of the distal mandibular molar is unsuitable.
- 18. 08/08/14 www.indiandentalacademy.com 18 ADVANTAGES OF THE STUDY • Good intra examiner reliability • The sample contained a wide age range of adult patients of both sexes, mean age 50.26 • Individual tooth was taken for recording deviation from curve of spee , instead of quadrant. • For certain aesthetic and functional scenarios such as classII & class III cases centre of the curve located was modified slightly.
- 19. 08/08/14 www.indiandentalacademy.com 19 SHORT COMINGS OF THE STUDY •The number of class lll patients was relatively low and further study of this subgroup may be appropriate . •No radiographic examination was done to determine skeletal or dental malocclusions
- 21. 08/08/14 www.indiandentalacademy.com 21 For more details please visit www.indiandentalacademy.com