Torres - Naranjilla MDA

Statement of the Problem
The study aimed to determine the correlation of mesio-distal width of lower incisors to the required space for the canine, first premolar and second premolar among Filipinos.

Specifically, this study sought to answers the following questions:
1. What is the profile of the subjects in terms of age & gender?
2. What are the combined mesio-distal widths of the lower permanentincisors among Filipinos with Class I Occlusion?
3. What are the measurements of the permanent canine, first premolar and second
premolar in First Quadrant, Second Quadrant, Third Quadrant and Fourth Quadrant ?
4. How does the mesio-distal width of the lower incisors correlate with the required space for the permanent canine, first premolar and second premolar?
5. What is the predictive required space for permanent canine, first premolar and
second premolar based on the Mesio-distal width of the lower incisors?
6. How did the predictive results compare to Go 75 and Moyer’s MDA?

Procedure
Impressions and fabrication of dental cast were done at MagnifidentInc Clinic including the evaluation and measurement of spaces and of tooth sizes. The process of selection of subjects relied on the sixty subjects with combination of male and female, and should not be below 15 years old.

Six general steps on how to do the measurements:
1. Measure the width of the four lower incisors directly on the dental cast.
2. Add the total width of the four lower incisors.
3. Record the total width of the four lower incisors
4. Measure the length of the arch from distal surface of lateral incisors to mesial surface of first molar in all quadrants.
5. Make a definite tabulation for each measurement.
6. Correlate and compare all the values of each case to assess and evaluate how they are correlated to each other.

Treatment of Data
1. Frequency and percentage.
2. Mean and Standard Deviation.
3. Pearson r.
4. Regression analysis
5. T- Test.

Findings
1. There is no significant difference between the predicted required space for canine, first premolar, and second premolar (TN MDA) as compared with actual values of samples.
2. A linear regression equation was found,for upper arch = .315 (x)+15.161 with standard deviation of 1.8, and equation for lower arch: =.421 (x)+11.808 with standard deviation of SD 1.8.

Conclusions
1. The results of the present study strongly indicate a correlation between the measurement of Mesio-distal width of lower incisors to the required space needed for erupting canine and premolars in all quadrants.

2. The regression analysis of Torres –Naranjilla (TN) MDA shows constant accuracy for both upper arch and lower arch. The TN MDA regression analysis can be strongly recommended for the use of Filipino patients during mixed dentition analysis.

3. It is also concluded that the TN MDA is more accurate to use among Filipinos compared to Go 75 MDA and Moyers MDA based on the statistical result and significant values.

Recommendations
Based on the findings and conclusions derived from the gathered data, the following recommendations are hereby given:

1. For the Graduate School of Orthodontics -The department can impose the TN MDA equations derived in the present study to be used in mixed dentition analysis.The clinician must use the MDA specific for each ethnic group when treating patients. The formula derived from this study must be used for Filipino mixed dentition analysis

2. For the Orthodontist, General Practitioner & other Dental Practioner -All Dental Practitioner in the Philippines which has a concern to mixed dentition analysis must be informed and make aware of the TN MDA equation, thus use it to make their analysis more accurate and for better treatment planning during mixed dentition period.

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