Ahmed T. Farag, Sherine E. Taha And Randa Y. Abdel-Gawad,

ABSTRACT
The Mesio-distal Crown Diameter Of Teeth Is An Important Factor Which Affects The Alignment Of Teeth In The Bony Arches And The Development Of Occlusion During Transition Of The Dentition. This Study Was Concerned With The Mesio-distal Width And Dental Arch Dimensions In Egyptian Children In Rural Areas Of Al Giza Governorate Which Will Be Helpful To Overcome Obstacles Which May Be Faced In Different Fields Of Dentistry (orthodontics, Pedodontics, Prosthodontics And Oral Surgery).
Objectives: Determine The Combined Mesio-distal Width Of The Permanent Mandibular Incisors And That Of The Maxillary And Mandibular Canines And Premolars In A Group Of Egyptian Children In Rural Areas Of Al Giza Governorate. And To Find The Correct Relationship Of The Total Mesiodistal Widths Of Teeth Under Study. Methods: A Sample Of 280 Egyptian Childeren With An Age Range From 12-15 Years Attending Schools In Rural Areas Of Al Giza Governorate. The Children Were Referred From These Schools (Almansorya, Berkash, Nekla And Abdelsamad?s) To The Local Medical Health Unit In Al Giza Governorate To Be Examined.

Results: In This Study The Results Showed That The Teeth Size Of Male Subjects Was Slightly Larger Than That Of The Female Subjects. There Was No Statistical Significant Difference In The Mean Of Mesiodistal Tooth Width Between Right And Left Sides For Almost All Teeth Under Study. And A Positive Correlation Exists Between The Sum Of The Mesiodistal Width Of Upper Right Canine And Premolars & The Sum Of The Mesiodistal Width Of The Lower Incisors Among Both Genders Combined. Conclusion: The Mesiodistal Width Of Upper And Lower Canines And Premolars Can Be Predicted By Measuring The Mesiodistal Width Of Lower Incisors, Clinicians Can Rely On The Meisodistal Tooth Width Of One Side If The Contra Lateral Was Missing And Separate Data Regarding Sex While Treating Egyptian Children Has To Be Used.