Bilateral flush terminal plane molar relationship (80.3%) was the most prevalent molar relation while unilateral flush terminal plane with mesial step (2.3%) was the least common both in males and females.
The flush terminal plane relation was frequently found in our population (80.3%); however distal step (10.7%) was more frequent than mesial step (3.6%).
However, mesial step was found to be the norm for completed primary dentition rather than flush terminal plane [22-24].
Type of molar relationship Sex Total Male Female Flush terminal Count 916 916 1832 plane--bilateral % within SEX 81.6% 79.0% 80.3% Distal step--bilateral Count 97 148 245 % within SEX 8.6% 12.8% 10.7% Mesial step--bilateral Count 43 39 82 % within SEX 3.8% 3.4% 3.6% Unilateral flush terminal Count 37 30 67 plane with distal step % within SEX 3.3% 2.6% 2.9% Unilateral flush terminal Count 28 25 53 plane with mesial step % within SEX 2.5% 2.2% 2.3% Unilateral mesial step with Count 0 0 0 distal step % within SEX 0.0% 0.0% 0.0% Posterior cross-bite Count 1 1 2 % within SEX 0.1% 0.1% 0.1% Total Count 1122 1159 2281 % within SEX 100.0% 100.0% 100.0% [chi square] = 11.179, P = 0.025, significant.
(MS)--the distal surface of the mandibular primary second molar is located in a more mesial position relative to the distal surface of the maxillary primary second molar; and
Concerning the different types of molar relationships in deciduous and permanent dentition (table 5), right and left mesial step
occurred more frequently, especially in boys, although the differences were not statistically significant in comparison to the girls (p = 0.122 in right molar relationship and p = 0.252 in left molar relationship).
In terms of the molar relationship; flush terminal plane was present in 75% of the children followed by mesial step (13.9%) and distal step (11.1%).
In Is aeli preschool children5, flush terminal occlusion was reported to be 2.4 times more frequent than the mesial step occlusion.
Kabue et al9 found that the straight terminal plane of the deciduous second molars was presented in 53% of the Kenyan children, mesial step in 43% and distal step occlusion in one percent; he concluded that more than half of the children were found to have some form of malocclusion.
Farsi, and Salama13 conducted a study among 3-5-year-old Saudi children, finding that majority of the children had flush terminal relationship and Class I canine relationship, followed by mesial step and class II rela-tionship.
In a study conducted by Abu Alhaija, and Qudeimat14 among 3-6 years Jordanian children, mesial step molar relationship was found in 47.7% of children followed by flush terminal molar relationship in 37% and distal step in 3.7%.
There was also the presence of anterior crossbite with mesial step
molar relation on both sides.