The twins are the miracle of fetal biology, medical reproductive challenge, the closest and most durable biological connection. The aim is to identify, evaluate and compare the type, number and location interjaw functional contacts in the intercuspal position of the mandible, with MZ monozygotic (identical) twins. Analysis of occlusal relationships in the most stable-intercuspal comparison was done on a sample of 60 identical twins, by 15 female and 15 male pairs, chronological ages 18 to 40, in which the means of articulation papers specific localization and distribution of contact relationships, in the region of the lateral teeth. Results of this study showed that in the lateral region, 57 respondents or 95%, has the modalities of occlusal relationships lump-ridges-marginal edge. Average more occlusal contacts identified in males (25.1) than in female twin pairs (19.1). Also, in male couples registered more three points (M: F = 7: 1), two points by gender is equal 24:12, and contacts at one point they outnumber men (22), compared to female respondents (18). Less Similarities than expected sameness, proving that the number, distribution and intensity of occlusal contacts in the mandible vary individually.
