Aim: To determine the co-relationships of the root crown length and occlusal contacts in patients with Class-III skeletal relationship, anterior open-bite, and high mandibular plane angle. Materials and Methods: Study group consisted of 10 untreated Class-III patients with reverse over jet of minimum-2 or more and an anterior open-bite. Control group consisted of untreated patients with average 0-4 mm of over jet and overbite. Dental casts, orthopantomograms, and lateral cephalograms were recorded for measuring the root and crown lengths, occlusal contacts, and mandibular plane angle readings and were analyzed. Results: The root length and the root-crown ratios were reduced from incisors toward the pre-molars in the study group. Occlusal hypofunction was seen associated with the study group. Short dental roots were observed specifi cally with the anteriors. Conclusion: Patients with Class-III skeletal relationship, high mandibular plane angle, and an anterior open-bite have a tendency toward developing short dental roots that can be associated with occlusal hypofunction that is associated with the condition.