Correct positioning of the canines after their retraction is of great importance for the function, stability and esthetics. Aim: Two case reports were presented to compare the efficiency of two techniques for canine retraction, segmented mechanics using 0.017 x 0.025 TMA T-loop vs sliding straight-wire mechanics usingelastomeric chains. Material and methods: The first case describes orthodontic treatment with 0.017 x 0.025 TMA T-loop whereas the second case describes a 9 mm canine retraction using elastomeric chains. Results: Depending on the type of malocclusion both techniques for canine retraction can be used. Post treatment results showed canine retraction with good anchorage control and no mesial movement of the molars.Conclusion: Both techniques provide an optimum rate of tooth movement and none of the methods can be considered superior in terms of tooth movement or side effects, including rotation, tipping, root resorption, anchorage loss, as well as associated pain.
Early loss of mandibular permanent molars with supraeruption of maxillary permanent molars is a common clinical finding causing functional posterior occlusion problems. Rehabilitation of the stomatognathic system often requires preprosthodontic intervention with molar intrusion which is one of the most difficult movements in orthodontic mechanics requiring efficient anchorage to achieve success.The aim of this study was to present two case reports, with orthodontic mini-implants used for molar intrusion as preprosthetic treatment, reducing the need for prosthetic crown reduction in patients with edentulous space discrepancy. With the aid of chain elastics, the force of intrusion passing through the center of resistance of the tooth, supraerupted maxillary molars were intruded approximately 0.5 mm per month. The intrusive tooth movement maintained the vitality of the intruded teeth and was not aggressive to the periodontal structures, did not cause root resorption and no change of the pulp flow was detected. In contrast to traditional orthodontics, mini-implants were demonstrated to be clinically efficient in providing sufficient anchorage against orthodontic forces. With these devices, using well-controlled magnitude and direction of the force, we reestablished successfully the functional posterior occlusion. By presenting these case reports, we emphasize the versatility of orthodontic mini-implants as a form of temporary anchorage devices (TADs) in the biomechanics of molar intrusion attempted to create interocclusal space for adequate prosthodontic restoration with osseointegrated implants and prosthesis.
Deep overbite as one of the most common malocclusion that can occur along with other associated malocclusions can be treated with several mechanisms.One such mechanics is true intrusion of anterior teeth. Deep overbite correction by intrusion of anterior teeth affords a number of advantages and is the desired treatment option for gummy smile correction, esthetics improvement as well as correction of mandible rotation in order to improve vertical dimension and to correct Class II malocclusion.This case report describes the orthodontic treatment of a 17-year-old patient diagnosed as severe Angle's Class II malocclusion with maxillary prognathism and skeletal deep bite, dental Class II division 1 malocclusion associated with 4 mm overbite, an increased overjet and excessive gingival display on smiling.After the analyses and due to the fact that the patient avoided surgical method for her malocclusion correction, our treatment plan in this case was alternative (camouflage) with upper premolars extraction.In the first phase we did 9 mm canine retraction with preserved vertical dimensions of upper incisors. In the second phase of our treatment we did incisor intrusion and en masse retraction of the incisors. Intrusion of upper incisors was done using a 0.017 × 0.025 Connecticut intrusion arch and 0.019 x 0.025 stainless steel as base archwire was used. Outstanding results were achieved with an improved facial profile, smile harmony and stable occlusal relationships.Through this case report we highlight the efficiency of Connecticut intrusion arch as а clinically manageable biomechanical system to optimize the orthodontic treatment. The use of good biomechanical principles helped us to achieve all treatment goals and objectives with minimal side effects.
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