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Introduction: The goal of Orthodontic treatment is toimprove the patient’s life through enhancement of Dentofacialfunctions and esthetics. Paradigms have started to shift inOrthodontic world since the introduction of mini-implantsin the anchorage armamentarium. So the present study wasundertaken to analyse and compare the amount of Intrusionin maxillary anterior teeth segment using one and twominiscrews, while paying an utmost attention to patientscomfort and esthetics during the treatment.Material and Methods: The sample consisted of 20 subjectswith deep overbite and complete root formation with increasedincisor show. Lateral cephlogram and P.A Cephalogram wererecorded before placement of implant. Sample was furtherdivided in to two groups, Group I (Implant group one implantis placed between maxillary central incisors and two implantsplaced between second premolar and first molar) and GroupII (Implant Group with Power arms, one implant is placedbetween maxillary central incisor and power arms fabricatedon first molar bilaterally). Clinical evaluation of intrusion wasrecorded on every six weeks.Results: The mean intrusion achieved is 0.28mm per 6weeks interval of time in both groups suggesting there is nodifference in amount of intrusion achieved in both groups withp value of 0.697 which is statistically non-significant. Changein Frankfort mandibular plane angle was observed with GroupI and Group II.Conclusion: On the base of study it was concluded thatimplant and power arm is better choice for intrusion inmaxillary anterior segment for correction of deep overbite andcorrection of gummy smile with minimal effect on posteriorsegment
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Objective To investigate the value of bone mineral density and bone resorption markers around the mini-screw implant in the orthodontic treatment.Methods 178 orthodontic patients were prospectively collected.According to the organization condition around the mini-screw implant loaded,all patients were assigned into stable group (n =160) and loose group (n =18).The levels of interleukin-1 β (IL-1 β) and matrix metalloproteinase-9 of the liquid around the mini-screw implant were detected at 1,2 and 3 months after loading.Moreover,the bone miner al density around the mini-screw implant before and after loading were studied as well.Results Compared with the stable group,the loose groups at 1,2 and 3 months after loading got significantly higher levels of IL-1β [(35.48 ± 4.39)pg/mL vs.(29.48 ±3.92)pg/mL,t =3.348,P =0.004;(41.45 ±5.39)pg/mL vs.(26.29 ±4.12)pg/mL,t =6.493,P =0.000;(54.39 ± 12.82) pg/mL vs.(23.58 ± 3.62) pg/mL,t =11.589,P =0.000].Compared with the stable group,the loose group at 1,2 and 3 months after loading got significantly higher levels of MMP-9[(5.68 ± 3.54) ng/mL vs.(1.74 ± 0.88) ng/mL,t =8.496,P =0.000;(6.84 ± 2.82) ng/mL vs.(1.25 ± 0.62) ng/mL,t =9.835,P =0.000;(9.84 ± 4.39) ng/mL vs.(1.21 ± 0.58) ng/mL,t =12.548,P =0.000].Compared with the sta ble group,the loose group got significantly lower levels of bone mineral density of maxillary bones around the miniscrew implant before and at 3 months after loading[(620.48 ±67.82) HU vs.(694.39 ±84.58)HU,t =2.459,P =0.015;(597.39 ± 58.93) HU vs.(693.59 ± 83.29) HU,t =2.909,P =0.008].Conclusion The decrease of bone mineral density around the mini-screw implant is related to the loosening of the mini-screw implant,and IL-1 β and MMP-9 of the surrounding fluid can reflect the peripheral inflammation.
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This case report describes the orthodontic treatment performed for open bite caused by internal derangement (ID) and osteoarthritis (OA) of the temporomandibular joint (TMJ). A Japanese woman, aged 31 years and 11 months, referred to our department by an oral surgeon had an open bite with clockwise rotation of the mandible and degeneration of the condyle. The overbite was corrected through intrusion of the maxillary and mandibular molars using mini-screw implants to induce counterclockwise rotation of the mandible. Then, the mandibular second premolars were extracted and comprehensive orthodontic treatment was performed to establish a Class I molar relationship with distalization of the maxillary arch and to eliminate anterior crowding. Following treatment, her facial profile improved and a functional and stable occlusion was achieved without recurrence of the TMJ symptoms. These results suggest that orthodontic intrusion of the molars is one of the safer and less stressful alternatives for the management of open bite due to degeneration of the condyles caused by ID and OA of TMJ.