MAXILLARY FIRST MOLAR DISTALIZATION WITH THE FROG APPLIANCE: A CASE REPORT
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1 MAXILLARY FIRST MOLAR DISTALIZATION WITH THE FROG APPLIANCE: A CASE REPORT Eduard Radu Cernei*, Laura Gavrila, Dana Cristiana Maxim, Veronica Pintiliuc- Serban, Irina Nicoleta Zetu Grigore T. Popa" University of Medicine and Pharmacy - Iași, Romania, Faculty of Dentistry, Department of Dentoalveolar and Oro-Maxillofacial Surgery *Corresponding author: Eduard Radu Cernei, DMD, PhD student Grigore T. Popa" University of Medicine and Pharmacy - Iași, Romania; cerneiradu@yahoo.com ABSTRACT Traditional upper molar distalization techniques require patient co-operation with the headgear or elastics. Recently, several different intraoral procedures have been introduced to minimize the need for patient cooperation. Distalizing maxillary first molars is often an objectiv in treatment plans inolving Class II malocclusions and is sometimes indicate for non-extraction treatments with maxillary crowding. Pacient compliance has become a factor in choosing effective orthodontic appliances. In recent years various appliances that do not require patient compliance have been developed to drive maxillary molars distally. Some of these appliances produce unwanted tipping of the maxillary molars and a tendency to create crossbites if not properly adjusted. Therefore we want to present a case that presented in the clinic of Orthodontics and dento-facial orthopedics in the Ambulatory Pediatric Dentistry in Iasi. L.S. patient aged 12 years presenting for aesthetic and functional disorders. On examination extraoral facial changes occur hyperdivergent profile. Clinical examination reveals intraoral Angle Class I molar malocclusion, anterior deep bite, mesial inclination of the lower left permanent molar. Upper canines teeth are erupting bucally, due to lack of space. OPT examination and anamnesis reveled reduction the space for the lower left second premolar and for the lower right canin probabily due to premature loss of second primary molar and primary canine. Indicate a slight lateral cephalometric skeletal Class II ( ANB inv. = 5.040) with a hyperdivergent profile GoGn/SN=360.We wanted a non extraction treatment except the 3rd molars.. The treatment plan included distalization of the upper first molars bilaterally followed by a palatal expander and a full fixed appliance therapy. For the lower arch we applied a lip-bumper for moderate arch expansion and for lower molars distalization. For the upper molar distalization, a new system, the Frog Appliance, was constructed and applied. Lateral cephalometric radiographs were used to evaluate the treatment results. It was obtained an over distalization of the first molars after 10 mouths of treament because the patient missed the subsequent checks. The lower lip-bumper was not carried. According to the results of the cephalometric evaluation, a nearly bodily distal molar movement was attained. It was reapplied lip bumper and a palatal expander. The patient is still in treatment. In conclusion, the Frog Appliance was found to be effective, non-invasiv appliance for achieving bilateral molar distalization, but the patients should be more motivated to come to check up. Keywords: Frog appliance, molar distaliyation INTRODUCTION Traditional upper molar distalization techniques require patient co-operation with the headgear or elastics. Recently, several 31
2 different intraoral procedures have been introduced to minimize the need for patient co-operation [1]. Distalizing maxillary first molars is often an objective in treatment plans involving Class II malocclusions and is sometimes indicate for non-extraction treatments with maxillary crowding [2]. Patient compliance has become a factor in choosing effective orthodontic appliances. In recent years various appliances that do not require patient compliance have been developed to drive maxillary molars distally. Some of these appliances produce unwanted tipping of the maxillary molars and a tendency to create crossbites if not properly adjusted [3]. Intra-oral distalization techniques such as pendulum appliance, Jones Jig, and distal jet are frequently used in this fashion. Many clinical studies substantiated the effectiveness of these appliances [4-14]. A new system - Frog Appliance, Forestadent, Pforzheim, Germany- for upper molar distalization has been developed. The purpose of this article is is to present a clinical situation of this system in the treatment of maxillary crowding. CLINICAL CASE Therefore we want to present a case that presented in the clinic of Orthodontics and dento-facial orthopedics in the Ambulatory Pediatric Dentistry in Iasi. L.S. patient aged 12 years presenting for aesthetic and functional disorders. The extra-oral examination (fig. 1) revealed an oval shape of the face, a mesocephalic head shape, a mesoprosopic face, a mild convex profile. Facial changes occur hyperdivergent profile and an acute naso-labial angle. The smile was unaesthetic. The patient showed a good range of mandibular movements and no temporomandibular-joint symptoms. Figure 1. Extraoral aspect - before treatment Clinical examination (fig. 2) reveals intraoral Angle Class I molar malocclusion, anterior deep bite, mesial inclination of the lower left permanent molar. Upper canines teeth are erupting bucally, due to lack of space. The space for the canine alignment was decreased. Both upper and lower arches were asymmetric. The discrepancy in the upper arch was 9 mm and in the lower arch was 11 mm. OPG examination and anamnesis revealed reduction the space for the lower left second premolar and for the lower right canin probabily due to premature loss of second primary molar and primary canine. Also, are seen only wisdom tooth in quadrant IV (fig. 3). Cephalometric measurements of the patient indicate a slight skeletal Class II ( 32
3 ANB inv. = 5.040) with a hyperdivergent profile GoGn/SN=360 (Fig. 3). Figure 2. Intraoral aspect- before treatment Figure 3. OPG and Cephalometry- before treatment TREATMENT ALTERNATIVES The patient s chief concern was the upper and the lower arch crowding. There were two treatment alternatives for this case because the patient did not want to wear an extraoral appliance: (1) distalization of upper and lower molars using an intraoral appliance [15] or (2) extraction of four first premolars, and fixed orthodontic treatment [16]. Figure 4. Intraoral aspect- after application of orthodontic appliances 33
4 The patient accepted a non extraction treatment except the 3rd molars. The treatment plan included distalization of the upper first molars bilaterally followed by a palatal expander and a full fixed appliance therapy. For the lower arch we applied a lipbumper for moderate arch expansion and for lower molars distalization. For the upper molar distalization, a new system, the Frog Appliance (fig. 4) was constructed and applied. RESULTS After 10 months of treatment it was obtained an over distalization of the first molars because the patient missed the subsequent checks. Lip bumper was not worn enough as it was lost. Basically the patient returned to the clinic because of the 25 composite fell. In the upper arch has been obtained as a surplus of +2.2 mm. In the lower arch space deficiency reached at -9.1 mm (fig. 5). Figure 5. Intraoral aspect- after 10 months of treatment Figure 6. OPG and Cephalometry - 10 months of treatment Figure 7. Intraoral aspect - after 10 months of treatment 34
5 Table 1. Cephalometric measurements of the patient Results Unit Minimum Maximum Initial value After distalization value SNA SNB ANB SND II SN-OcP SN-GoGn Max1-NA Max1-SN Mand1-NB u-NA mm l-NB mm Pog-NB mm Holdaway ratio mm S-L mm S-E mm u-PTV mm l-APog mm u-APog mm Lateral cephalometric radiographs were used to evaluate the treatment results. After distalization, cephalometric analysis using Onyx Ceph R software revealed that the maxillary first molars were moved 3.09 mm (according to PTV) and tipped 30 (according to ANS/ PNS) distally. As for anchorage loss, the upper central incisors exhibited a mesial movement of 2 mm, associated with a proclination of 5 (Table 1, fig. 6). It was reapplied lip bumper and a palatal expander. A segmentar fix orthodontic was applied. The patient is still in treatment (fig. 7). DISCUSSIONS Several methods exist for the correction Class I with crowding or Class II malocclusion. It was therefore made a classification appliances according to the degree of acceptance by the patient.- compliance or noncompliance aplliances-. Compliance-dependent appliances such as headgear or removable plate appliance were traditionally used for upper molar distalization in treatment of Class II malocclusions [17]. For over a decade, various innovative noncompliance intraoral molar distalization appliances have been described. These appliances derive their anchorage in an intramaxillary manner and act only in the maxillary arch to move molars distally: eg, the pendulum appliance, the sectional jig assembly, the distal jet, the Keles slider[4-14]. One of the important goals of molar distalizing therapy is to obtain bodily tooth movement of the molars with minimal rotation and distal inclination [18]. The Frog 35
6 appliance was positioned approximately 10 to 12 mm apically to the occlusal surface of the maxillary molar with parallel orientation to the occlusal plane in our case. In this manner, a vector of effective force passing through the centre of resistance of the first molar was obtained [19]. In the current case, the correction of the Class I molar with crowding originally wanted the permanent molars distalization thus obtaining the necessary space arch alignment of ectopic canines. In the lower arch still opted for molars distalization using lip-bumper. However, the patient presented proved noncompliant, missing the routine checks-up. It obtained a distalization 3 mm and 3 degrees of distal tip of upper first molars [20]. Previous studies have indicated that the pendulum appliance produces a molar distalization between 3.14 and 6.1 mm and the distal jet appliance a molar distalization of mm. The distal jet produces a molar distal tip of degrees far away from pendulum whose distal tip varies from 8.4 to 15.7 degrees [3,4,11,13]. And in terms of loss of anchorage results are similar. In the case presented was obtained a loss of anchorage translated by mezialization of the upper incisors by 2 mmand a tip forward of 5 degrees. Mehmet Bayram in his previous article obtained similar results - an incisors mesial movement of 2 mm, associated with a proclination of 4 degrees [21]. CONCLUSION In conclusion, the Frog Appliance was found to be effective, non-invasiv appliance for achieving bilateral molar distalization, but the patients should be more motivated to come to check up, not transforming thus a non compliance-dependent appliances in an ineffective one. REFERENCES 1 Keles A, Erverdi N, Sezen S. Bodily distalization of molars with absolute anchorage. Angle Orthod 2003;73: Ghosh J, Nanda RS. Evaluation of an intraoral maxillary molar distalization technique. Am J Orthod Dentofacial Orthop 1996;110: Bolla E, Muratore F, Carano A, Bowman S J. Evaluation of maxillary molar distalisation with the distal jet: a comparison with other contemporary methods Angle Orthod 2002, 72 : Byloff FK, Darendeliler MA. Distal molar movement using the pendulum appliance. Part 1: clinical and radiological evaluation. Angle Orthod 1997;67: Bussick TJ, McNamara JA Jr. Dentoalveolar and skeletal changes associated with the pendulum appliance. Am J Orthod Dentofacial Orthop 2000;117: Haydar S, Uner O. Comparison of Jones jig molar distalization appliance with extraoral traction. Am J Orthod Dentofacial Orthop 2000;117: Brickman CD, Sinha PK, Nanda RS. Evaluation of the Jones jig appliance for distal molar movement. Am J Orthod Dentofacial Orthop 2000;118: Carano A, Testa M. The distal jet for upper molar distalization. J Clin Orthod 1996;30: Ngantung V, Nanda RS, Bowman SJ. Posttreatment evaluation of the distal jet appliance. Am J Orthod Dentofacial Orthop 2001;120: Bolla E, Muratore F, Carano A, Bowman SJ. Evaluation of maxillary molar distalization with the distal jet: a comparison with other contemporary methods. Angle Orthod 2002;72: Keles A, Pamukcu B, Tokmak EC. Bilateral maxillary molar distalization with sliding mechanics: keles Slider. World J Orthod 2002;3: Kinzinger GS, Fritz UB, Sander FG, Diedrich PR. Efficiency of a pendulum appliance for molar distalization related to second and third molar eruption stage. Am J Orthod Dentofacial Orthop 2004;125: Gulati S, Kharbanda OP, Parkash H. Dental and skeletal changes after intraoral molar distalization 36
7 with sectional jig assembly. Am J Orthod Dentofacial Orthop 1998;114: Cetlin NM, Ten Hoeve A. Nonextraction treatment. J Clin Orthod 1983;17: Janson G, Brambilla AC, Henriques JFC. Class II treatment success rate in 2- and 4-premolar extraction protocols, Am. J. Orthod 2004; 125(4): Cangialosi TJ, Meistrell ME Jr, Leung MA, Ko JY. A cephalometric appraisal of edgewise Class II nonextraction treatment with extraoral force. Am J Orthod Dentofacial Orthop 1988; 93: Kim SJ, Chun YS, Jung SH, Park SH. Three dimensional analysis of tooth movement using different types of maxillary molar distalization appliances. Korean J Orthod 2008;38: Worms F W, Isaacson R J, Speidel T M 1973 A concept and classifi cation of centers of rotation and extraoral force systems. Angle Orthodontist 43 : Papadopoulos M A, Mavropoulos A, Karamouzos A 2004 Cephalometric changes following simultaneous first and second maxillary molar distalization using a non-compliance intraoral appliance. Journal of Orofacial Orthopedics 65 : Bayram M, Nur M, Kilkis D. The frog appliance for upper molar distalization: a case report. Korean J Orthod 2010;40(1):
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