Relationship among malocclusion, number of occlusal pairs and mastication

This study evaluated the relationship among malocclusion, number of occlusal pairs, masticatory performance, masticatory time and masticatory ability in completely dentate subjects. Eighty healthy subjects (mean age = 19.40 ± 4.14 years) were grouped according to malocclusion diagnosis (n = 16): Class I, Class Class II-2, Class III and Normocclusion (control). Number of occlusal pairs was determined clinically. Masticatory performance was evaluated by the sieving method, and the time used for the comminute test food was registered as the masticatory time. Masticatory ability was measured by a dichotomic self-perception questionnaire. Statistical analysis was done by one-way ANOVA, ANOVA on ranks, Chi-Square and Spearman tests. Class II-1 and III malocclusion groups presented a smaller number of occlusal pairs than Normocclusion (p < 0.0001), Class I (p < 0.001) and II-2 (p < 0.0001) malocclusion groups. Class I, and III malocclusion groups showed lower masticatory performance values compared to Normocclusion (p < 0.05) and Class II-2 (p < 0.05) malocclusion groups. There were no differences in masticatory time (p = 0.156) and ability (&#967;2 = 3.58/p= 0.465) among groups. Occlusal pairs were associated with malocclusion (rho = 0.444/p < 0.0001) and masticatory performance (rho = 0.393/p < 0.0001), but malocclusion was not correlated with masticatory performance (rho = 0.116/p= 0.306). In conclusion, masticatory performance and ability were not related to malocclusion, and subjects with Class I, II-1 and III malocclusions presented lower masticatory performance because of their smaller number of occlusal pairs

Lower incisor dentoalveolar compensation and symphysis dimensions among Class I and III malocclusion patients with different facial vertical skeletal patterns

Objective: To compare lower incisor dentoalveolar compensation and mandible symphysis morphology among Class I and Class III malocclusion patients with different facial vertical skeletal patterns. Materials and Methods: Lower incisor extrusion and inclination, as well as buccal (LA) and lingual (LP) cortex depth, and mandibular symphysis height (LH) were measured in 107 lateral cephalometric x-rays of adult patients without prior orthodontic treatment. In addition, malocclusion type (Class I or III) and facial vertical skeletal pattern were considered. Through a principal component analysis (PCA) related variables were reduced. Simple regression equation and multivariate analyses of variance were also used. Results: Incisor mandibular plane angle (P < .001) and extrusion (P  =  .03) values showed significant differences between the sagittal malocclusion groups. Variations in the mandibular plane have a negative correlation with LA (Class I P  =  .03 and Class III P  =  .01) and a positive correlation with LH (Class I P  =  .01 and Class III P  =  .02) in both groups. Within the Class III group, there was a negative correlation between the mandibular plane and LP (P  =  .02). PCA showed that the tendency toward a long face causes the symphysis to elongate and narrow. In Class III, alveolar narrowing is also found in normal faces. Conclusions: Vertical facial pattern is a significant factor in mandibular symphysis alveolar morphology and lower incisor positioning, both for Class I and Class III patients. Short-faced Class III patients have a widened alveolar bone. However, for long-faced and normal-faced Class III, natural compensation elongates the symphysis and influences lower incisor position

Pseudo-Class III malocclusion treatment with Balters' Bionator.

The aim of this article is to show the use of the Balters' Bionator in pseudo-Class III treatment. The importance of differentiating between true Class III and pseudo-Class III is emphasized. The therapeutic results of a Balters' Bionator appliance are presented in three case reports of subjects in the mixed dentition. In this stage of development it is possible to correct an isolated problem. The use of the Bionator III in this kind of malocclusion enabled the correction of a dental malocclusion in a few months and therapeutic stability of a mesially-positioned mandible encouraging favourable skeletal growth

Perbedaan Rasio Ukuran Mesiodistal Gigi (Bolton) Pada Maloklusi Klasifikasi Angle di SMPN 1 Salatiga Jawa Tengah

Width of mesiodistal tooth is one of the factors that need to be considered in orthodontic treatment. Mesiodistal tooth size discrepancy of the arch could be the causes of malocclusion. To estimate normal size of mesiodistal tooth used the ratio Bolton i.e. Bolton Overall Ratio (BOR) and Bolton Anterior Ratio (BAR). The purpose of this research is to know the difference between Bolton Overall Ratio and Bolton Anterior Ratio in relation to the first molar permanent tooth malocclusion of Angle classification at SMPN 1 Salatiga Central Java. This is an analytical observational with cross sectional design survey. Samples consisted of 51 people with fully erupted and complete permanent dentition form first molar to first molar who were registered by purposive sampling methode. The difference of ratio Bolton on malocclusion of Angle classification were tested using tests analysis of one-way Anova post hoc Bonferroni. Results of the analysis of BAR value was ranged between 72.41 and 90.14, with mean value 79.95±3.30. The lowest BAR was in Class II and the highest was in Class III. The BOR value was ranged between 87.54 and 97.38, with mean value 92.78±2.04. The lowest BOR was in Class II and the highest was in Class III. The result of one-way Anova analysis showed the p value in BAR toward malocclusion was 0,030, and BOR toward malocclusion was 0,165. It can be concluded that there was a difference means of Bolton Anterior Ratio (BAR) to malocclusion, but there is no difference means of Bolton Overall Ratio (BOR) to malocclusion. Analysis using post hoc Bonferroni showed that BAR differences was only in Class I and Class II Angle classification of malocclusion

Using Networks To Understand Medical Data: The Case of Class III Malocclusions

A system of elements that interact or regulate each other can be represented by a mathematical object called a network. While network analysis has been successfully applied to high-throughput biological systems, less has been done regarding their application in more applied fields of medicine; here we show an application based on standard medical diagnostic data. We apply network analysis to Class III malocclusion, one of the most difficult to understand and treat orofacial anomaly. We hypothesize that different interactions of the skeletal components can contribute to pathological disequilibrium; in order to test this hypothesis, we apply network analysis to 532 Class III young female patients. The topology of the Class III malocclusion obtained by network analysis shows a strong co-occurrence of abnormal skeletal features. The pattern of these occurrences influences the vertical and horizontal balance of disharmony in skeletal form and position. Patients with more unbalanced orthodontic phenotypes show preponderance of the pathological skeletal nodes and minor relevance of adaptive dentoalveolar equilibrating nodes. Furthermore, by applying Power Graphs analysis we identify some functional modules among orthodontic nodes. These modules correspond to groups of tightly inter-related features and presumably constitute the key regulators of plasticity and the sites of unbalance of the growing dentofacial Class III system. The data of the present study show that, in their most basic abstraction level, the orofacial characteristics can be represented as graphs using nodes to represent orthodontic characteristics, and edges to represent their various types of interactions. The applications of this mathematical model could improve the interpretation of the quantitative, patient-specific information, and help to better targeting therapy. Last but not least, the methodology we have applied in analyzing orthodontic features can be applied easily to other fields of the medical science.</p

Prevalence of Malocclusion in Patients with Down’s Syndrome

U osoba s Downovim sindromom pronađene su znatne promjene koje zahvaćaju kranioorofacijalno područje. Ovim radom željela se utvrditi čestoća pojedinih vrsta ortodontskih anomalija u tih ispitanika. U tu svrhu pregledano je 112 ispitanika s citogenetski potvrđenom dijagnozom Downova sindroma. Svi ispitanici podvrgnuti su potpunom stomatološkom pregledu. Za određivanje ortodontske anomalije uporabljena je sljedeća klasifikacija: kompresije, anomalija preranoga gubitka, progenija, otvoreni zagriz, pokrovni zagriz, jednostrani unakrsni zagriz, te obostrani unakrsni zagriz. U 92% ispitanika postojala je ortodontska anomalija. Najzastupljenija je bila progenija, i to u 43,8% ispitanika. Zbijenost i jednostrani križni zagriz pronađeni su svaki od njih u 17% ispitanika. Obostrani križni zagriz pronađen je u 5,4% ispitanika, anomalija preranoga gubitka samo u 1% ispitanika, a pokrovni zagriz nije pronađen ni u jednome slučaju.Significant alterations of the cranio-orofacial region have been observed in subjects with Down’s syndrome. The aim of this study was to assess the frequency of particular orthodontic malocclusion in these subjects. A group of 112 subjects with cytogenetically confirmed diagnosis of Down’s syndrome was examined. All the subjects underwent a complete dental examination. The following classification was used to determine malocclusion of crowding, premature tooth loss, class III malocclusion, open bite, class II division 2 malocclusion, unilateral cross bite and bilateral cross bite. Clipper language programs were designed for data processing. Malocclusion was found in 92% of the subjects. Class III malocclusion was most frequently observed (43.8%). Crowding and unilateral cross bite were found in 15% of the subjects respectively. Bilateral cross bite was present in 5.4% of the subjects. Premature tooth loss was observed in only 1% of the subjects whereas class II division 2 malocclusion was not recorded in any of the subjects examined

Perawatan Maloklusi Klas III Dengan Reverse Overjet Menggunakan Alat Ortodontik Cekat Teknik Begg

Maloklusi klas III true skeletal merupakan kasus yang sulit dirawat dan mudah terjadi relaps. Perawatan ideal kasus ini memerlukan tindakan bedah, namun apabila hal tersebut tidak memungkinkan maka dilakukan perawatan kamuflase. Reverse overjet, atau gigitan terbalik, tipikal mempunyai penyimpangan posisi insisivus atas dan bawah akibat malrelasi maksila dan atau mandibula. Tujuan artikel ini adalah menyajikan perawatan ortodontik kamuflase menggunakan teknik Begg pada maloklusi ini. Pasien perempuan umur 24 tahun mengeluhkan gigi depan berjejal dan tidak nyaman untuk mengunyah makanan. Diagnosis kasus adalah maloklusi Angle klas III, hubungan skeletal klas III dengan protrusif bimaksilar, incisivus atas dan bawah retrusif, pergeseran median line rahang atas ke kanan, disertai edge to edge bite anterior, cross bite posterior dan openbite posterior. Pasien dirawat dengan pencabutan gigi premolar kedua atas,dan premolar pertama bawah untuk mengatasi kondisi kasus tersebut. Kesimpulan dua tahun setelah perawatan, tampak sudut interinsisal berkurang, reverse overjet terkoreksi, edge to edge bite, cross bite dan openbite terkoreksi.Treatment of Class III malocclusion with Reverse Overjet using Orthodontic Begg Technique. A true skeletal class III malocclusion is a difficult case to be treated as it can get easily relap. The ideal treatment of this skeletal types requires a surgery, but if it is not possible, an orthodontic camouflage can be conducted. Reverse overjet typically has upper and lower incisor position deviation due to the mesial position of the mandible in relation to the maxilla.The purpose of this article is to present camouflage orthodontic treatment using Begg orthodontic technique in Class III malocclusion case with reverse overjet. A 24 year-old female patient complained about her front teeth crowding and uncomfortable mastication. From the diagnosis, there was true dento skeletal class III malocclusion with bimaxilary protrusion, bidental retrusion and edge to edge bite. The lower incisors were shifted to the right. The posterior teeth were crossbite and openbite. The patient were treated with extraction of the right upper second premolars and lower first premolars.After 2 years of treatment, it is concluded that the interinsisal angle decreases and the reverse overjet, the edge to edge bite, the crossbite and the openbite are corrected as well

Lateral cephalometric analysis of asymptomatic volunteers and symptomatic patients with and without bilateral temporomandibular joint disk displacement

Few studies of dentofacial and orthodontic structural relationships relative to temporomandibular joint (TMJ) dysfunction have been reported. We undertook this investigation to determine any correlation of orthodontic and dentofacial characteristics with TMJ bilateral disc displacement. The population of patients was selected from a TMJ clinic where a control group of asymptomatic volunteers had been previously established and standardized. Differences in skeletal structural features were determined among three study groups: (1) asymptomatic volunteers with no TMJ disk displacement, (2) symptomatic patients with no TMJ disc displacement, and (3) symptomatic patients with bilateral TMJ disk displacement. Thirty-two asymptomatic volunteers without disk displacement (25 female, 7 male) were compared with the same number each of symptomatic patients without TMJ disk displacement and symptomatic patients with bilateral TMJ disk displacement. All subjects had undergone a standardized clinical examination, bilateral TMJ magnetic resonance imaging, and lateral cephalometric radiographic analysis. The groups were matched according to sex, TMJ status, age, and Angle classification of malocclusion. Seventeen lateral cephalometric radiographic cranial base, maxillomandibular, and vertical dimension variables were evaluated and compared among the study groups. The mean angle of SNB, or the intersection of the sella-nasion plane and the nasion–point B line (indicating mandibular retrognathism relative to cranial base), of the symptomatic patients-with-displacement group was significantly smaller than that in the asymptomatic volunteers and symptomatic patients without bilateral disk displacement (p \u3c 0.05). Female subjects showed smaller linear measurements of mandibular length, lower facial height, and total anterior facial height than male subjects in all three groups (p \u3c 0.05). The mean angle of ANB, or the intersection of the nasion–point A and nasion–point B planes (indicating retrognathism of mandible relative to maxilla), was significantly greater in female than in male subjects, in all groups (p \u3c 0.05). Symptomatic patients with bilateral disk displacement had a retropositioned mandible, indicated by a smaller mean SNB angle compared with that in asymptomatic volunteers and symptomatic patients with no disk displacement on either side. Lateral cephalometric radiographic assessment may improve predictability of TMJ disk displacement in orthodontic patients but is not diagnostic; nor does the assessment explain any cause-and-effect relationship. (Am J Orthod Dentofacial Orthop 1998;114:248-55.

Thin-plate spline analysis of mandibular morphological changes induced by early class III treatment: a long-term evaluation

To evaluate the long-term mandibular morphological changes induced by early treatment of class III malocclusion with rapid maxillary expansion (RME) and facial mask (FM)

Maxillary Advancement for Unilateral Crossbite in a Patient with Sleep Apnea Syndrome

This article reports the case of a 44-year-old male with skeletal Class III, Angle Class III malocclusion and unilateral crossbite with concerns about obstructive sleep apnea syndrome (OSAS), esthetics and functional problems. To correct the skeletal deformities, the maxilla was anteriorly repositioned by employing LeFort I osteotomy following pre-surgical orthodontic treatment, because a mandibular setback might induce disordered breathing and cause OSAS. After active treatment for 13 months, satisfactory occlusion was achieved and an acceptable facial and oral profile was obtained. In addition, the apnea hypopnea index (AHI) decreased from 18.8 preoperatively to 10.6 postoperatively. Furthermore, after a follow-up period of 7 months, the AHI again significantly decreased from 10.6 to 6.2. In conclusion, surgical advancement of the maxilla using LeFort I osteotomy has proven to be useful in patients with this kind of skeletal malocclusion, while preventing a worsening of the OSAS