scholarly journals Positional changes of the lower and upper anterior teeth after surgical correction of mandibular prognathism

2006 ◽  
Vol 63 (5) ◽  
pp. 457-460
Author(s):  
Miroslav Vukadinovic ◽  
Zoran Jezdic ◽  
Boban Anicic ◽  
Vladimir Sinobad ◽  
Nikola Mikovic
Keyword(s):  
Surgical Procedures ◽  
Surgical Correction ◽  
Occlusal Plane ◽  
Mandibular Ramus ◽  
Mandibular Prognathism ◽  
Anterior Teeth ◽  
Lower Jaw ◽  
Mandibular Plane ◽  
Surgical Corrections ◽  
Made In

Background/Aim. To establish the influence of surgical corrections of mandibular prognathism upon the position of the lower and upper anterior teeth (incisors). Methods. The changes in position of the lower and upper anterior teeth (incisors) after the surgical correction of mandibular prognathism were analyzed by means of x-ray craniometry in 183 patients (female: n = 110, male: n = 73) in which the correction had been made in accordance with the principles of sagital osteotomy of the mandibular ramus. There were 4 angular and 2 linear parameters determined in the pre- and postoperative tele-xray-pictures. The changes of these parameters were tested by means of the parametric statistic tests. Results. The performed surgical procedures did not cause statistically significant changes in the angular parameters. The changes of both linear parameters were thought highly statistically significant. Conclusion. Under the influence of the performed surgical procedures no changes were found in the position of anterior teeth (incisors) in relation to SN and the mandibular plane. They were actually moved along with the medium fragment of the lower jaw and that fragment was moved linearly backwards along the occlusal plane with a practically insignificant rotation in the cranial direction.

scholarly journals Evaluation of Prognostic Factors for Palatal Fistulas after Cleft Lip and Palate Surgery in a North-Western Romanian Population over a 10-Year Period

2021 ◽  
Vol 18 (14) ◽  
pp. 7305
Author(s):  
Daiana Antoaneta Opris ◽  
Horia Opris ◽  
Cristian Dinu ◽  
Simion Bran ◽  
Grigore Baciut ◽  
...  
Keyword(s):  
Prognostic Factors ◽  
Retrospective Study ◽  
Cleft Lip ◽  
Cleft Lip And Palate ◽  
Timing Of Surgery ◽  
Surgical Correction ◽  
County Hospital ◽  
Occurrence Rate ◽  
Surgical Corrections ◽  
North Western

Cleft lip and palate is the most frequent birth anomaly, with increasing reported rates of complications, such as palate fistulae. Current studies concerning the occurrence rate of cleft lip and palate (CLP) report 2 to 10 cases in 10,000 births. The purpose of this study was to investigate the existence of factors that could predict the occurrence of fistulae after cleft lip and palate surgery. A retrospective study was performed by collecting and analyzing data from all patients who were operated for cleft lip and/or palate in the Maxillo-Facial Department of the Emergency Clinical County Hospital of Cluj-Napoca, Romania, between 2010 and 2020. We investigated the existing evidence for possible links between the number of fistulae observed after the primary palatoplasty and the age at which the primary palatoplasty was performed, the sex of the patient, the type of cleft, the timing of the surgical corrections, and the presence of comorbidities. A total of 137 cases were included for analysis. A significant link between the number of fistulae and the type of cleft was found (with fistulae occurring more frequently after the surgical correction of CLP—p < 0.001). No evidence was found for the existence of significant links between the number of fistulae and the patient’s sex, the timing of surgery, or the presence of comorbidities. This study concluded that the incidence of palatal fistulae appears to be influenced by the type of cleft (CLP), but not by the sex of the patient, the timing of surgery, or the presence of comorbidities.

scholarly journals Dual-section versus conventional archwire for en-masse retraction of anterior teeth with direct skeletal anchorage: a finite element analysis

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Ryo Hamanaka ◽  
Daniele Cantarella ◽  
Luca Lombardo ◽  
Lorena Karanxha ◽  
Massimo Del Fabbro ◽  
...  
Keyword(s):  
Finite Element ◽  
Tooth Movement ◽  
Occlusal Plane ◽  
Skeletal Anchorage ◽  
Element Analysis ◽  
Posterior Teeth ◽  
Posterior Portion ◽  
Anterior Teeth ◽  
Retraction Force ◽  
En Masse Retraction

Abstract Background The aim of this study is to compare the biomechanical effects of the conventional 0.019 × 0.025-in stainless steel archwire with the dual-section archwire when en-masse retraction is performed with sliding mechanics and skeletal anchorage. Methods Models of maxillary dentition equipped with the 0.019 × 0.025-in archwire and the dual-section archwire, whose anterior portion is 0.021 × 0.025-in and posterior portion is 0.018 × 0.025-in were constructed. Then, long-term tooth movement during en-masse retraction was simulated using the finite element method. Power arms of 8, 10, 12 and 14 mm length were employed to control anterior torque, and retraction forces of 2 N were applied with a direct skeletal anchorage. Results For achieving bodily movement of the incisors, power arms longer than 14 mm were required for the 0.019 × 0.025-in archwire, while between 8 and 10 mm for the dual-section archwire. The longer the power arms, the greater the counter-clockwise rotation of the occlusal plane was produced. Frictional resistance generated between the archwire and brackets and tubes on the posterior teeth was smaller than 5% of the retraction force of 2 N. Conclusions The use of dual-section archwire might bring some biomechanical advantages as it allows to apply retraction force at a considerable lower height, and with a reduced occlusal plane rotation, compared to the conventional archwire. Clinical studies are needed to confirm the present results.

scholarly journals Anatomical Characteristics of the Masseter Muscle in Mandibular Prognathism

2021 ◽  
Vol 11 (10) ◽  
pp. 4444
Author(s):  
Ji Ho Yang ◽  
Dong Sun Shin ◽  
Jeong-Hun Yoo ◽  
Hun Jun Lim ◽  
Jun Lee ◽  
...  
Keyword(s):  
Masseter Muscle ◽  
Normal Group ◽  
Length Ratio ◽  
Mandibular Prognathism ◽  
Anatomical Characteristics ◽  
Mandibular Plane ◽  
Mandibular Body ◽  
The Difference

Mandibular prognathism causes functional and esthetic problems. Therefore, many studies have been conducted to understand its etiology. Following our previous study, which revealed that the major characteristic of the mandible with prognathism is the volume/length ratio of the mandibular body and condyle, we analyzed the volume and orientation of the masseter muscle, which inserts into the mandibular body, expecting that the difference in the size of the masseter muscle causes the difference in the mandibular size. This study compared the masseter muscle of the participants in the prognathic group to those in the normal group on the volume/length ratio and orientation. The masseter muscle ratios (volume/length); the angle between the superficial and deep head of the masseter muscle; and the three planes (the palatal, occlusal, and mandibular) were analyzed. A total of 30 participants constituted the normal group (male: 15, female: 15) and 30 patients, the prognathic group (male: 15, female: 15). The results showed that the volume/length ratio of the masseter of the normal group was greater than that of the prognathic group (p < 0.05). In addition, the orientation of both the superficial and deep head of the masseter of the participants in the normal group was more vertical with respect to the mandibular plane than that of the prognathic group (p < 0.05). We concluded that the mechanical disadvantage of the masseter muscle of the prognathic group is attributed to mandibular prognathism.

scholarly journals A Clinical Study to Correlate the Facial Form and Maxillary Central Incisor Tooth Form in Males and Females of Davangere Population

2016 ◽  
Vol 04 (03) ◽  
pp. 156-164
Author(s):  
Deepak Bansal ◽  
Shruti Sharma ◽  
Manjit Kumar ◽  
Amrit Khosla
Keyword(s):  
Facial Appearance ◽  
Central Incisor ◽  
Incisor Tooth ◽  
Maxillary Central Incisor ◽  
Anterior Teeth ◽  
The Face ◽  
Tooth Form ◽  
Males And Females ◽  
Selection Of ◽  
Made In

AbstractAn altered facial appearance is more difficult to face, than problems related to ill-fitting denture or eating. The selection of maxillary anterior teeth for complete denture has long posed problem in clinical practice and a controversy about the best method to employ still exists. An attempt is made in the present study to clinically correlate the face form with maxillary central incisor tooth form in males and females of Davangere population. In 1914, Leon William's projected the “the form method” where he classified facial forms as square, tapering, and ovoid. Maxillary central incisors were selected according to the facial forms.Of total 100 subjects four different tooth forms and face forms were evaluated. They are: square, ovoid, square-tapered, tapered. No significant correlation existed between face form in male and females. Females exhibited greater correlation between face forms and inverted tooth form but that correlation is not sufficient to serve as a guide for selection of anterior teeth.

Surgical correction of mandibular prognathism

1955 ◽  
Vol 8 (4) ◽  
pp. 359-365 ◽  
Author(s):  
Edward L. Flynn ◽  
William B. Swartz
Keyword(s):  
Surgical Correction ◽  
Mandibular Prognathism

scholarly journals Dentoskeletal and soft tissue changes associated with miniscrew anchorage in customized lingual orthodontics

2018 ◽  
Vol 47 (1) ◽  
pp. 84-95
Author(s):  
Dawei Liu ◽  
Jing Li ◽  
Feifei Lei ◽  
Xuedong Wang ◽  
Yanheng Zhou
Keyword(s):  
Soft Tissue ◽  
Clinical Effectiveness ◽  
Upper Lip ◽  
Lingual Orthodontics ◽  
Premolar Extraction ◽  
Anterior Teeth ◽  
Mandibular Plane ◽  
Space Closure ◽  
Tissue Changes ◽  
Soft Tissue Changes

Objectives The goal of this study was to analyze skeletal, dental, and soft tissue changes of patients treated with customized lingual systems and to evaluate the clinical effectiveness of miniscrew anchorage. Methods Nine upper first premolar extraction patients who were treated with customized lingual appliances were included in this study. Miniscrews were used for reinforcement of molar anchorage. Cephalometric films and study models were obtained before treatment (T1), after alignment (T2), and after treatment (T3). Treatment effects were analyzed by cephalometric radiographs and study models. Results The upper anterior teeth were retracted significantly at T2 and T3 (4.41 ± 4.14 mm and 5.51 ± 2.48 mm, respectively). During space closure, the upper first molars showed slight mesial movement (1.50 ± 1.97 mm). The intercanine width of the upper arch increased at T2 (1.59 ± 1.81 mm), but decreased at T3 (0.11 ± 1.00 mm). The sella-nasion-A, A-nasion-B, and mandibular plane angles were not significantly changed at T3. The upper lip showed continuous retraction at both T2 and T3 (1.40 ± 1.46 mm and 2.32 ± 2.48 mm, respectively). Conclusions By using miniscrew anchorage for lingual orthodontics, patients’ dental and soft tissue changes considerably improved and molar anchorage was reinforced.

Position of anterior teeth following surgical correction of prognathism

1984 ◽  
Vol 12 ◽  
pp. 33-35 ◽  
Author(s):  
Göz Gernot ◽  
Ulrich Joos ◽  
Wilfried Schilli
Keyword(s):  
Surgical Correction ◽  
Anterior Teeth
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