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OWJE Abstracts Volume 66 (2007): English abstracts of papers published in Japanese in the Orthodontic Waves - Japanese Edition
orthodontic waves 66 (2007) 157–160
available at www.sciencedirect.com
journal homepage: www.elsevier.com/locate/odw
ODWJE Abstracts Volume 66 (2007): English abstracts of papers published in Japanese in the Orthodontic Waves – Japanese Edition, official Journal of the Japanese Orthodontic Society (ISSN 1349-0303)
Original Article
Case Report
Study on the distribution of cephalometric landmarks Research for datum lines make landmark area narrow down
A case of Pierre Robin sequence and its assessment of craniofacial development
Shinichi Hayakawa, Yuji Fuwa, Shigemi Goto
Toshiaki Usui, Setsuko Uematsu, Saburo Kurihara
Department of Orthodontics, School of Dentistry, AichiGakuin University Orthod Waves-Jpn Ed 2007; 66(1): 1–16
Department of Orthodontics, Matsumoto Dental Universityy Orthod Waves-Jpn Ed 2007; 66(1): 17–25
Abstract: There have been many studies of skeletal patterns and cranio-facial development by investigating cephalometric measurement values, but very few papers about coordinate data. This paper discusses an efficient method for plotting cephalometric landmarks on computer by investigating their distribution. To grasp the range of cephalometric landmarks, we investigated 50 cephalometric films of female skeletal III cases in IIIA stage. The following results and conclusions were obtained in this study. 1) It was difficult to narrow down the area for landmarks by using FH at S because of their wide distribution. 2) The area of landmarks was convergent or spread by leveling volume and superimposing on some cephalometric reference planes. N-Ba plane was the most efficient reference plane to narrow down the area for many landmarks. 3) The maxillary reference plane was the best to narrow down the area for landmarks related to denture pattern. 4) Combined use of reference planes using rejection ellipse was effective to narrow down the area for all landmarks. This appears very effective for plotting cephalometric landmarks and finding plotting errors. 1344-0241/$ – see front matter doi:10.1016/S1344-0241(07)00166-5
Abstract: This case report describes the non-surgical management of a patient with Pierre Robin sequence by accelerating mandibular growth and using a fixed edgewise appliance. The patient presented with class II malocclusion, deep bite, skeletal class II with retrognathia, and a high mandibular angle. The maximum occlusal force of this patient was higher than the average score of individuals belonging to the same age group. Intrusion of the upper incisors and flattening of the curve of Spee were planned for stimulating the growth of the mandible. Good facial balance was established as a result of significant growth of the mandible. There was progressive improvement in the facial appearance and a stable occlusion was also obtained. Clinical Hint Impacted lower first molar treated by means of orthodontic techniques with a pulley-type appliance for traction Nobuyuki Funabiki, Yukiko Naganawa*, Masahiro Kariya, Takashi Naganawa, Takamasa Kondo**, Shigemi Goto** Tsushima-City Ama-Tsushima Tanpopo Orthodontic Clinic * Nagoya-City Aichi Matsuba-kouen Orthodontic Clinic ** Department of Orthodontics, Aichi-Gakuin University School of Dentistry
158
orthodontic waves 66 (2007) 157–160
Orthod Waves-Jpn Ed 2007; 66(1): 26–32 Abstract: Two cases of an impacted lower first molar, which is very rare, are presented. Case 1: A boy aged 10 years 4 months, had scissors bite with the left side of the molar; 36 was impacted. Eruption of 37 preceded that of 36. Case 2: A boy aged 9 years 2 months, had cross bite with incisors; 46 was impacted and had a curved root. Just as in case 1, eruption of 47 preceded that of 46. These impacted teeth were treated by means of surgical and orthodontic techniques with a pulley-type appliance for traction. The teeth were successfully arranged into dentition with no relapse. Original Article Growth changes of the nasomaxillary complex in anterior crossbite cases after restoration of nasal respiratory function Makoto Kikuchi Kikuchi Orthodontic Office Orthod Waves-Jpn Ed 2007; 66(2): 63–71 Abstract: Moss’ Functional Matrix Theory states that nasal respiratory function is one of the factors influencing the growth of the nasomaxillary complex. It has also been suggested that there may be an association between an anterior crossbite with impaired nasal respiration and maxillary hypoplasia. This study included 53 patients with anterior crossbite due to maxillary hypoplasia suffering from impaired nasal respiration to observe their natural growth following referral to otolaryngologists for restoration of nasal respiration. Lateral cephalograms were taken to analyze changes in cephalometric measurements before and after improvement in nasal respiration and to compare with 21 normal nasal breathers. Patients with spontaneous correction of anterior crossbite showed increasing tendencies for ANS-PNS distance and convexity and labial tipping of the upper incisors. In patients without spontaneous correction of anterior crossbite, both ANS-PNS distance and convexity tended to increase but the anterior teeth were still in crossbite due to deep overbite. The maxilla remained hypoplastic with little increase in ANS-PNS distance or convexity in patients without improvement of nasal respiratory function. These results indicate a possibility of restoring nasal respiratory function and promoting the growth of the nasomaxillary complex through elimination of nasal respiratory disturbances. Original Article Prediction of lateral soft tissue profile following orthognathic surgery for mandibular prognathism Kohei Hida, Toshiko Sekiya, Hajime Tokiwa, Yoshiki Nakamura, Ayao Hirashita Department of Orthodontics, School of Dental Medicine, Tsurumi University Orthod Waves-Jpn Ed 2007; 66(2): 72–80
Abstract: The purpose of this study was to predict the posttreatment position of certain soft tissue points from the pretreatment conditions in surgical-orthodontic patients using a multiple linear regression analysis. A cephalometric analysis was made using pretreatment and posttreatment lateral cephalograms of 51 mandibular prognathic adult females treated with orthodontics combined with sagittal splitting ramus osteotomy. The following results were obtained: 1. Posterior displacement of the chin region and posteroinferior displacement of the upper and lower lips were observed after orthognathic surgery. 2. Accompanied with high multiple correction coefficients and multiple coefficients of determination, the functions obtained from multiple linear regression analysis enabled us horizontally and vertically to predict the posttreatment position of the soft tissue points. 3. It was shown that the horizontal and vertical positions of the upper incisors posttreatment can affect the profiles of the chin region and upper and lower lips. In conclusion, the soft tissue profile is very likely to be predicted from the pretreatment conditions using a multiple regression model. In addition, the present study suggests that positioning the upper incisors in the presurgical orthodontic treatment plays a key role in determining the posttreatment soft tissue profile. Original Article Three-dimensional diagnostic imaging of the alveolar bone using dento-maxillofacial cone-beam X-ray CT - Dimensional accuracy and reproducibility of images of the alveolar bone Yoko Kataoka, Haruhisa Nakano, Yukiko Matsuda*, Kazuyuki Araki*, Tomohiro Okano*, Koutaro Maki Department of Orthodontics, School of Dentistry, Showa University * Department of Dental Radiology, School of Dentistry, Showa University Orthod Waves-Jpn Ed 2007; 66(2): 81–91 Abstract: Orthodontic treatment plans should be established after assessing the three-dimensional morphology of the alveolar bone. Cone-beam X-ray CT (CBCT) in the dentomaxillofacial region has recently been developed and used for three-dimensional diagnostic imaging of the alveolar bone. In this study, the dimensional accuracy on MPR images, image indication conditions appropriate for the alveolar bone, and reproducibility of image of its cross-sectional area were evaluated so as to clarify the usefulness of CBCT. Materials were four dry human mandibular bones and four unilaterally excised human mandibular bones. Metal balls were applied to the buccal coronal area of each tooth and the alveolar bone, supposing the tooth axis, and CT was taken. From the measurements obtained, I) dimensional accuracy, II) establishment of window levels, and III) reproducibility of the cross sectional area were evaluated. As a result,
orthodontic waves 66 (2007) 157–160
I. measurements of the distance between markers showed no significant differences between actual measurements and CT measurements both in the dry and excised human mandibular bones (p < 0.05); II. the appropriate MPR image indication conditions for the alveolar bone were window width of 2,000 and window level of 500; III. MPR images almost appropriately reproduced the cross sectional area. Our results suggest that the dimensional accuracy of MPR images was good by CBCT, and thin bones such as the alveolar bone could be observed by setting appropriate image indication conditions. Original Article Three-dimensional analysis of smile movement using high speed cameras for the subjects with normal occlusions and jaw deformities Takako Ishikawa, Yoko Saito*, Shima Muraoka, Kitahara**, Hideki Ioi**, Akihiko Nakashima**
Toru
Division of Oral Health, Growth & Development, Graduate School of Dental Science, Kuyshu University * Department of Dental Anesthesia, Anesthesia and Critical Care Center, Kagoshima University Medical and Dental Hospital ** Division of Oral Health, Growth & Development, Faculty of Dental Science, Kuyshu University Orthod Waves-Jpn Ed 2007; 66(2): 92–105 Abstract: We investigated the influences of malocclusions and jaw deformities on the smile motion. The subjects consisted of a control group of 20 subjects with normal occlusions and 10 orthodontic patients with jaw deformities. Six measuring markers on the face (upper lip, lower lip, rightand-left angulus oris, right-and-left cheeks) and 3 reference markers on the upper face were placed on the skin. The motion of the measuring markers was detected automatically by the 3 high-speed cameras during smiling phase and analyzed 3 dimensionally by means of the 3-dimension operation analysis software. The head was not stabilized during the measurements and the motion of the head was canceled by the movement of triangle comprised of three reference markers. Measurements were conducted 3 times for each subject and regarded the mean values as the representative values. The results showed that the lower lips for the jaw deformity patients showed larger displacements to the downward and lateral directions compared with the control subjects even though these showed small displacements to the backward. The upper lip, angulus oris, and cheeks showed small displacements as a whole, especially to the upward and lateral directions. The recovery movements after smiling phase for the jaw deformity patients tended to delay compared with the control subjects. Thus, the features of lower face for the jaw deformity patients showed different movements compared with those of the control group. These results suggest that the morphological abnormity might prevent to express the natural smile.
159
Case Report Orthodontic treatment of an Angle Class III crowding case with TMD: Comparison of a jaw movement between pre-and posttreatment Yasuyo Sugawara, Shingo Kuroda, Teruko Takano-Yamamoto*, Takashi Yamashiro Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University * Division of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Tohoku University Orthod Waves-Jpn Ed 2007; 66(2): 106–112 Abstract: The present report describes orthodontic treatment of a female patient with a moderate anterior crowding and anterior and posterior crossbites. She had history of closed lock in the temporomandibular joint (TMJ), which was released with stabilization sprint. Magnetic resonance imaging (MRI) of the right TMJ demonstrated anterior disk displacement with reduction. The crossbites and moderate crowding were eliminated by orthodontic treatment involving with lateral expansions of the upper and lower dental arches and subsequent non-extraction edgewise therapy. A 6-degreeof-freedom jaw movement recording system revealed that impaired jaw movement presumably caused by the crossbite and the crowding was almost corrected by the dental arch alignment. After a retention period of 33 months, the patient showed stable occlusion. Original Article Movements of mandibular condyle on working side and activities of masseter and lateral pterygoid muscles during masticatory-like jaw movements induced by electrical stimulation on the corticalmasticatory area in rabbits Takumi Morita, Takuya Fujiwara*, Takefumi Negoro*, Chikayuki Kurata**, Hisanobu Maruo**, Kenichi Kurita**, Shigemi Goto*, Katsunari Hiraba Department of Physiology, School of Dentistry, Aichi-Gakuin University * Department of Orthodontics, School of Dentistry, AichiGakuin University ** 1st department of Maxillofacial Surgery, School of Dentistry, Aichi-Gakuin University Orthod Waves-Jpn Ed 2007; 66(3): 123–133 Abstract: We studied the relationship between movements of the mandibular condyle and activities of the masseter and lateral pterygoid muscles during electrically induced fictive mastication. Since there is a delay from the generation of action potentials of muscles to the onset of actual tension, we analyzed the temporal relationship between the electromyogram (EMG) and the jaw movements while taking this delay quantitatively into consideration. The incisal point made grind-type movements on the frontal plane with large lateral movements extending into the contralateral side. During the grind-type incisal movements, the condyle on the working side showed characteristic
160
orthodontic waves 66 (2007) 157–160
movements of three phases on the sagittal plane: posterosuperior in closing phase, anteroinferior in occlusal phase and anterior in opening phase. The lateral pterygoid muscle on the working side showed a bimodal EMG activity coincident with the middle stage of the occlusal phase and the opening phase. Taking the delay from the generation of EMG to the onset of muscle tension into consideration, we consider that the activity represented in the early peak was responsible for the lateral jaw movements extending into the contralateral side during the end stage of the occlusal phase. Conversely, the activity represented in the late peak was responsible for the jaw opening movements from around the midline during the jaw opening phase.
were then statistically analyzed. With the exception of nose width, no statistically significant difference between the 3D image data and direct anthropometry was noted for all 15 measurements at 0-degree angulation. When the head was positioned at 15 degrees as anterior translation, the measurement point of mandibular angle was not detected in the 3D images. As for axial rotation at 10 degrees, the regions of ear and mandibular angle were also not determined. However, for each head position in the other angulation conditions, the same registrations in all facial anthropometric measurements were revealed. These results indicate that the measurement data acquired by non-contact 3D photogrammetry are sufficiently accurate and would not be significantly affected by changes of head position.
Original Article
Clinical Hint
Influence of head position on measurement of facial morphology by three-dimensional non-contact scanner
Application to orthodontic diagnosis of an upper-arch adjustable diagnostic articulator
Atsushi Shioyasono, Yasuo Oba, Kazuyuki Kaneko, Ryoko Uchida, Keiji Moriyama*
Kimiko Ogata, Yasuko Kageyama, Norimasa Okafuji, Saburo Kurihara*
Department of Orthodontics and Dentofacial Orthopedics, Institute of Health Biosciences, University of Tokushima Graduate School * Department of Maxillofacial Orthognathics, Tokyo Medical and Dental University Graduate School Orthod Waves-Jpn Ed 2007; 66(3): 134–142
Department of Orthodontics, School of Dentistry, Matsumoto Dental University * Institute for Oral Science, Matsumoto Dental University Orthod Waves-Jpn Ed 2007; 66(3): 143–148
Abstract: To examine the influence of head position on the accuracy of facial anthropometric measurements acquired by three-dimensional (3D) photogrammetry, we compared the measurement data obtained from a non-contact 3D image scanner (Danae 200) in various head positions versus direct anthropometry with calipers. The mannequin head postures that served to simulate the human position were calculated as axial rotation and anterior-posterior translation at four different angulations: 0, 5, 10, and 15 degrees. Sixteen standard facial measurements on the mannequin head were repeatedly obtained using the calipers and 3D photos, and these data
Abstract: It is difficult to apply non-adjustable articulators for the diagnosis of facial growth or orthognathic surgery. We report two examples using an upper-arch adjustable diagnostic articulator (Ortho Holder) developed in our university clinic. We placed a sliding plate between the upper arch of the articulator and upper cluster model. One block of the sliding plate with the upper model could be moved or held against the lower arch by unlocking or locking a screw on the sliding plate. The first example shows diagnostic demonstration of lower jaw growth against the upper jaw after calculation of distance of the differential growth by using A point superimposed profile-gram, and the second example shows model surgery plan with wax set-up model.
available at www.sciencedirect.com
journal homepage: www.elsevier.com/locate/odw
ODWJE Abstracts Volume 66 (2007): English abstracts of papers published in Japanese in the Orthodontic Waves – Japanese Edition, official Journal of the Japanese Orthodontic Society (ISSN 1349-0303)
Original Article
Case Report
Study on the distribution of cephalometric landmarks Research for datum lines make landmark area narrow down
A case of Pierre Robin sequence and its assessment of craniofacial development
Shinichi Hayakawa, Yuji Fuwa, Shigemi Goto
Toshiaki Usui, Setsuko Uematsu, Saburo Kurihara
Department of Orthodontics, School of Dentistry, AichiGakuin University Orthod Waves-Jpn Ed 2007; 66(1): 1–16
Department of Orthodontics, Matsumoto Dental Universityy Orthod Waves-Jpn Ed 2007; 66(1): 17–25
Abstract: There have been many studies of skeletal patterns and cranio-facial development by investigating cephalometric measurement values, but very few papers about coordinate data. This paper discusses an efficient method for plotting cephalometric landmarks on computer by investigating their distribution. To grasp the range of cephalometric landmarks, we investigated 50 cephalometric films of female skeletal III cases in IIIA stage. The following results and conclusions were obtained in this study. 1) It was difficult to narrow down the area for landmarks by using FH at S because of their wide distribution. 2) The area of landmarks was convergent or spread by leveling volume and superimposing on some cephalometric reference planes. N-Ba plane was the most efficient reference plane to narrow down the area for many landmarks. 3) The maxillary reference plane was the best to narrow down the area for landmarks related to denture pattern. 4) Combined use of reference planes using rejection ellipse was effective to narrow down the area for all landmarks. This appears very effective for plotting cephalometric landmarks and finding plotting errors. 1344-0241/$ – see front matter doi:10.1016/S1344-0241(07)00166-5
Abstract: This case report describes the non-surgical management of a patient with Pierre Robin sequence by accelerating mandibular growth and using a fixed edgewise appliance. The patient presented with class II malocclusion, deep bite, skeletal class II with retrognathia, and a high mandibular angle. The maximum occlusal force of this patient was higher than the average score of individuals belonging to the same age group. Intrusion of the upper incisors and flattening of the curve of Spee were planned for stimulating the growth of the mandible. Good facial balance was established as a result of significant growth of the mandible. There was progressive improvement in the facial appearance and a stable occlusion was also obtained. Clinical Hint Impacted lower first molar treated by means of orthodontic techniques with a pulley-type appliance for traction Nobuyuki Funabiki, Yukiko Naganawa*, Masahiro Kariya, Takashi Naganawa, Takamasa Kondo**, Shigemi Goto** Tsushima-City Ama-Tsushima Tanpopo Orthodontic Clinic * Nagoya-City Aichi Matsuba-kouen Orthodontic Clinic ** Department of Orthodontics, Aichi-Gakuin University School of Dentistry
158
orthodontic waves 66 (2007) 157–160
Orthod Waves-Jpn Ed 2007; 66(1): 26–32 Abstract: Two cases of an impacted lower first molar, which is very rare, are presented. Case 1: A boy aged 10 years 4 months, had scissors bite with the left side of the molar; 36 was impacted. Eruption of 37 preceded that of 36. Case 2: A boy aged 9 years 2 months, had cross bite with incisors; 46 was impacted and had a curved root. Just as in case 1, eruption of 47 preceded that of 46. These impacted teeth were treated by means of surgical and orthodontic techniques with a pulley-type appliance for traction. The teeth were successfully arranged into dentition with no relapse. Original Article Growth changes of the nasomaxillary complex in anterior crossbite cases after restoration of nasal respiratory function Makoto Kikuchi Kikuchi Orthodontic Office Orthod Waves-Jpn Ed 2007; 66(2): 63–71 Abstract: Moss’ Functional Matrix Theory states that nasal respiratory function is one of the factors influencing the growth of the nasomaxillary complex. It has also been suggested that there may be an association between an anterior crossbite with impaired nasal respiration and maxillary hypoplasia. This study included 53 patients with anterior crossbite due to maxillary hypoplasia suffering from impaired nasal respiration to observe their natural growth following referral to otolaryngologists for restoration of nasal respiration. Lateral cephalograms were taken to analyze changes in cephalometric measurements before and after improvement in nasal respiration and to compare with 21 normal nasal breathers. Patients with spontaneous correction of anterior crossbite showed increasing tendencies for ANS-PNS distance and convexity and labial tipping of the upper incisors. In patients without spontaneous correction of anterior crossbite, both ANS-PNS distance and convexity tended to increase but the anterior teeth were still in crossbite due to deep overbite. The maxilla remained hypoplastic with little increase in ANS-PNS distance or convexity in patients without improvement of nasal respiratory function. These results indicate a possibility of restoring nasal respiratory function and promoting the growth of the nasomaxillary complex through elimination of nasal respiratory disturbances. Original Article Prediction of lateral soft tissue profile following orthognathic surgery for mandibular prognathism Kohei Hida, Toshiko Sekiya, Hajime Tokiwa, Yoshiki Nakamura, Ayao Hirashita Department of Orthodontics, School of Dental Medicine, Tsurumi University Orthod Waves-Jpn Ed 2007; 66(2): 72–80
Abstract: The purpose of this study was to predict the posttreatment position of certain soft tissue points from the pretreatment conditions in surgical-orthodontic patients using a multiple linear regression analysis. A cephalometric analysis was made using pretreatment and posttreatment lateral cephalograms of 51 mandibular prognathic adult females treated with orthodontics combined with sagittal splitting ramus osteotomy. The following results were obtained: 1. Posterior displacement of the chin region and posteroinferior displacement of the upper and lower lips were observed after orthognathic surgery. 2. Accompanied with high multiple correction coefficients and multiple coefficients of determination, the functions obtained from multiple linear regression analysis enabled us horizontally and vertically to predict the posttreatment position of the soft tissue points. 3. It was shown that the horizontal and vertical positions of the upper incisors posttreatment can affect the profiles of the chin region and upper and lower lips. In conclusion, the soft tissue profile is very likely to be predicted from the pretreatment conditions using a multiple regression model. In addition, the present study suggests that positioning the upper incisors in the presurgical orthodontic treatment plays a key role in determining the posttreatment soft tissue profile. Original Article Three-dimensional diagnostic imaging of the alveolar bone using dento-maxillofacial cone-beam X-ray CT - Dimensional accuracy and reproducibility of images of the alveolar bone Yoko Kataoka, Haruhisa Nakano, Yukiko Matsuda*, Kazuyuki Araki*, Tomohiro Okano*, Koutaro Maki Department of Orthodontics, School of Dentistry, Showa University * Department of Dental Radiology, School of Dentistry, Showa University Orthod Waves-Jpn Ed 2007; 66(2): 81–91 Abstract: Orthodontic treatment plans should be established after assessing the three-dimensional morphology of the alveolar bone. Cone-beam X-ray CT (CBCT) in the dentomaxillofacial region has recently been developed and used for three-dimensional diagnostic imaging of the alveolar bone. In this study, the dimensional accuracy on MPR images, image indication conditions appropriate for the alveolar bone, and reproducibility of image of its cross-sectional area were evaluated so as to clarify the usefulness of CBCT. Materials were four dry human mandibular bones and four unilaterally excised human mandibular bones. Metal balls were applied to the buccal coronal area of each tooth and the alveolar bone, supposing the tooth axis, and CT was taken. From the measurements obtained, I) dimensional accuracy, II) establishment of window levels, and III) reproducibility of the cross sectional area were evaluated. As a result,
orthodontic waves 66 (2007) 157–160
I. measurements of the distance between markers showed no significant differences between actual measurements and CT measurements both in the dry and excised human mandibular bones (p < 0.05); II. the appropriate MPR image indication conditions for the alveolar bone were window width of 2,000 and window level of 500; III. MPR images almost appropriately reproduced the cross sectional area. Our results suggest that the dimensional accuracy of MPR images was good by CBCT, and thin bones such as the alveolar bone could be observed by setting appropriate image indication conditions. Original Article Three-dimensional analysis of smile movement using high speed cameras for the subjects with normal occlusions and jaw deformities Takako Ishikawa, Yoko Saito*, Shima Muraoka, Kitahara**, Hideki Ioi**, Akihiko Nakashima**
Toru
Division of Oral Health, Growth & Development, Graduate School of Dental Science, Kuyshu University * Department of Dental Anesthesia, Anesthesia and Critical Care Center, Kagoshima University Medical and Dental Hospital ** Division of Oral Health, Growth & Development, Faculty of Dental Science, Kuyshu University Orthod Waves-Jpn Ed 2007; 66(2): 92–105 Abstract: We investigated the influences of malocclusions and jaw deformities on the smile motion. The subjects consisted of a control group of 20 subjects with normal occlusions and 10 orthodontic patients with jaw deformities. Six measuring markers on the face (upper lip, lower lip, rightand-left angulus oris, right-and-left cheeks) and 3 reference markers on the upper face were placed on the skin. The motion of the measuring markers was detected automatically by the 3 high-speed cameras during smiling phase and analyzed 3 dimensionally by means of the 3-dimension operation analysis software. The head was not stabilized during the measurements and the motion of the head was canceled by the movement of triangle comprised of three reference markers. Measurements were conducted 3 times for each subject and regarded the mean values as the representative values. The results showed that the lower lips for the jaw deformity patients showed larger displacements to the downward and lateral directions compared with the control subjects even though these showed small displacements to the backward. The upper lip, angulus oris, and cheeks showed small displacements as a whole, especially to the upward and lateral directions. The recovery movements after smiling phase for the jaw deformity patients tended to delay compared with the control subjects. Thus, the features of lower face for the jaw deformity patients showed different movements compared with those of the control group. These results suggest that the morphological abnormity might prevent to express the natural smile.
159
Case Report Orthodontic treatment of an Angle Class III crowding case with TMD: Comparison of a jaw movement between pre-and posttreatment Yasuyo Sugawara, Shingo Kuroda, Teruko Takano-Yamamoto*, Takashi Yamashiro Department of Orthodontics and Dentofacial Orthopedics, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University * Division of Orthodontics and Dentofacial Orthopedics, Graduate School of Dentistry, Tohoku University Orthod Waves-Jpn Ed 2007; 66(2): 106–112 Abstract: The present report describes orthodontic treatment of a female patient with a moderate anterior crowding and anterior and posterior crossbites. She had history of closed lock in the temporomandibular joint (TMJ), which was released with stabilization sprint. Magnetic resonance imaging (MRI) of the right TMJ demonstrated anterior disk displacement with reduction. The crossbites and moderate crowding were eliminated by orthodontic treatment involving with lateral expansions of the upper and lower dental arches and subsequent non-extraction edgewise therapy. A 6-degreeof-freedom jaw movement recording system revealed that impaired jaw movement presumably caused by the crossbite and the crowding was almost corrected by the dental arch alignment. After a retention period of 33 months, the patient showed stable occlusion. Original Article Movements of mandibular condyle on working side and activities of masseter and lateral pterygoid muscles during masticatory-like jaw movements induced by electrical stimulation on the corticalmasticatory area in rabbits Takumi Morita, Takuya Fujiwara*, Takefumi Negoro*, Chikayuki Kurata**, Hisanobu Maruo**, Kenichi Kurita**, Shigemi Goto*, Katsunari Hiraba Department of Physiology, School of Dentistry, Aichi-Gakuin University * Department of Orthodontics, School of Dentistry, AichiGakuin University ** 1st department of Maxillofacial Surgery, School of Dentistry, Aichi-Gakuin University Orthod Waves-Jpn Ed 2007; 66(3): 123–133 Abstract: We studied the relationship between movements of the mandibular condyle and activities of the masseter and lateral pterygoid muscles during electrically induced fictive mastication. Since there is a delay from the generation of action potentials of muscles to the onset of actual tension, we analyzed the temporal relationship between the electromyogram (EMG) and the jaw movements while taking this delay quantitatively into consideration. The incisal point made grind-type movements on the frontal plane with large lateral movements extending into the contralateral side. During the grind-type incisal movements, the condyle on the working side showed characteristic
160
orthodontic waves 66 (2007) 157–160
movements of three phases on the sagittal plane: posterosuperior in closing phase, anteroinferior in occlusal phase and anterior in opening phase. The lateral pterygoid muscle on the working side showed a bimodal EMG activity coincident with the middle stage of the occlusal phase and the opening phase. Taking the delay from the generation of EMG to the onset of muscle tension into consideration, we consider that the activity represented in the early peak was responsible for the lateral jaw movements extending into the contralateral side during the end stage of the occlusal phase. Conversely, the activity represented in the late peak was responsible for the jaw opening movements from around the midline during the jaw opening phase.
were then statistically analyzed. With the exception of nose width, no statistically significant difference between the 3D image data and direct anthropometry was noted for all 15 measurements at 0-degree angulation. When the head was positioned at 15 degrees as anterior translation, the measurement point of mandibular angle was not detected in the 3D images. As for axial rotation at 10 degrees, the regions of ear and mandibular angle were also not determined. However, for each head position in the other angulation conditions, the same registrations in all facial anthropometric measurements were revealed. These results indicate that the measurement data acquired by non-contact 3D photogrammetry are sufficiently accurate and would not be significantly affected by changes of head position.
Original Article
Clinical Hint
Influence of head position on measurement of facial morphology by three-dimensional non-contact scanner
Application to orthodontic diagnosis of an upper-arch adjustable diagnostic articulator
Atsushi Shioyasono, Yasuo Oba, Kazuyuki Kaneko, Ryoko Uchida, Keiji Moriyama*
Kimiko Ogata, Yasuko Kageyama, Norimasa Okafuji, Saburo Kurihara*
Department of Orthodontics and Dentofacial Orthopedics, Institute of Health Biosciences, University of Tokushima Graduate School * Department of Maxillofacial Orthognathics, Tokyo Medical and Dental University Graduate School Orthod Waves-Jpn Ed 2007; 66(3): 134–142
Department of Orthodontics, School of Dentistry, Matsumoto Dental University * Institute for Oral Science, Matsumoto Dental University Orthod Waves-Jpn Ed 2007; 66(3): 143–148
Abstract: To examine the influence of head position on the accuracy of facial anthropometric measurements acquired by three-dimensional (3D) photogrammetry, we compared the measurement data obtained from a non-contact 3D image scanner (Danae 200) in various head positions versus direct anthropometry with calipers. The mannequin head postures that served to simulate the human position were calculated as axial rotation and anterior-posterior translation at four different angulations: 0, 5, 10, and 15 degrees. Sixteen standard facial measurements on the mannequin head were repeatedly obtained using the calipers and 3D photos, and these data
Abstract: It is difficult to apply non-adjustable articulators for the diagnosis of facial growth or orthognathic surgery. We report two examples using an upper-arch adjustable diagnostic articulator (Ortho Holder) developed in our university clinic. We placed a sliding plate between the upper arch of the articulator and upper cluster model. One block of the sliding plate with the upper model could be moved or held against the lower arch by unlocking or locking a screw on the sliding plate. The first example shows diagnostic demonstration of lower jaw growth against the upper jaw after calculation of distance of the differential growth by using A point superimposed profile-gram, and the second example shows model surgery plan with wax set-up model.