Impacted Canines-Ericson & Kurol Copia

European Journal of Orthodontics 10 (1988) 283-2951988 European Orthodontic Society Early treatment of palatally erupting maxillary canines by extraction of the primary canines Sune Ericson and Juri Kurol Jonkoping, Sweden The effect of extraction of the primary canine on palatally erupting ectopic maxillary canines was analysed. There were 46 consecutive ectopic canines, in 35 individuals, aged 10.013.0 years (mean age 11.4 years) at the time of discovery of the ectopic eruption. All cases showed no or minor space loss. After extraction of the primary canine, the children were investigated clinically and radiographed at 6-month intervals for up to 18 months. In 36 of the 46 canines (78%) the palatal eruption changed to normal; 23 already showed improved positions after 6 months and 13 after 12 months. No new cases normalized after 12 months. We suggest that extraction of the primary canine is the treatment of choice in young individuals to correct palatally ectopically erupting maxillary canines provided that normal space conditions are present and no incisor root resorptions are found. SUMMARY Introduction The maxillary permanent canine is second only to the third molar in frequency of impaction, with a prevalence of approximately 2 per cent of the population (Thilander and Jakobsson, 1968; Ericson and Kurol, 1986a). The canine is found palatal to the dental arch in about 85 percent of the cases and buccal only in about 15 percent (Hitchin, 1956; Rayne, 1969; Ericson and Kurol, 1987a). If orthodontic treatment is not started, there is always a risk of retention and also of resorption of the roots of the permanent incisors. Such resorptions have recently been reported to occur in 12 percent of cases of ectopic eruption of the maxillary canines in the age range 10-13 years (Ericson and Kurol, 1987a). Resorptions may be found as early as 10 years of age but occur most often in the age groups 11 to 12 years (Ericson and Kurol, 1987b). The most common treatment procedure in children and adolescents is surgical exposure followed by orthodontic appliance treatment, where, as a rule, the primary canines are left in place until the orthodontist has moved the impacted tooth to this region (Moyers, 1973; Clark, 1971; Bishara et al., 1976; Hunter, 1983a, b; Fleury et al., 1985). Other proposed strategies are 1. acceptance, i.e. no treatment, 2. extraction of the malerupting canine, and 3. surgical repositioning (Richardson and McKay, 1983). Several aetiological factors for ectopic canine eruption have been proposed, and include hereditary factors, lack of space, persistence of primary canines, a true ectopic path of eruption, reduced root length or aplasia of lateral incisors (Richardson and McKay,. .1982; Jacoby, 1983; Becker et al., 1984). Delayed exfoliation of the primary canine was believed by Lappin (1951) to be the principal aetiological factor and he presumed that it would be possible to prevent the condition from occurring in a great many cases, by extracting the primary canine. This was also suggested by Miller (1963) and Williams (1981). Berger, in 1943, stated that widening of the arch in the premolar region and early extraction of the primary canines were advisable as precautionary measures to prevent incisor root resorptions. A thorough search of the literature has shown that sporadic case reports where extraction of the primary canine has favourably influenced the future path of eruption have been presented over the last 50 years (Buchner, 1936; Kettle, 1957; Lind, 1977; Williams, 1981; Leivesley, 1984). In some of the presented case reports, Normal space conditions. 1979). Silling et al.284 SUNE ERICSON AND JURt KUROL however. On the other hand. 14 boys and 21 girls.. Normalization of the left canine 6 months after extraction of the primary canine (D). . intra-oral axial-vertex radiograph (B) and intra-oral periapical films (C) showing the left maxillary permanent canine in a true palatal ectopic path of eruption and the right canine with a lingual tendency. there is also a case report in which extraction of the primary canine did not affect the eruption of the permanent canine (Hotz. however. Other authors have made more or less casual remarks that extraction of the primary canine may offer a possibility of correcting impacted canines (Hotz. It was also considered of interest to determine when such a corrective effect of the extraction could be ascertained. Subjects and methods Forty-six consecutive ectopic palatally placed maxillary canines were studied. The purpose of this prospective study was to analyse the effect of extraction of the primary canine on palatally erupting maxillary canines in young individuals. only a slight displacement of the canine is present in the periapical intra-oral radiographs. At the start of treatment. were between 10 and 13 years Figure 1 Orthopantomogram (A). No systematic longitudinal study to evaluate the corrective effect of primary canine extraction on the palatally deflected path of eruption of maxillary canines has been carried out. the primary canines are present. Howard. The children. 1957). 1974. 1974). 1978. for example with the crown in a good position but with an increased mesial angulation (Kettle. 1986a. Fig. a) to the midline and distance (dl) to the occlusal line.9 Total Number of teeth 17 13 16 Percent 37 28 35 46 100 old at the time of the discovery of the ectopic position (Tablel) and were referred for treatment from the Public Dental Service after the introduction of a digital palpation screening method (Ericson and Kurd. OL. . 1). 1986b). Inability to locate the canine in the normal position by digital palpation prompted a supplementary radiographic examination of the canine.ECTOPIC MAXILLARY CANINES 285 Table 1 Distribution according to age at the time of extraction of the primary canine.d. The eruption angles and positions of the Sector Number 13 11 20 2 0 Sector Number di 8 18 17 (degrees) Mean s. of the permanent maxillary canine in the frontal plane (orthopantomogram) at the start of treatment. Range 22. where its position was carefully determined in three planes (Ericson and Kurol.0 11. 2-55 Figure 2 Mesial inclination (alpha. Age-group 10-10.i (mm) 14.S-2O.3 Figure 3 Distribution of the 46 maxillary canines according to the medial position of the canine crown in sectors 1-5 in the (A) frontal plane and (B) transverse plane (derived from orthopantomogram and axial-vertex views) at the start of treatment.9 12-12.9 11-11. 3).2 9. 2) and the medial crown position in sectors 1 -5 (Fig. permanent maxillary canines were determined as follows: —In the frontal view (orthopantomogram) (A) the angle of the canine (B) the distance of the cusp tip to the occlusal line (Fig.7 3. Results The main results are presented in' Table 2. lingual tendency and correctly positioned. 14 boys and 21 girls. Two of the resorptions were superficial and two were extensive and reached the pulp.286 SUNE ERICSON AND JURI KUROL Table 2 Effect of the extraction of the primary canine on the 46 maxillary canines with a palatally ectopic path of eruption in 35 individuals. the treatment planning for orthodontic treatment of their malocclusion included extraction of maxillary teeth and these two cases were therefore included in this study. another 13 teeth had normalized and another 14 canines had improved positions and showed clinically good positions at the 18-month control. if a clearly noticeable improvement of the position of the maxillary permanent canine was registered. one only slight improvement and two an impaired position with the crown moving more medially during the observation period. Thus. Medial position {sectors 1-5. Fig. Nine of these had already normalized at this time (for example. and 14 (64%) of these normalized (Table 3). 3) Of the 46 canines. The permanent canines were then followed clinically and radiographically at sixmonth intervals up to 18 months for the radiographic procedure. the primary canine was extracted. Table 2. 22 overlapped the adjacent lateral incisor (in the orthopantomogram) by more than half of the lateral root. Time factor Of the 36 cases with normalization and clinically correct position at the final control. if necessary. The maximum width of the dental follicle of the canine was measured on the intra-oral periapical radiographs. —In the sagittal plane (lateral head film). 2 Sector 3. the distances to the occlusal line. Fig. 1). All cases had good dental arches and no space deficiency was registered after measuring with sliding calipers. In four of the 46 cases (one boy and three girls). Of the 24 canines which overlapped the lateral incisor root by less . After 12 months. 23 canines (64%) already showed improved positions radiographically at the 6-month control. Canine position (orthopantomogram) Sector 1. the lateral incisors already showed root resorption on the palatal side at start. Immediately after diagnosis of the ectopic palatal path of eruption. The position of the canine crown relative to the dental arch was classified as completely lingual. No new cases of improvement occurred between the 12-month and 18-month observations. For ten teeth no improvement was registered: seven showed no change at all. In the latter two cases. There had been no early extraction of primary molars in the maxilla. Student's /-test was used for parametric variables and the chi-square test for non-parametric variables for the analysis of differences between the registrations (Nie et al. the radiographic follow-up was terminated at the 6 or 12-month control. and clinically to full eruption or to the end of necessary orthodontic appliance treatment. Conventional statistical methods were used for calculation of means and standard deviations. Altogether 36 (78%) of the 46 ectopic canines showed normalization of the path of eruption and later clinically correct position at the final control. aged 10-13 years.. 4 Total Total number of canines 24 22 46 Improved position after 6 months after 12 months 3 10 No change after 18 months 2 6 Worsening after 18 months 19 4 23 2 2 13 S —In the transverse plane (vertex projection) the position of the crown of the canine relative to the adjacent lateral incisor and dental arch was determined from the vertex projection and the conventional intra-oral projections. 1975). Number and percent. 4). At the start of treatment.4 n(%) 22(46) 9(20) Total number 46 46* 36*(78) 2(4) 8(17) 46* * 9 canines had normal positions at the 6-month radiographic control and another 13 at the 12-month control. Number and percent. after 12 and after 18 months. than half of the root at the start of treatment. The change in medial canine crown position in relation to time after extraction can be seen from Table 3. Fig. Table 4 The distribution of the canine crown position relative to the midline of the dental arch in the horizontal plane as shown in the axialvertex radiogram. where eight of the ten teeth with no final normalization belonged to sectors 3 and 4 and one to sector 2 at the start.ECTOPIC MAXILLARY CANINES Table 3 Distribution of the medial position of the maxillary permanet canine in sectors 1-4 in the vertical plane as shown in the orthopantomogram. At the start of treatment. Position relative to the dental arch Palatal tendency n(%) 19(41) 15(33) Central or buccal tendency n(%) Registration At start (n = 46) 12 months after extraction (n = 37) 18 months after extraction (n = 24) Palatal n(%) 27(59) 9(20) Total number 46 46* 22(48)* 8(17) 2(4) 36(78)* 46* * 9 canines had normal positions at the 6-month radiographic control and another 13 at the 12-month control. Medial maxillary canine crown position in sector Registration At start (n = 46) 12 months after extraction (n = 37) 18 months after extraction (n = 24) 287 1 n(%) 13(28) 28*(61) 2 n(%) 11(24) 9(20) 3. 12 months and 18 months after extraction of the primary canine. Of the 27 canines (59%) in a lingual position at the start of treatment (22 in . Position relative to the dental arch The distribution of the canine crown position relative to the midline of the dental arch is shown in Table 4. 22 (91%) normalized (Table 2. The positions of the canines in the vertex projection (Fig. No teeth were in sector 5. 3) showed concordant results and will not be reported in detail. The distance as measured on the lateral head film showed concordant results compared to Table 6. 10- O*-4* 5*-9* I 15'-19* 20T-24" 25'-29* 3O'-34* 35*-39# 40*"44* 45'-49' 5O'-S5" ll Mesial inclination to the midline (orthopantomogram) Figure 5 Distribution of the mesial inclination (degrees) of the 46 maxillary canines to the midline in the orthopantomogram at the start of treatment . The distance at the start of treatment ranged from 9. The dynamic change in position and the mean difference at the different registrations are presented. sectors 3 and 4. All the rest normalized except one. the canines were on average positioned about 15 mm from the occlusal line in the orthopantomogram and Table 6 shows the change during the observation period up to 12 months.5 to 20. The inclination is approximately normally distributed. 2) at the different registrations is shown in Table 6. Canine vertical distance to the occlusal plane I Figure 4 Schematic illustration of the normalization of the maxillary permanent canine at the control 18 months after extraction of the primary canines.288 SUNE ERICSON AND JURI KUROL could be seen for eight of the canines at the last control at 18 months. and 5 in sectors 1 and 2) only 9 (20%) remained in this position and no change The distance from the canine cusp to the occlusal plane (Fig. The change after extraction of the primary canines at the 6-month and 12-month controls is shown in Table 5. Mesial inclination The distribution of the mesial inclination of the maxillary canines at the start of treatment is shown in Figure 5. This means complete normalization in 78% of all cases. mesial and distal to the midline of the lateral incisor in the orthopantomogram. At that time. Note the large standard deviations (Table 5). The figures indicate the rate of success for the permanent canine positions at the start of treatment.3 mm. which remained in a slight lingual position (lingual tendency). 7 s. Mean value and standard deviation at the different registrations and mean difference and level of significance.3 3.7 11.7 p < 0. 2) Overlapping more than half of the lateral (sectors 3.d.d.d.1+8.2 5.0 5.2 4.001 Table 7 Treatment procedures for 10 out of the 46 ectopic maxillary canines where no improvement of position was registered 12 months after extraction of the primary canine. 4) Total impaired position Treatment surgical exposure Orthodontic fixed appliance treatment ' Extraction of lateral No change 6 8 2 2 8 9 8 8 2 2 .8 d±s.3 9. Mean value and standard deviation at the different registrations and mean difference and level of significance. 11.0 17.01 d±s.1 p < 0.5 4.0 13.001 Table 6 The distance (mm) from the canine cusp to the occlusal plane in the orthopantomogram.ECTOPIC MAXILLARY CANINES Table 5 Mesial inclination (degrees) of the canine to the midline in the orthopantomogram.d.01 9. Level of significance 289 14.1 12.5 ±2. 3.0 ±1.9 s.8 + 9. Change of eruption path Position in the orthopantomogram Overlapping less than half of the lateral (sectors 1.3 p < 0. Registration At start (n = 46) 6-month control (n = 46) 12-month control (n = 37) 22. Registration At start (n = 46) 6-month control (n = 46) 12-month control (n = 37) mean 14. Level of significance p < 0. 290 No normalisation Ten of the 46 canines showed no change or an impaired position. Dental follicle The maximal width of the dental follicle of the maxillary canine. exceeded 3 mm in 13 cases and varied between 1 and 5 mm for the 46 canines. 1981. diagnosed at the start of treatment. SUNE ERICSON AND JURI KUROL 1984). this is the first prospective longitudinal study where such an effect on palatally erupting maxillary canines has been shown. There was no association in those cases which did not improve related to the size of the follicle. Discussion The effect of extraction of the primary canine on the palatally deflected path of eruption of the maxillary canine. the positions were normal in two cases. Three canines were positioned in sector 3 and one in sector 2 in the orthopantomogram at the start of treatment. The radiographs show the improvement of position and inclination from the start of treatment (C) to 6 months after extraction of the primary canine (D. To our knowledge. but there are sparse case reports in the literature (Buchner. Leivesley. unchanged in one and one canine showed an impaired position. Spontaneous corrections may occur but from Figure 6 Ectopic palatal eruption of the right maxillary canine in a girl aged 12 years 9 months at the start of treatment. No new cases of resorption were registered during the observation period. E). 1936. Kettle. all canines were in clinically favourable positions. measured on the intra-oral periapical radiographs. Perhaps extraction of the primary canine has been considered an 'oddity' and the success limited to cases with only a minor deflection. Nine of these teeth had a true lingual position at the start of treatment (Table 4) and in eight cases the cusp was positioned more medially to the midline of the lateral incisor in the orthopantomogram. Two of the resorptions were severe and reached the pulp at the start of treatment. 1977. Williams. as shown by Kettle (1957). This study clearly shows that extraction of the primary canine has a favourable effect on palatally malerupting maxillary canines. Almost 80 per cent of the cases were corrected due to the early extraction of the primary canines. Surgical exposure and orthodontic fixed appliance treatment was carried out in eight cases (Table 7). is analysed in this report. . where the orthodontic treatment plan included extraction of lateral incisors as one possibility from the start. One remained unchanged and one deteriorated during the observation period and these two cases are the extraction cases. Resorptions In the four cases with resorptions on the root of the lateral incisor. Lind. After orthodontic treatment. 1957. The mesial inclination and palatal position where the canine crown almost reaches the central incisor can be seen in the orthopantomogram (A) and axial vertex projection (B). The clinical treatment is shown in Table 7. Orthodontic textbooks and papers on treatment of ectopic maxillary canines do not mention this treatment approach. Figs. clinical palpation and if necessary radiographic examination (Ericson and Kurol. . while in most other cases a further 6 months of observation may be allowed. The results will be discussed with this assumption and reservation. as shown in Figures 2 and 4. If no improvement is detectable at the 12-month control. If such a change in eruption is not detectable at that time. 1 and 6) and up to a mesial inclination of the canine of 55 degrees to the midline in the orthopantomogram (Table 6). For ethical reasons. A positive change in the path of eruption could be observed radiographically in 50 per cent of the cases.ECTOPIC MAXILLARY CANINES 291 or improved positions. At the 12-month control. a new decision must be made and some canines posing a risk of further root resorption of the incisors. at the 6-month registration after extraction of the primary canine (Figs. Note that canine teeth with similar positions clinical experience. a few of the canines in the youngest age groups with a moderate dislocation of the canine might have corrected spontaneously. and in some cases (20%) also clinically. However. untreated control group but it is hardly likely that 22 of 24 canines (92%) in sectors 1 and 2 and 14 of 22 (64%) in sectors 3 and 4 (in the orthopantomogram) would do so. especially not those with the crown in advanced medial positions.e. 1986a). The width of the dental follicle exceeded 3 mm fpr both canines. as shown by us earlier (Ericson and Kurol. 1 and 6). In the axial-vertex projection (B) the cusp tips are positioned approximately in the same position lingually to the lateral incisor root Twelve months after extraction of the maxillary primary canines the orthopantomogram ( Q and axial-vertex projection (D) show an improved position of the left canine and a slightly impaired position of the right maxillary canine. This study has clearly demonstrated the favourable effect on the maxillary canine even in very medial positions of the canine crown (Table 3. may have to be surgically exposed and treated with orthodontic appliances. If the diagnosis is made early according to denned criteria i. it is not likely that ectopically erupting canines will be spontaneously corrected to such an extent. ID the orthopantomogram (A) the mesial inclination to the midline is 31 degrees for the left canine and 27 degrees for the right canine. 1986a). Table 2. we have not been able to design a study with a traditional. all but nine had normal Figure 7 Palatal ectopic eruption of both maxillary canines in a boy aged 12 years 11 months at the start of treatment Mixed dentition period. we suggest alternative treatment. there should be enough time to carry out alternative surgical and/or orthodontic treatment. it is not established whether this is a consequence or the primary cause of the ectopic palatal eruption. D. axial-vertex radiographs and intra-oral radiographs show the development from the start (A. and angulations may react differently even in the same individual. In order to be successful with this procedure of extracting the primary canine. 1974. Note that one-third of the patients in this study were between 12 and 13-years-old at the time of referral. C. The right maxillary canine is erupting palatally and the orthopantomograms. In spite of a difference of only four degrees in mesial angulation and concordant medial and lingual positions. It has often been mentioned that a palatal path of eruption may be seen in cases where the primary canine is unresorbed (Dewel.e. However. Due to the difficulty in predicting a favourable change of the path of eruption in the individual case. 1949.292 SUNE ER1CS0N A N D JURI KUROL Figure 8 Girl aged 12 years 8 months at the start of treatment. With earlier diagnosis according to our earlier recommendations (Ericson and Kurol. it will be possible to record even slight or moderate ehanges. as shown in Figure 7. Maxillary canines with a moderate lingual path of eruption normalized more often (90%) than canines in true lingual positions (65%). it may be possible to achieve even better results as the canine is then higher up and probably has a less deflected path of eruption. Hotz. in individuals aged 10-13 years. during a normal eruption period. F). The degree of palatal position at the start of treatment relative to the dental arch has been shown to influence the result (Table 4). i. 21 (46%) of the 46 primary canines were unresorbed and 25 (54%) showed various degrees of resorption. we must follow the eruption process radiologically by means of correct and standardized radiographs. no reliable forecast of success or failure can be made in the individual case. Salzmann. the left maxillary canine normalized but not the right. 1974). E) to 12 months after extraction of the primary canine (B. 1986b). Again. In this study. although the prognosis for the treatment on the whole is very good. as studies of distortion in rotational panoramic radiography and cephalography have demonstrated great tolerance with respect to angular and vertical distortions . If this is done. we recommend radiological and/or clinical supervision at sixmonth intervals after extraction of the primary canine until the permanent canine erupts. axial-vertex projection and intra-oral radiograph. it can be claimed that the registrations in this study have been performed with moderate errors. (Tronje.. In fact. C. alternative modes of treatment should be considered. Surgical exposure with subsequent orthodontic appliance treatment will be the main choice in those cases. an impaired position of the left maxillary canine is evident in the orthopantomogram. Based on these reports. The characteristics of those cases with no change or an impaired position have to be further analysed. McDavid et al. 1984.. F). acceptable for practical clinical purposes in the everyday clinical situation. 1972. 1985. 1986b) and extraction is normally not indicated unless a very early somatic and dental development is found. Incisor devitalization and some loss of alveolar bone support may also occur (Proffit and Ackerman. E) and 12 months later (B. Ahlqvist et al. D. Before the age of 10. 1965) was high for all our measurements (Ericson and Kurol. Guilford's coefficient of reliability (Guilford. 1982. . spontaneous correction of potentially malplaced canines may occur (Ericson and Kurol. 1982. Used together. 4985). Kohavi et al. and applying a relative scale for the mesio-distal and buccolingual determinations. With late diagnosis or crowding and in cases of resorption or very horizontal paths of eruption. 1988). both economically and in terms of the discomfort that result from more traditional treatment approaches.. 1986). Hansson and Under-Aronson. Boyd. 1976 a. Oliver and Hardy. In view of the positive results of this study we suggest that primary canine extraction is the treatment of choice in the age-group 10-13 years when the permanent maxillary canine has a palatal ectopic path of eruption.. as our experience of the method in such cases is too small. periodontal damage to the ectopic canine after surgical exposure and orthodontic alignment has been reported compared to control canines (Wisth et al.ECTOPtC MAXILLARY CANINES 293 Figure 9 Girl aged 11 years at the start or treatment (A. Early extraction of the primary canine in order to correct the malerupting maxillary permanent canine has considerable advantages for the child.b. 1986). we consider the methods describe the displaced canine and the changes in position with sufficient accuracy in three dimensions and are suitable for this clinical purpose. American Journal of Orthodontics and Dentofacial Orthopedics 91: 483492 Ericson S. British Dental Journal 154: 294-296 Hunter S B 1983b Treatment of the unerupted maxillary canine. Kurol J 1987b Incisor resorption caused by maxillary cuspids. if this extraction treatment is performed in time. American Journal of Orthodontics and Oral Surgery 29: 548-549 Bishara S E. Bern 340-353 Howard R D 1978 Impacted tooth position: Unexpected improvements. Kommer D D. alternative modes of treatment should be considered. Oesterle L J. British Dental Journal 100: 1-14 Hotz R 1974 Orthodontics in daily practice. Kurol J 1986b Longitudinal study and analysis of clinical supervision of maxillary canine eruption. The Angle Orthodontist 54: 218-225 . Mise au point a propos de 212 observations. Community Dentistry and Oral Epidemiology 14: 172-176 Ericson S. and in cases of resorption of the incisor roots or a very horizontal path of eruption.294 Conclusions and recommendations SUNE ERICSON AND JURI KUROL Berger H 1943 Idiopathic root resorption. Early diagnosis of maleruption is important for success. The ectopic position and the path of eruption of the maxillary canine should preferably be identified before the age of 11. Address for correspondence: Dr Juri Kurol Department of Orthodontics The Institute for Postgraduate Dental Education Jarnvagsgatan 9 S-552 55 Jonkoping Sweden References Ahlqvist J. With later diagnosis or crowding. The Angle Orthodontist 57: 332-346 Ericson S. When a favourable effect of treatment occurs. it is not possible to predict success or failure in the individual case. Its development and impaction. Montagano L N. American Journal of Orthodontics 84: 125-132 It has been clearly shown that extraction of primary canines in the upper jaw has a favourable effect on palataUy erupting maxillary canines in most cases. International Journal of Orthodontia 22: 1236-7 Clark D 1971 The management of impacted canines: free physiologic eruption. A clinical and radiographic analysis of predisposing factors. Preliminary considerations and surgical methods. McGraw-Hill. normalization is not to be expected and alternative treatment should be considered. Orthodontic methods. American Journal of Orthodontics 82: 478-486 Buchner H J 1936 Root resorption caused by ectopic eruption of maxillary cuspid. British Dental Journal 154: 324-325 Jacoby H 1983 The etiology of maxillary canine impactions. Kurol J 1988 Resorption of maxillary lateral incisors due to ectopic eruption of the canines. Zilberman Y. A radiographic study. Assaad-Auclair C. British Journal of Orthodontics 5: 87-92 Hunter S B 1983a Treatment of the unerupted maxillary canine. American Journal of Orthodontics 69: 371-387 Boyd R L 1982 Clinical assessment of injuries in orthodontic movement of impacted teeth. In view of the positive results. Part 1. Sultan P 1985 La canine incluse. Clinical and/or radiological controls at six-month intervals are recommended. Journal of the American Dental Association 82: 836-840 Dewel B F 1949 The upper cuspid. European Journal of Orthodontics 8: 133-140 Ericson S. Part 2. American Journal of Orthodontics and Dentofacial Orthopedics (In press) Fleury J E. New York 268-303 Hansson C. Kurol J 1987a Radiographic examination of ectopically erupting maxillary canines. Tsur B 1984 Root length of lateral incisors adjacent to palatally-displaced maxillary cuspids. Kurol J 1986a Radiographic assessment of maxillary canine eruption in children with clinical signs of eruption disturbance. Due to the great individual variation in the position of the maxillary canines at the start of treatment and to some extent also in the response to treatment. Principes generaux de traitement. If no improvement can be found at that time. Hans Huber Publishers. Welander U 1986 The effect of projection errors on cepbalometric length measurements. the change in position and in the path of eruption will be observed at the latest 12 months after the extraction of the primary canine. In: Fundamental statistics in psychology and education. although the prognosis for the treatment on the whole is very good. Revue de Stomatologie et de Chirurgie Maxillo-Faciale 86: 122-31 Guilford J P 1965 Introduction to analysis of variance. Deboets D. Linder-Aronson S 1972 Gingival status after orthodontic treatment of impacted upper canines. we suggest that primary canine extraction is the treatment of choice in the age-group 10-13 years when the erupting permanent maxillary canine has a palatal ectopic path of eruption. The Angle Orthodontist 19: 79-90 Ericson S. Transactions of the European Orthodontic Society: 433-441 Hitchin A D 1956 The impacted maxillary canine. Maffre N. Eliasson S. McNeil M H. European Journal of Orthodontics 8: 141-148 Becker A. Youngquist H W 1976 Management of impacted canines. 4th edn. Proceedings of the British Paedodontic Society 12: 15-25 Richardson A.of maxillary cuspid impaction. Overkakshomtandens eruptionsproblem. Swain B F. Journal of Dentistry for Children 51: 367-370 Lind V 1977 Ortodontisk bettvard VII. Part 2—Treatment. Acta Odontologica Scandinavica 34: 53-57 Wisth P J. In: Orthodontics. British Journal of Orthodontics 13: 229-236 295 Proffit W R. The Angle Orthodontist 5t: 30-40 Wisth P J. Edited by Graber T M. Journal of Dentistry for Children 46: 296-299 Thilander B. The Angle Orthodontist 46: 69-76 . Dental Practitioner 19: 194-204 Richardson A. The C V Mosby Company. supplementum 8 Miller B H 1963 The influence of congenitally missing teeth on the eruption of the upper canine. Norderval K. orthodontic movement. Bent D H 1975 Statistical package for the social sciences. Ackerman J L 1985 Diagnosis and treatment planning. Welander U. Dentc-Maxillo-Facial Radiology. Part 1—Aetiology and diagnosis. Boe O E 1976b Periodontal status of orthodontically treated impacted maxillary canines. Proceedings of the British Paedodontic Society 13: 13-23 Salzmann J A 1974 Orthodontics in daily practice. Tronje G. Transactions of the British Society for the Study of Orthodontics 74-84 Kohavi D. American Journal of Orthodontics 85: 72-77 Lappin M M 19S1 Practical management of the impacted maxillary cuspid. Philadelphia p 339 Silling G. Becker A. J B Lippincott Company. Supplementum 3 Williams B H 1981 Diagnosis and prevention. Current principles and techniques. Acta Odontologica Scandinavica 26: 145-168 Tronje G 1982 Image distortion in rotational panoramic radiography. and final tooth position as factors in periodontal breakdown of treated palatally impacted canines. Boe O E 1976a Comparison of two surgical methods in combined si/rgical-orthodontic correction of impacted maxillary canines. McKay C 1983 Delayed eruption of maxillary canine teeth.ECTOPIC MAXILLARY CANINES Kettle M A 1937 Treatment of the unerupted maxillary canine. Norderval K. Dentc-Maxillo-Facial Radiology. Chicago 526-529 Nie N. 2nd edn McGraw-Hill Book Company. Feingold M 1979 Retained primary teeth: their effect on developing occlusions. Nummikoski P 1985 Imaging characteristics of seven panoramic x-ray units. Tandlakartidningen 69: 1066-1075 McDavid W D. Hardy P 1986 Practical and theoretical aspects of a method of orthodontic traction to unerupted teeth illustrated by three cases. Jakobsson S O 1968 Local factors in impaction of maxillary canines. Steinbrenner K. 3rd edn Year Book Medical Publishers Inc. Transactions of the British Society for the Study of Orthodontics 17-24 Movers R F 1973 Handbook of orthodontics. Philadelphia Oliver R G. McKay C 1982 Delayed eruption of maxillary canine teeth. American Journal of Orthodontics 37: 769-778 Leivesley W D 1984 Minimizing the problem of impacted and ectopic canines. Keller J G. St Louis p 95 Rayne J 1969 The unerupted maxillary canine. Hull C H. Morris C R. Jenkins J G. Zilbennan Y 1984 Surgical exposure. 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