Impact of Unilateral Alveolar Bone Grafting on Nasal Volume and Nasolabial Surface: A 3D Analysis.

OBJECTIVE: To determine possible effects of unilateral alveolar cleft closure on internal nasal volume and external nasolabial surface. DESIGN: Retrospective, single-arm, cohort study. SETTING: Institutional, tertiary care. PATIENTS: Patients with complete unilateral cleft lip, alveolus, and palate (CUCLAP), who underwent closure of the alveolar cleft with autologous bone graft (ABG) at the age of 9-11 years, with cone beam computed tomography (CBCT) and/or three-dimensional (3D) stereophotogrammetry images taken before and one year after the ABG procedure. INTERVENTIONS: ABG-pocedure in patients with CUCLAP. MAIN OUTCOME MEASURES: The influence of ABG on the internal and external nasal morphology. RESULTS: A total of 28 patients (21M/7F, 14R/14L) were divided into internal (CBCT) and external (3D-stereophotogrammetry) measurement subgroups. The external nasolabial surface showed a significant decrease of the angle alar curvature right-subnasale-alar curvature left (-1.99°; P = .02; 95% CI -2.61, -0.36) and an increase of the linear measurement between these points (+1.01 mm; P = .03; 95% CI: 0.11, 1.91). No significant differences were found when comparing the distance maps of the affected side with the non-affected side (P = .50, 95% CI: -0.20, 0.29). CONCLUSIONS: Closure of the alveolar cleft in CUCLAP patients with ABG did not affect the internal nasal volume, but significantly affected the external nasal surface. The procedure resulted in the nose becoming wider because both alar curvatures moved caudally and laterally relative to the subnasale.

Nasolabial shape and aesthetics in unilateral cleft lip and palate: an analysis of nasolabial shape using a mean 3D facial template.

The aim of this study was to determine the amount of deviation in nasolabial shape in patients with a cleft compared with an average non-cleft face, and to assess whether this difference is related to nasolabial aesthetics. Three-dimensional stereophotogrammetric images of 60 patients with a unilateral cleft were used. To quantify shape differences, four average non-cleft faces were constructed from stereophotogrammetric images of 141 girls and 60 boys. Three-dimensional shape differences were calculated between superimposed cleft faces and the average non-cleft face for the same sex and age group. Nasolabial aesthetics were rated with the modified Asher-McDade Aesthetic Index using a visual analogue scale (VAS). Mean VAS scores ranged from 51.44 to 60.21 for clefts, with lower aesthetic ratings associated with increasing cleft severity. Shape differences were found between cleft faces and the average non-cleft face. No relationship was found for the VAS, age, and sex, except that a lower VAS was related to a higher nose and lip distance between the superimposed cleft and average non-cleft faces for nasal profile (P= 0.02), but the explained variance was low (R2=0.066). In conclusion, except for nasal profile, nasolabial aesthetics were not influenced by the extent of shape differences from the average non-cleft face.

Disturbances of dental development distinguish patients with oligodontia-ectodermal dysplasia from isolated oligodontia.

OBJECTIVE: To investigate phenotypic differences in dental development between isolated oligodontia and oligodontia-ectodermal dysplasia (ED). SETTING AND SAMPLE POPULATION: A total of 129 patients diagnosed with isolated oligodontia and 22 patients with oligodontia as part of ED were eligible. METHODS: The phenotype of dental development was assessed for the frequency of missing a certain tooth, dental age, development of each tooth present, abnormal size and abnormal shape of teeth. The data were analysed building linear, ordinal and logistic regression models. RESULTS: Compared to patients with isolated oligodontia, patients with oligodontia-ED missed more frequently central incisors and second molars in both jaws, and lateral incisors in the mandible (P < .05). Oligodontia-ED was associated with delayed development of the permanent dentition (ß = -0.10; 95% CI: -0.17, -0.03). Specifically, the maxillary teeth: right central incisor, right lateral incisor, right second premolar and left second premolar were delayed approximately from 2 to 4 developmental stages. In addition, the left mandibular second premolar was 3 developmental stages delayed. Abnormal shape of teeth was 7 times more evident in patients with oligodontia-ED compared to patients with isolated oligodontia (OR = 6.54; 95% CI: 2.34, 18.28). The abnormal size of teeth was not a distinctive characteristic for oligodontia-ED. CONCLUSIONS: Oligodontia-ED distinguishes from isolated oligodontia by more disturbances in dental development. The abnormal shape of incisors and canines in a patient with oligodontia can raise suspicions for accompanying ectodermal abnormalities.

[Combined orthodontic and restorative treatment]. / De gecombineerde orthodontisch restauratieve behandeling.

In patients with agenesis or enamel anomalies in anterior teeth combined orthodontic and restorative treatment is often necessary to achieve an optimal aesthetic result. How both can best be achieved, but also how to maintain the result, requires communication between the dentist and the orthodontist. The orthodontic treatment plan needs to be established in cooperation with the dentist who will carry out the restorative treatment while the patient is at a young age. Since with these young patients, who are still growing craniofacially and whose teeth are still developing, possible future restorative and/or orthodontic treatment, as well as the means of orthodontic retention, need to be included in the treatment plan. In cleft palate patients, it is also important that methods of orthodontic retention of maxillary arch width are given timely attention in the restorative treatment plan because it is especially vulnerable to relapse.

Evaluation of the anterior mandibular donor site one year after secondary reconstruction of an alveolar cleft: 3-dimensional analysis using cone-beam computed tomography.

The aim of this study was to analyse changes in the volume of the chin after harvest of a bone graft for secondary reconstruction of an alveolar cleft. Cone-beam computed tomographic (CT) scans of 27 patients taken preoperatively, and immediately and one year postoperatively, were analysed, and 3-dimensional hard-tissue reconstructions made. The hard-tissue segmentation of the scan taken one year postoperatively was subtracted from the segmentation of the preoperative scan to calculate the alteration in the volume of bone at the donor site (chin). A centrally-orientated persistent concavity at the buccal side of the chin was found (mean (range) 160 (0-500) mm(3)). At the lingual side of the chin, a central concavity remained (mean (range) volume 20 (0-80) mm(3)). Remarkably, at the periphery of this concavity there was overgrowth of new bone (mean (range) volume 350 (0-1600) mm(3)). Re-attachment of the muscles of the tongue resulted in a significantly larger central lingual defect one year postoperatively (p=0.01). We also measured minor alterations in volume of the chin at one year. Whether these alterations influence facial appearance and long term bony quality is to be the subject of further research.

[Primary failure of eruption: diagnostics, treatment, casus and review of literature]. / Primair falen van eruptie: diagnostiek, behandeling, casuïstiek en literatuuroverzicht.

Primary failure of eruption is a rare eruption disorder of above all, the permanent second and sometimes the first molars. It is characterized by infra occlusion of the molars resulting in a severe lateral open bite. Primary failure of eruption is a disorders which affects all molars distal to the most mesial involved tooth. Diagnosis is possible both clinically and with radiographs. A panoramic radiograph combined with clinical findings of impaction or infra occlusion can confirm the suspicion of primary failure of eruption. Primary failure of eruption cannot be treated as other eruption disturbances are. The teeth do not respond to orthodontic force. Exposure of the molar and orthodontic traction of a molar affected by primary failure of eruption is discouraged. Observation and extraction, in case the primary failure of eruption poses a risk to the healthy dentition, are the only two treatment options for young patients. Additional treatment of this eruption disorder should be carried out at an adult age and consists of prosthetic closure of the open bite.

Reduced masticatory function is related to lower satellite cell numbers in masseter muscle.

The physiology of masseter muscles is known to change in response to functional demands, but the effect on the satellite cell (SC) population is not known. In this study, the hypothesis is tested that a decreased functional demand of the masseter muscle causes a reduction of SCs. To this end, twelve 5-week-old male Sprague-Dawley rats were put on a soft diet (SD, n = 6) or a hard diet (HD, n = 6) and sacrificed after 14 days. Paraffin sections of the superficial masseter and the m. digastricus (control muscle) were stained with haematoxylin and eosin for tissue survey and with anti-myosin heavy chain (MHC) for slow and fast fibres. Frozen sections of both muscles were double-stained for collagen type IV and Pax7. Slow MHC fibres were equally distributed in the m. digastricus but only localized in a small area of the m. masseter. No differences between HD or SD for the m. digastricus were found. The m. masseter had more SCs per fibre in HD than in SD (0.093 ± 0.007 and 0.081 ± 0.008, respectively; P = 0.027). The m. masseter had more fibres per surface area than the m. digastricus in rats with an SD group (758.1 ± 101.6 and 568.4 ± 85.6, P = 0.047) and a HD group (737.7 ± 32.6 and 592.2 ± 82.2; P = 0.007). The m. digastricus had more SCs per fibre than the m. masseter in the SD group (0.094 ± 0.01 and 0.081 ± 0.008; P = 0.039). These results suggest that reduced masseter muscle function is related to a lower number of SCs. Reduced muscle function might decrease microdamage and hence the requirement of SCs in the muscle fibres.

Maxillary arch width in unoperated adult bilateral cleft lip and alveolus and complete bilateral cleft lip and palate.

OBJECTIVES: To study maxillary arch width in adult patients with bilateral cleft lip and alveolus (BCLA) or with complete bilateral cleft lip and palate (BCLP), who have not had any surgery. SETTING AND SAMPLING POPULATION: Eighteen patients with BCLA, 13 patients with BCLP, and 24 controls from remote areas of Indonesia collected over 10 years. MATERIALS AND METHODS: Dental casts were digitized three-dimensionally using an industrial coordinate measuring machine (CCM) (Zeiss Numerex; Carl Zeiss, Stuttgart, Germany). Transversal distance between molars was measured on the tip of the distobuccal cusp and the tip of the mesiobuccal cusp, and for premolars and canines, the tip of the buccal cusps was recorded. Means and standard deviations were calculated for all variables. t-Test was used to determine whether the mean values of the cleft groups showed significant differences from each other and from the controls. Level of significance was set at p < 0.05. RESULTS: Transversal arch dimensions in the BCLA group were comparable to the controls except at the canine level. Intercanine distance, which is close to the alveolar cleft, was 4.3 mm (SE 1.4) smaller in the BCLA group (p = 0.002). In the BCLP group, a comparable pattern was found. At the canine level, mean transversal width was 7.2 mm (SE 1.9) smaller compared to the control group, but no significant differences were found in the other transversal dimensions. CONCLUSIONS: Small differences are found in transversal dimensions in patients with BCLA and BCLP compared to a control group. Differences are most outspoken in the area near the cleft.

[Orthodontics in general practice 3. Angle Class II/1 malocclusion: one-phase treatment treatment preferred to two-phase treatment]. / Orthodontie in de algemene tandartspraktijk 3. Angle Klasse II/1-malocclusie: beter een latere éénfase- dan een vroege tweefasenbehandeling.

With regard to the optimal treatment timing for children with an Angle Class II division 1 malocclusion, there is an ongoing controversy on the effectiveness of a two-phase or a one-phase therapy. Two-phase treatment involves a first phase to correct the jaw relationship starting at the age of 7 to 9 years, and, when all permanent teeth are present, a second phase of treatment by fixed appliances. A one-phase treatment involves treatment of the jaw relationship and the dental malocclusion simultaneously or consecutively, starting during the early adolescence period. In recent years, several randomized controlled clinical trials have been performed on this topic. More recently, a Cochrane meta-analysis of these trials has been published. The results show that early treatment of an Angle Class II division 1 malocclusion followed by a second phase of treatment does not have any advantages over treatment that is started later and finished in one phase. One-phase treatment is as effective as two-phase treatment, while the time needed for treatment is shorter and, as a consequence, total costs are lower. Dentists should take into account this information, when treating children with an Angle Class II division 1 malocclusion or referring them to an orthodontist.

Steiner cephalometric analysis: predicted and actual treatment outcome compared.

OBJECTIVE: To examine the accuracy and precision of the Steiner prediction cephalometric analysis. SETTING AND SUBJECTS: The sample consisted of 275 randomly selected patients, treated between 1970 and 1995 at a university department. METHODS: Lateral cephalograms before (T1) and after orthodontic treatment (T2) were analyzed using the Steiner analysis. A prediction of the final outcome at T2 for the variables ANB degrees, U1 to NA mm, L1 to NB mm, and Pg to NB mm was performed at T1. The difference between the actual outcome at T2 and the Steiner predicted value (SPV), which was done at T1, was calculated. Accuracy (mean difference between T2 and SPV) and precision (standard deviation of the mean prediction discrepancies) of the prediction were studied. Paired t-test was used to detect under- or overestimation of the predicted values. RESULTS: The mean decrease in angle ANB was 1.4 +/- 2.7 degrees and for U1 to NA 2.0 +/- 2.6 mm, while L1 to NB increased 0.8 +/- 2.0 mm and Pg to NB 0.7 +/- 1.1 mm. The predicted values for the changes in ANB angle, the distance of upper incisor U1 to NA as well as the distance Pg to NB were significantly overestimated when compared with the actual outcome, while the change in the distance of lower incisor L1 to NB was underestimated. CONCLUSION: The prediction of cephalometric treatment outcome as used in the Steiner analysis is not accurate enough to base orthodontic treatment decisions upon.

[Maxillofacial growth and dental implants in the maxillary anterior region]. / Gelaatsgroei en implantaten in het bovenfront.

Single tooth replacement with a dental implant is an increasingly popular solution in patients with loss of an upper anterior tooth. There is a risk, however, of placing the implant prematurely in youths. In a case series the effects of residual maxillary growth on the results of implant treatment in the anterior maxillary region were measured. The results confirm findings from other studies on this subject and indicate that cessation and degree of vertical growth are unpredictable. This may result in infraposition of the implant and lead to periodontal bone loss around the implant region and its neighbouring teeth. Clinicians should be aware of this and inform their patients that these changes may eventually compromise the aesthetic result of the treatment.

[Research methods in dentistry 10. Assessment of orthodontic treatment need]. / Onderzoeksmethoden in de tandheelkunde 10. Het bepalen van de orthodontische behandelingsbehoefte.

Approximately one third of the Dutch population has an objective need for orthodontic treatment. Yet, patients mostly seek treatment because of aesthetic reasons. Recent social developments and the increased attention for aesthetics ask for ways to objectively measure treatment need. This is not only important because of the risks of orthodontic treatment, but also because of financial reasons. In this article indices to verify treatment need, i.e. the Index for Orthodontic Treatment Need (IOTN), de Dental Aesthetic Index (DAI) en de Index of Complexity, Outcome and Need (ICON), are discussed. All three indices seem to lead to a reduction of treatment need, especially in borderline cases. They can serve as 'neutral' instruments to discuss treatment need with patients and as instruments to allocate financial resources for orthodontic care.