Enamel Renal Gingival Syndrome in an Adolescent.

Enamel renal gingival syndrome is a rare clinical condition characterized by the presence of amelogenesis imperfecta hypoplastic type, gingival fibromatosis and delayed tooth eruption, in addition to nephrocalcinosis with normal blood calcium levels. It is inherited as an autosomal recessive trait caused by mutations in the FAM20A gene located on chromosome 17q24.2. The purpose of this report is to describe a case of enamel renal gingival syndrome and discuss its distinct features and management.

Orofacial Anomalies in Kindler Epidermolysis Bullosa.

Importance: Kindler epidermolysis bullosa is a genetic skin-blistering disease associated with recessive inherited pathogenic variants in FERMT1, which encodes kindlin-1. Severe orofacial manifestations of Kindler epidermolysis bullosa, including early oral squamous cell carcinoma, have been reported. Objective: To determine whether hypoplastic pitted amelogenesis imperfecta is a feature of Kindler epidermolysis bullosa. Design, Settings, and Participants: This longitudinal, 2-center cohort study was performed from 2003 to 2023 at the Epidermolysis Bullosa Centre, University of Freiburg, Germany, and the Special Care Dentistry Clinic, University of Chile in association with DEBRA Chile. Participants included a convenience sampling of all patients with a diagnosis of Kindler epidermolysis bullosa. Main Outcomes and Measures: The primary outcomes were the presence of hypoplastic pitted amelogenesis imperfecta, intraoral wounds, gingivitis and periodontal disease, gingival hyperplasia, vestibular obliteration, cheilitis, angular cheilitis, chronic lip wounds, microstomia, and oral squamous cell carcinoma. Results: The cohort consisted of 36 patients (15 female [42%] and 21 male [58%]; mean age at first examination, 23 years [range, 2 weeks to 70 years]) with Kindler epidermolysis bullosa. The follow-up ranged from 1 to 24 years. The enamel structure was assessed in 11 patients, all of whom presented with enamel structure abnormalities. The severity of hypoplastic pitted amelogenesis imperfecta varied from generalized to localized pitting. Additional orofacial features observed include gingivitis and periodontal disease, which was present in 90% (27 of 30 patients) of those assessed, followed by intraoral lesions (16 of 22 patients [73%]), angular cheilitis (24 of 33 patients [73%]), cheilitis (22 of 34 patients [65%]), gingival overgrowth (17 of 26 patients [65%]), microstomia (14 of 25 patients [56%]), and vestibular obliteration (8 of 16 patients [50%]). Other features included chronic lip ulcers (2 patients) and oral squamous cell carcinoma with lethal outcome (2 patients). Conclusions and Relevance: These findings suggest that hypoplastic pitted amelogenesis imperfecta is a feature of Kindler epidermolysis bullosa and underscore the extent and severity of oral manifestations in Kindler epidermolysis bullosa and the need for early and sustained dental care.

Ophthalmic Manifestations of Heimler Syndrome in Two Siblings With PEX1 Variants.

PURPOSE: To report two new cases with confirmed diagnosis of Heimler syndrome and describe their systemic and ophthalmic phenotype and visual rehabilitation. METHODS: Retrospective review of medical records. RESULTS: Both siblings were diagnosed as having sensori-neural hearing loss and retinal dystrophy with exuberant intraretinal cystoid spaces and cone-rod dysfunction. The older sibling also had amelogenesis imperfecta and neither had nail abnormalities. Genetic analysis identified homozygosity for the pathogenic variant c.2528G>A p.(Gly843Asp) in the PEX1 gene in both siblings. The parents were heterozygous carriers of the variant. CONCLUSIONS: The authors report a familial case of Heimler syndrome due to biallelic PEX1 pathogenic variants that manifested as macular dystrophy characterized by cone-rod dysfunction and complicated by intraretinal cystoid spaces. Review of the literature shows that ocular phenotype is variable in patients with Heimler syndrome. [J Pediatr Ophthalmol Strabismus. 2024;61(1):59-66.].

Epileptic encephalopathy and amelogenesis imperfecta: What about KohlschüttereTönz syndrome? Case report and literature review.

BACKGROUND: KohlschüttereTönz syndrome (KTS), also called amelo-cerebro-hypohidrotic syndrome, is a very rare genetic condition, described for the first time by Kohlschutter, which typically manifests as a triad of symptoms:  amelogenesis imperfecta, infantile onset epilepsy, and intellectual disability. 47 cases were reported in English language literature since 1974-2021. CASE REPORT: A 7-year-old girl was referred for dental evaluation. Oral examination revealed yellowish color of all the teeth due to enamel hypoplasia. The radiographic exam revealed a thin layer of enamel with decreased radiopacity of the enamel compared to that of dentin. The diagnosis of amelogenesis Imperfecta was established. In addition to that, the child's parents reported that she had spasticity, epileptic seizures and psychomotor developmental delay. The association of all these features leads us to conclude to KTS. CONCLUSION: It seems that numerous cases of KTS are still undiagnosed in the world, so this paper highlights the common clinical features of Kohlschütter-Tönz Syndrome helping to an early diagnosis and more research about this condition.

Autoimmune amelogenesis imperfecta in patients with APS-1 and coeliac disease.

Ameloblasts are specialized epithelial cells in the jaw that have an indispensable role in tooth enamel formation-amelogenesis1. Amelogenesis depends on multiple ameloblast-derived proteins that function as a scaffold for hydroxyapatite crystals. The loss of function of ameloblast-derived proteins results in a group of rare congenital disorders called amelogenesis imperfecta2. Defects in enamel formation are also found in patients with autoimmune polyglandular syndrome type-1 (APS-1), caused by AIRE deficiency3,4, and in patients diagnosed with coeliac disease5-7. However, the underlying mechanisms remain unclear. Here we show that the vast majority of patients with APS-1 and coeliac disease develop autoantibodies (mostly of the IgA isotype) against ameloblast-specific proteins, the expression of which is induced by AIRE in the thymus. This in turn results in a breakdown of central tolerance, and subsequent generation of corresponding autoantibodies that interfere with enamel formation. However, in coeliac disease, the generation of such autoantibodies seems to be driven by a breakdown of peripheral tolerance to intestinal antigens that are also expressed in enamel tissue. Both conditions are examples of a previously unidentified type of IgA-dependent autoimmune disorder that we collectively name autoimmune amelogenesis imperfecta.

Association between malocclusions and amelogenesis imperfecta genotype and phenotype: A systematic review.

INTRODUCTION: The aim of this systematic review (Prospero CRD42022323188) is to investigate whether an association exists in patients with amelogenesis imperfecta (AI) between occlusal characteristics and genotype on the one hand and enamel structural phenotype on the other. MATERIAL AND METHODS: Reports up to May 2023 assessing occlusion of individuals with AI were browsed in a systematic search using Medline, Embase, ISI Web of Science, and the grey literature. Randomised control trials, case control studies, and case series specifying both occlusion, assessed by cephalometric or clinical analysis, and genotype or dental phenotype in patients with AI were included without any age limitation. Two authors independently selected the publications and extracted the data in accordance with the PRISMA statement. The risk of bias was assessed with the Critical Appraisal Checklists from the Johanna Briggs Institute. RESULTS: Twenty-five articles were chosen from the 261 results. Most of the included publications were case series (n=22) and case control studies (n=3). Thirteen studies reported both a genotype (ENAM, FAM83H, FAM20A, DLX3, CNMM4, WDR72) and occlusal diagnostic. The methodological quality of the studies was moderate. All AI phenotypes showed an open bite (OB) rate around 35%, except mixed form. The other malocclusions were not often mentioned. No correlation between occlusal phenotype and genotype or AI phenotype could be identified in patients with AI, as most studies had short occlusal descriptions and small sample sizes. CONCLUSION: OB malocclusions were more frequently reported in AI. This review highlighted the need for a more accurate description of orofacial features associated with AI, to better clarify the role of amelogenesis genes in the regulation of craniofacial morphogenesis and identify patients requiring orthognathic surgery at an early stage.

Chapter 4: Development Defects of Enamel and Dentine and Coronal Caries.

The development of the human dentition is prone to disruption due to its delicate and complex nature - including variations in tooth number and anatomical form and in the characteristics of enamel, dentine, and cementum. This chapter will focus on developmental defects of dental enamel (DDE) and dentine (DDD), which can be associated with considerable treatment burden on an individual, often related to the change in dental hard tissue characteristics in those at increased caries risk. DDE are prevalent and can be related to genetic conditions such as amelogenesis imperfecta and environmental challenges such as direct physical trauma to the developing tooth or systemic insults during the different phases of amelogenesis. Phenotypical variability can be great, making diagnosis difficult in many cases. There are two major enamel defects - the quantitative defect of hypoplasia and the qualitative defect of hypomineralization. DDDs are less prevalent than DDEs, with two major DDD types: dentinogenesis imperfecta and dentine dysplasia. The main features of the DDDs are enamel fracture exposing the dentine and subsequent wear, with enlarged pulp spaces in some variants. The appearance may be affected, with bulbous teeth and grey-blue to brown opalescent colouring. With respect to dental caries, developmental defects of the teeth, in themselves, do not cause caries risk; however, they can change the manifestation of the disease due to creating niches for biofilm accumulation and thereby increasing cleaning difficulty and changing the physical and chemical characteristics of dental hard tissues and how they react to cariogenic challenges.

Distal renal tubular acidosis, autoimmune thyroiditis, enamel hypomaturation, and tooth agenesis caused by homozygosity of a novel double-nucleotide substitution in SLC4A4.

BACKGROUND: Mutations in SLC4A4 have been reported to be associated with proximal renal tubular acidosis (RTA), short stature, band keratopathy, cataract, glaucoma, and hypoplastic-type amelogenesis imperfecta. In this study, the authors describe the clinical manifestations, and investigate the molecular etiology, in a patient with RTA. CASE DESCRIPTION: The authors report on a girl with distal RTA who carried a novel homozygous base substitution of 2 consecutive base pair variants (NM_001098484.3:c.808-2A>C and NM_001098484.3:c.808-1G>C) in the SLC4A4 gene. The patient had clinical manifestations of autoimmune thyroiditis and distal RTA, including hypercalciuria, nephrocalcinosis, and nephrolithiasis. In addition to the presence of hypoplastic-type amelogenesis imperfecta, generalized enamel hypomaturation, a feature seen in mice lacking Slc4a4, was also observed in the patient. The basic defect in this patient appeared to be impaired hydrogen ion secretion, leading to an inability to acidify the urine, resulting in alkaline urine (despite a normal serum anion gap), hypokalemic, and hyperchloremic metabolic acidosis. The pulp stones found in the patient may likely be the consequences of a disrupted acid-base homeostatic environment that precipitated mineral deposits. Even with proper treatments for distal RTA, the patient has had frequent recurrences of band keratopathy, pupillary membrane, and cataract. PRACTICAL IMPLICATIONS: This is the first report of distal RTA, autoimmune thyroiditis, tooth agenesis, enamel hypomaturation, and pulp stones associated with an SLC4A4 mutation. It is important for dentists to be aware that amelogenesis imperfecta in patients may be a sign of systemic diseases including RTA, nephrocalcinosis, or nephrolithiasis.

Pathogenesis of Enamel-Renal Syndrome Associated Gingival Fibromatosis: A Proteomic Approach.

The enamel renal syndrome (ERS) is a rare disorder featured by amelogenesis imperfecta, gingival fibromatosis and nephrocalcinosis. ERS is caused by bi-allelic mutations in the secretory pathway pseudokinase FAM20A. How mutations in FAM20A may modify the gingival connective tissue homeostasis and cause fibromatosis is currently unknown. We here analyzed conditioned media of gingival fibroblasts (GFs) obtained from four unrelated ERS patients carrying distinct mutations and control subjects. Secretomic analysis identified 109 dysregulated proteins whose abundance had increased (69 proteins) or decreased (40 proteins) at least 1.5-fold compared to control GFs. Proteins over-represented were mainly involved in extracellular matrix organization, collagen fibril assembly, and biomineralization whereas those under-represented were extracellular matrix-associated proteins. More specifically, transforming growth factor-beta 2, a member of the TGFß family involved in both mineralization and fibrosis was strongly increased in samples from GFs of ERS patients and so were various known targets of the TGFß signaling pathway including Collagens, Matrix metallopeptidase 2 and Fibronectin. For the over-expressed proteins quantitative RT-PCR analysis showed increased transcript levels, suggesting increased synthesis and this was further confirmed at the tissue level. Additional immunohistochemical and western blot analyses showed activation and nuclear localization of the classical TGFß effector phospho-Smad3 in both ERS gingival tissue and ERS GFs. Exposure of the mutant cells to TGFB1 further upregulated the expression of TGFß targets suggesting that this pathway could be a central player in the pathogenesis of the ERS gingival fibromatosis. In conclusion our data strongly suggest that TGFß -induced modifications of the extracellular matrix contribute to the pathogenesis of ERS. To our knowledge this is the first proteomic-based analysis of FAM20A-associated modifications.

Cost analysis of prosthetic rehabilitation in young patients with Amelogenesis imperfecta.

OBJECTIVES: Children and adolescents with amelogenesis imperfecta (AI) have extensive treatment needs, but costs have not been explored previously. We calculated the costs of prosthetic rehabilitation and analyzed whether costs of treatment begun in early adolescence are lower compared with in early adulthood. METHODS: Data from the dental records of 25 patients with AI and 25 age- and sex-matched controls were analyzed. Patients were followed for a mean period of 12.3 ± 1.5 years. Number of dental visits, dental treatment costs, and indirect costs were calculated during three time periods, before, during and after prosthetic therapy. Swedish national reference prices for general and specialist dental care were used. RESULTS: The mean number of visits was significantly higher in the AI group: 43.3 ± 19.7 (controls: 17.5 ± 19.8; p < .001). Mean total costs were 8.5 times higher for patients with AI: €16,257 ± 5,595 (controls: €1,904 ± 993). Mean number of crowns made in patients with AI was 12 ± 7 (range 1 - 31). Indirect costs were significantly higher in the AI group and constituted 22% of the total costs. After crown therapy, costs between groups ceased to differ significantly. Calculations of total costs in the hypothetical scenario (discount rate at 3% annually) were €18,475 for prosthetic rehabilitation began at age 12 years compared with €20,227 if treatment began at 20 years of age. CONCLUSIONS: Prosthetic rehabilitation costs for children and adolescents with AI can be high. Early crown therapy is associated with lower costs and a lower number of dental visits. CLINICAL IMPLICATIONS: Early crown therapy in children and adolescents with severe AI is a cost-reducing treatment associated with few complications and reduced need of dental care during adolescence compared with treatment begun at age 20.

A Rare Case of Brachyolmia with Amelogenesis Imperfecta Caused by a New Pathogenic Splicing Variant in LTBP3.

In recent years, a rare form of autosomal recessive brachyolmia associated with amelogenesis imperfecta (AI) has been described as a novel nosologic entity. This disorder is characterized by skeletal dysplasia (e.g., platyspondyly, short trunk, scoliosis, broad ilia, elongated femoral necks with coxa valga) and severe enamel and dental anomalies. Pathogenic variants in the latent transforming growth factor-ß binding protein 3 (LTBP3) gene have been found implicated in the pathogenesis of this disorder. So far, biallelic pathogenic LTBP3 variants have been identified in less than 10 families. We here report a young boy born from consanguineous parents with a complex phenotype including skeletal dysplasia associated with aortic stenosis, hypertrophic cardiomyopathy, hypodontia and amelogenesis imperfecta caused by a previously unreported homozygous LTBP3 splice site variant. We also compare the genotypes and phenotypes of patients reported to date. This work provides further evidence that brachyolmia with amelogenesis imperfecta is a distinct nosologic entity and that variations in LTBP3 are involved in its pathogenesis.

The peroxisomal disorder spectrum and Heimler syndrome: Deep phenotyping and review of the literature.

The spectrum of peroxisomal disorders is wide and comprises individuals that die in the first year of life, as well as people with sensorineural hearing loss, retinal dystrophy and amelogenesis imperfecta. In this article, we describe three patients; two diagnosed with Heimler syndrome and a third one with a mild-intermediate phenotype. We arrived at these diagnoses by conducting complete ophthalmic (National Eye Institute), auditory (National Institute of Deafness and Other Communication Disorders), and dental (National Institute of Dental and Craniofacial Research) evaluations, as well as laboratory and genetic testing. Retinal degeneration with macular cystic changes, amelogenesis imperfecta, and sensorineural hearing loss were features shared by the three patients. Patients A and C had pathogenic variants in PEX1 and Patient B, in PEX6. Besides analyzing these cases, we review the literature regarding mild peroxisomal disorders, their pathophysiology, genetics, differential diagnosis, diagnostic methods, and management. We suggest that peroxisomal disorders are considered in every child with sensorineural hearing loss and retinal degeneration. These patients should have a dental evaluation to rule out amelogenesis imperfecta as well as audiologic examination and laboratory testing including peroxisomal biomarkers and genetic testing. Appropriate diagnosis can lead to better genetic counseling and management of the associated comorbidities.

Orthognathic surgery with two-segment le fort i and sagittal split ramus osteotomies of open bite deformity in an amelogenesis imperfecta patient via virtual planning: A case report.

Amelogenesis imperfecta (AI) is an enamel defect and is often associated with the anterior open bite (AOB) and transverse maxillary deficiency. It is known that in such cases when AI and AOB appeared together, posterior maxillary impaction with or without bilateral mandibular ramus osteotomies is a frequently preferred treatment option. Virtual planning is more reliable rather than the conventional model surgery planning, especially for complicated cases. Usage area of virtual 3D anatomical models reconstructed from Cone Beam Computed Tomography (CBCT) data is expanding day by day for both diagnosis and surgical planning. The aim of this study is to present a patient with AI and AOB and transverse maxillary deficiency and management of this case with virtually planned two-segment Le fort I and sagittal split ramus osteotomies followed by prosthetic rehabilitation.

Non-syndromic occurrence of true generalized microdontia with hypodontia: A case report.

RATIONAL: Dental abnormalities can occur at any stage of tooth development. Of these abnormalities, true generalized microdontia is a rare condition in which all teeth are smaller than normal, while hypodontia is defined as the absence of 1 to 5 teeth. As far as we are aware, no article has reported a case of the non-syndromic occurrence of true generalized microdontia with hypodontia. PATIENT CONCERNS: A 9-year-old girl who had no systemic diseases presented with congenital absence of maxillary lateral incisors bilaterally and small teeth involving the whole dentition. DIAGNOSES: Based on intraoral examinations and panoramic radiograph, the patient was diagnosed with the simultaneous occurrence of true generalized microdontia, hypodontia, and a variation of maxillary 1st molar with a single root and single canal. Also, the patient had premature loss of mandibular molars and canines, periapical periodontitis in the mandible left 1st primary molar and deep caries in mandible left secondary primary molar. INTERVENTIONS: A removable appliance to hold space for early loss of mandibular molars and canines was made at the present stage. The mandible left 1st primary molar had periapical periodontitis and the affected tooth was extracted. Furthermore, the distal surface of the mandible left 2nd primary molar was filled with complex resin materials. A multi-disciplinary therapy plan was carefully designed including orthodontics, dental implants and esthetic restoration in the future. OUTCOMES: The patient complied well with instructions for wearing the removable space maintainer, which helps prevent mesial migration of the permanent 1st molars, at the current stage. The therapeutic efficiency on periapical periodontitis and caries lesions was also good. LESSONS: The non-syndromic presence of true generalized microdontia is extremely rare. A personalized treatment plan with multi-disciplinary considerations should be given for these patients. The pathogenesis remains unclear but may be related to genetic as well as environmental factors. More studies are urgently needed to explore the pathogenesis and treatment options for the future.

Dental caries and hypoplastic amelogenesis imperfecta: Clinical, structural, biochemical and molecular approaches.

AIM: The aim of this study was to explore the caries features in hypoplastic Amelogenesis Imperfecta (AI) patients. MATERIALS AND METHODS: A cross-sectional study was performed including 28 patients, 14 with hypoplastic AI and 14 controls for whom Decayed (D), Missed (M) and Filled (F) Teeth (T) were checked for a DMFT index evaluation. Twenty-eight saliva samples, 4 bacterial plaques and 19 teeth were used. Decayed teeth were observed under polarized light and scanning electron microscopy. Salivary pH was measured and saliva bacterial strains were biochemically identified and confirmed by PCR. Bacterial adhesions to tooth surfaces were observed by Scanning Electron Microscopy (SEM) and evaluated by colony enumeration after in vitro culture of Streptococcus mutans and Lactobacillus casei with dental fragments. RESULTS: DMFT indexes were significantly lower in AI patients (mean DMFT = 0.8) compared to controls (mean DMFT = 2.9). Decayed teeth revealed sclerotic, demineralized, invaded and disintegrated zones in dentine. Dental plaques were rich with filamentous bacteria in AI patients. Oral microbiotome of the saliva showed a low rate of Streptococci and a significant high level of Bacillus spp, Enterococcus faecalis and Enterococcus faecium in AI patients. In vitro study showed a significant high adhesion of Lactobacillus casei and a weak adhesion of Streptococcus mutans on AI dental hard tissues. CONCLUSION: Our study showed that hypoplastic AI patients have (i) a low DMFT index, (ii) an alkaline pH of saliva enriched with Bacillus spp, Enterococcus faecalis and Enterococcus faecium and (iii) dental tissues more easily invaded by Lactobacilli than Streptococci. The combination of these bacteria seems to give AI patients protection against dental caries.

Crown therapy in young individuals with amelogenesis imperfecta: Long term follow-up of a randomized controlled trial.

OBJECTIVES: Amelogenesis imperfecta (AI) is a rare, genetically determined defect in enamel mineralization. Several problems are associated with AI: hypersensitivity, wear, restorations requiring replacement, gingivitis, aesthetic problems, and social avoidance. We conducted a randomized controlled trial of crown therapy in young individuals with AI showing excellent results. This study reports results from a long-term-follow-up with focus on quality, longevity and adverse events. METHODS: The RCT included 27 patients (aged 11-22 years) with severe AI in need of crown therapy and used a split-mouth technique. After placing 119 Procera® crowns and 108 IPS e.max Press crowns following randomization, we assessed longevity, quality, adverse events, and tooth sensitivity and calculated survival rates and success rates. RESULTS: We followed the original 227 crowns for 4.3-7.4 years (mean 5.5 ±â€¯0.8). In all, 79% (193) crowns were followed for at least 5 years. The survival rate was 99.6% and the success rate, 94.7%; 95% of the crowns had excellent or acceptable quality. Due to suboptimal marginal integrity, 4% of the crowns required adjustment. Sensitivity problems decreased after crown therapy (p < 0.001). All adverse events occurred in patients aged 19-23 years and involved apical periodontitis (3% of teeth); all but two events were related to dental trauma in the actual tooth. CONCLUSIONS: Ceramic crown therapy in adolescents and young adults with severe forms of AI show excellent survival and success rates and longevity with few adverse events. CLINICAL SIGNIFICANCE: Ceramic crown therapy can be recommended for adolescents and young adults with severe forms of amelogenesis imperfecta.

Ophthalmic manifestations of Heimler syndrome due to PEX6 mutations.

BACKGROUND/AIMS: Pigmentary retinal dystrophy and macular dystrophy have been previously reported in Heimler syndrome due to mutations in PEX1. Here we reported the ocular manifestations in Heimler syndrome due to mutations in PEX6. MATERIALS AND METHODS: Medical records were reviewed to identify patient demographics, ophthalmic and systemic findings, and results of diagnostic testing including whole genome sequencing. RESULTS: Patient 1 is 12-year-old boy with a novel mutation c.275T>G (p.Val92Gly) and known mutation c.1802G>A (p.Arg601Gln) in PEX6. Patient 2 is a 7-year-old girl with the same known c.1802G>A (p.Arg601Gln) mutation and another novel missense mutation c.296G>T (p.Arg99Leu). Both patients exhibited a pigmentary retinopathy. Visual acuity in patient 1 was 20/80 and 20/25 following treatment of intraretinal cystoid spaces with carbonic anhydrase inhibitors, while patient 2 had visual acuity of 20/20 in both eyes without intraretinal cysts. Fundus autofluorescence showed a multitude of hyperfluorescent deposits in the paramacular area of both eyes. OCTs revealed significant depletion of photoreceptors in both patients and macular intraretinal cystoid spaces in one patient. Full field electroretinograms showed normal or abnormal photopic but normal scotopic responses. Multifocal electroretinograms were abnormal. CONCLUSIONS: Heimler syndrome due to biallelic PEX6 mutations demonstrates a macular dystrophy with characteristic fundus autofluorescence and may be complicated by intraretinal cystoid spaces.

Complete rehabilitation of compromised full dentitions with adhesively bonded all-ceramic single-tooth restorations: Long-term outcome in patients with and without amelogenesis imperfecta.

OBJECTIVES: This clinical follow-up evaluated the long-term outcome of full-mouth rehabilitations with adhesively bonded all-ceramic restorations in patients suffering from amelogenesis imperfecta (AI) or affected by extensive tooth wear including a loss of the vertical dimension of occlusion. MATERIALS AND METHODS: Included for evaluation were all patients treated with adhesively bonded monolithic single-tooth restorations made of silicate or lithium disilicate ceramics; allowing a maximum four missing teeth and a facial feldspathic veneering of LDS anterior crowns. After treatment, patients have been enrolled in a recall program for dental check-ups including quality assessment of the restorations. Patients answered the oral health impact profile (OHIP-14) at their last visit. RESULTS: Seventeen patients (mean age = 35 ±â€¯18 years) were observed up to 16.5 years (mean: 6.2 ±â€¯3.8 years). 12 out of 450 restorations failed due to core fracture (n = 7), tooth fracture (n = 2), one secondary caries, one chip-off grade 3, and one fixed dental prosthesis due to discomfort. The overall mean survival rate of the single-tooth restorations was estimated 99.4% at 5 and 91.4% at 10 years. The overall mean success rate was estimated 92.6% at 5 and 81.4% at 10 years, mainly due to chip-offs and crack formation (27 out of 31 relative failures). The mean annual failure rates (AFR) range between 1.5 and 2% over the years, but non-AI patients were affected more frequently by early technical complications in the facial veneering of anteriors, resulting in an AFR ranging between 5.2 and 4%. Quality assessment revealed stable color, form and marginal integrity in all patients up to ten years. The distribution of OHIP values is comparable to the representative sample of healthy patients. CONCLUSION: Adhesively bonded single-tooth restorations provided a high clinical quality in the long-run. However, while the survival and success were excellent in AI patients, restorations in non-AI patients were affected by a higher complication rate, likely related to a higher risk profile due to a history of bruxism and tooth wear.