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Prosthodontics
Can different etching protocols change the properties of a hybrid ceramic?
Jean Soares Miranda
Jaiane Bandoli Monteiro
Pollyanna Nogueira Ferreira Silva
Márcia Carneiro Valera
Eduardo Bresciani
Renata Marques de Melo
The aim of this study was to evaluate the effects of different concentrations of hydrofluoric acid (HF) and etching times on the flexural strength, roughness, wettability, and type of failure of a hybrid ceramic. Blocks of the ceramic material were randomly divided into 7 groups (n = 13): a control group (no treatment) as well as experimental groups etched with 5% or 10% HF for 30, 60, or 90 seconds. Biaxial flexural test results indicated a statistically significant reduction in the resistance of the ceramic when conditioned with 10% acid (P < 0.01). Surface analyses revealed that the higher the concentration of the acid, the lower the wettability of the ceramic (P < 0.01). Based on these results, a 5% HF concentration is best indicated for the surface treatment of VITA ENAMIC.
2020 March/April; 68(2):20-25.
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Periodontics
VISTA technique in combination with chorionic allograft for gingival recession coverage: a case series
Rajendran Poornima
Kukkamalla Meena Anand
Subraya Bhat
Kalyan Chakravarthy Pentapati
Pratibha Gopalkrishna
The vestibular incision subperiosteal tunnel access (VISTA) technique, a minimally invasive procedure, achieves multitooth recession coverage with a single access incision. The present case series aimed to provide information regarding the potential advantage of placing a chorionic membrane in combination with the VISTA technique to achieve recession coverage. The VISTA technique provided good results in terms of recession coverage. Although there was an improvement in the gingival biotype, the placement of a chorionic membrane did not provide any advantage in terms of percentage of root coverage.
2020 March/April; 68(2):26-29.
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Basic Science
Signs of the proximity of third molar roots to the mandibular canal: an observational study in panoramic radiographs
Jhonatan Thiago Lacerda-Santos
Gélica Lima Granja
Maria Helena Chaves de Vasconcelos Catão
Flaviano Falcão de Araújo
George Borja de Freitas
José Cadmo Wanderley Peregrino de Araújo-Filho
Julliana Cariry Palhano Freire
Eduardo Dias-Ribeiro
Jalber Almeida dos Santos
A study of panoramic radiographs found that the tooth positions most frequently associated with proximity between the third molar and the mandibular canal were position C (highest point of the third molar located at or below the cervical margin of the second molar) and the mesioangular position (long axis of the third molar angled mesially toward the second molar). A proximity between the third molar and mandibular canal was found significantly more frequently in female patients and in patients aged 24 years and younger (P < 0.001).
2020 March/April; 68(2):30-35.
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Periodontics
Topical tetracycline in the treatment of a 7-year-old child with necrotizing ulcerative gingivitis: a case report
Brunno Santos de Freitas Silva
Simone Sousa Silva Sant’Ana
Mário Serra Ferreira
Wilson José Mariano-Júnior
Satiro Watanabe
Fernanda Paula Yamamoto-Silva
An aggressive case of necrotizing ulcerative gingivitis in a pediatric patient was treated with a topical solution of tetracycline. Complete remission of the lesions was observed within 14 days of initial treatment.
2020 March/April; 68(2):36-38.
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SELF-INSTRUCTION
Basic Science
Bilateral presentation of different supernumerary teeth in nonsyndromic patients: case reports
Anuj Jain
Saumya Taneja
Bilateral occurrence of supernumerary teeth is rare. When supernumerary teeth do occur bilaterally, they are most often associated with a syndrome. This article presents case reports of 4 nonsyndromic patients with different forms of bilateral supernumerary teeth: mesiodentes, paramolars, distomolars, and parapremolars.
2020 March/April; 68(2):39-42.
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Self-Instruction Exercise No. GD453
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Basic Science
Degree of conversion of resin cements polymerized under different ceramic systems
Márcio Leandro Von Dreifus Marinho
Henrico Badaoui Strazzi Sahyon
João Carlos Silos Moraes
Wirley Gonçalves Assunção
Paulo Henrique dos Santos
This study evaluated the degree of conversion of resin cements polymerized under 5 ceramic systems. The findings showed that RelyX ARC resin cement displayed a higher degree of conversion than Maxcem Elite. For both cements, the degree of conversion increased gradually up to 24 hours after curing. The ceramic system used directly influenced the degree of conversion of RelyX ARC but not of Maxcem Elite.
2020 March/April; 68(2):44-49.
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SELF-INSTRUCTION
Oral Medicine, Oral Diagnosis, Oral Pathology
Erythema multiforme induced by fluconazole in an immunocompetent patient: a case report and review of the literature
Vanessa Silvestre de Aquino da Silva
Alice Engel Naves Freire
Noé Vital Ribeiro Junior
Felipe Fornias Sperandio
Marina Lara de Carli
João Adolfo Costa Hanemann
Erythema multiforme is an acute hypersensitivity reaction that affects the skin and/or mucosa. This report describes the rare case of an immunocompetent patient with erythema multiforme induced by fluconazole. The patient’s use of the antifungal medication was immediately discontinued, and the hypersensitivity reaction was treated successfully with a single intramuscular dose of betamethasone. A literature review of similar cases is presented to aid in the diagnosis of severe adverse reactions to fluconazole.
2020 March/April; 68(2):50-54.
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Self-Instruction Exercise No. GD454
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Esthetics
Esthetic reconstruction of teeth with enamel hypoplasia
Mônica Irma Aparecida Valdeci de Souza
Jéssica Patrícia Cavalheiro
Diego Girotto Bussaneli
Fabiano Jeremias
Ângela Cristina Cilense Zuanon
Enamel hypoplasia in the maxillary incisors was successfully treated with composite resin restorations placed with the aid of a direct silicone palatal guide, restoring function and esthetics in a pediatric patient.
2020 March/April; 68(2):56-59.
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SELF-INSTRUCTION
Occlusion
Comparison of bite force on the dominant and nondominant sides of patients with habitual unilateral chewing: a pilot study
Sulthan Ibrahim Raja Khan
Dinesh Rao
Anupama Ramachandran
Baskaran Veni Ashok
The present study aimed to record the difference in bite force between the dominant and nondominant chewing sides of patients with a chewing-side preference. The maximal voluntary bite force (MVBF) of 95 adults was recorded and compared in pairs (dominant vs nondominant side; men vs women; and age < 30 vs ≥ 30 years) with independent-samples t tests. The mean MVBF was significantly greater (P < 0.001) on the dominant chewing side than on the nondominant chewing side in both the male and female groups. The differences between the male and female dominant sides and between the male and female nondominant sides were also statistically significant (P < 0.001). However, there was no statistically significant difference in bite force between the age groups.
2020 March/April; 68(2):60-63.
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Self-Instruction Exercise No. GD455
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Prosthodontics
Effect of radiotherapy on the artificial acrylic resin tooth bond to the acrylic resin denture base
Clóvis Lamartine de Moraes Melo Neto
Léuri Antunes da Silva Dantas
Ana Carolina Pedroni Meyer
Marcos Antonio da Silva
José Octávio Haggi Rodrigues Ferreira
Gabriela Cristina Santin
Sérgio Sábio
This study evaluated the effect of different radiotherapy doses on the bond between acrylic resin teeth and their acrylic resin denture bases and found that a maximum radiation dose of 70 Gy weakened the tooth-base bond.
2020 March/April; 68(2):66-69.
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Endodontics
An alternative 2-step cementation technique to reduce polymerization shrinkage stress in root canals: a case report
Isis Almela Endo Hoshino
Marjorie de Oliveira Gallinari
Sandra Rahal Mestrener
Naiara Reis Gil Anchieta
Rodolfo Bruniera Anchieta
This case report describes a simple 2-step cementation technique to reduce polymerization shrinkage of the resin cement and improve the fit of the fiber-reinforced post inside the root canal.
2020 March/April; 68(2):70-72.
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Basic Science
Relationship of maxillary posterior roots to the maxillary sinus and cortical bone: a cone beam computed tomographic study
Lívia Machado Lima Makris
Karina Lopes Devito
Paulo Sérgio dos Santos D’Addazio
Carolina Oliveira de Lima
Celso Neiva Campos
This study evaluated the relationship between the apices of maxillary posterior teeth (second premolar, first molar, and second molar) and the maxillary sinus floor (MSF) and maxillary cortical bone (MCB). Cone beam computed tomographic (CBCT) scanning was used to analyze 1660 roots from 678 teeth and determine the shortest distance between the root apex and MSF and between the root apex and buccal and palatal cortices of maxillary bone. The root apices were classified based on their relationship to the MSF: type 1, the root apex protruded into the maxillary sinus; type 2, the root apex was from 0 mm (touching the MSF) to 1 mm below the MSF; and type 3, the root apex was greater than 1 mm below the MSF. As the age of the subjects increased (older than 40 years), there was a significantly greater proximity of the teeth to the MCB (P < 0.05) and less proximity of second molars to the MSF (P = 0.005). First and second molars each presented a high prevalence of root apices that protruded into the maxillary sinus (type 1), 47.8% and 43.8%, respectively. Second premolars were more frequently classified as type 3 (71.7%) than first and second molars. The mesiobuccal root of the maxillary second molar was the root closest to the MSF, while the maxillary first molar was the tooth closest to the MCB.
2020 March/April; 68(2):e1-e4.
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