Prosthetic Rehabilitation of a Hemisected Maxillary Molar: A Rare Entity

Gingival recession beyond grade III and grade IV level involving furcation defects can lead to tooth loss if not intervened at appropriate time. The treatment options include scaling and root planing, Furcation-plasty, Tunnel preparation, Root separation and resection. The chief complaint of the patient was pain in the upper left first molar because of grade III furcation involvement. Since it was a four rooted molar, the treatment of choice was hemisection of the tooth and extraction of the distal half following endodontic treatment. As the second molar was mesially tilted the prosthodontic rehabilitation was done with a hybrid prosthesis involving a full coverage conventional porcelain fused to metal retainer on the hemisected molar and a resin bonded partial coverage retainer on the tilted second molar. The resultant prosthesis is termed as "Hybrid prosthesis".     

Buccal Injection of 2% Lidocaine With Epinephrine for the Removal of Maxillary Third Molars

The aim of the study was to demonstrate if 2% lidocaine hydrochloride with 1 : 200,000 epinephrine could provide palatal anesthesia in maxillary tooth removal with a single buccal injection. The subjects included in the clinical study were those requiring extraction of the maxillary third molar of either side. For the purpose of comparison, the sample was randomly divided into 2 main groups: group 1 (study group) included 100 subjects who were to receive a single injection before extraction, and group 2 (control group) included 100 subjects who were to receive a single buccal injection and a single palatal injection before extraction. After 5 minutes the extraction was performed. All patients were observed for Faces Pain Scale during extraction and asked for the same on a 100-mm visual analog scale after extraction. According to visual analog scale and Faces Pain Scale scores, when maxillary third molar removal without palatal injection (study group) and with palatal injection (control group) were compared the difference was not statistically significant (P > .05). Removal of maxillary third molars without palatal injection is possible by depositing 2 mL of 2% lidocaine hydrochloride with 1 : 200,000 epinephrine to the buccal vestibule of the tooth.Key Words: Maxillary third molar, Lidocaine hydrochloride with 1 : 200,000 epinephrine single buccal injection, Local anesthesiaAchieving excellent local anesthesia is the key to many dental treatments. Pain-free operating is an added benefit to the patient but also helps the operator to treat the patient in a calm, unhurried fashion.¹ The removal of maxillary third molars is one of the most frequently performed procedures by dental surgeons. Indications for removal include common pathological conditions such as caries, buccal eruption with food impaction or cheek biting, and recurrent pericoronitis.²According to the literature, for the removal of maxillary third molars, anesthetic solution should be administered as either a greater palatine nerve block or local palatal infiltration plus either a posterior alveolar nerve block or a buccal infiltration.³ Palatal injections are frequently associated with some level of discomfort due to strong attachment of palatal mucosa to the bone and dense innervation of the palatal mucosa. Many studies reported that palatal injections are poorly tolerated by the majority of patients.^3–5Initially there was inadequate evidence in the literature to support maxillary third molar removal with only buccal infiltration of local anesthesia,⁶ but now more studies have evaluated the bucco-palatal diffusion of local anesthesia in extractions with only buccal vestibular anesthesia, without palatal complementation.^7,8Many techniques have been tried to reduce the discomfort of intraoral injections, including transcutaneous electronic nerve stimulation, topical anesthetic application, topical cooling of the palate, computerized injection systems, pressure administration, and eutectic mixture of local anesthetics. Some claim that articaine has a higher potential of diffusibility through soft and hard tissues, precluding palatal injection when maxillary third molars are extracted.^7,9 In a comparative study between articaine and lidocaine, both solutions presented similar behavior and properties.¹⁰The aim of our study was to find out if lidocaine hydrochloride with epinephrine could provide palatal anesthesia in maxillary third molar removal without the need for a palatal injection.     

Lung-enriched Organisms and Aberrant Bacterial and Fungal Respiratory Microbiota after Lung Transplant

Rationale: Long-term survival after lung transplantation is limited by infectious complications and by bronchiolitis obliterans syndrome (BOS), a form of chronic rejection linked in part to microbial triggers. Objectives: To define microbial populations in the respiratory tract of transplant patients comprehensively using unbiased high-density sequencing. Methods: Lung was sampled by bronchoalveolar lavage (BAL) and upper respiratory tract by oropharyngeal wash (OW). Bacterial 16S rDNA and fungal internal transcribed spacer sequencing was used to profile organisms present. Outlier analysis plots defining taxa enriched in lung relative to OW were used to identify bacteria enriched in lung against a background of oropharyngeal carryover. Measurements and Main Results: Lung transplant recipients had higher bacterial burden in BAL than control subjects, frequent appearance of dominant organisms, greater distance between communities in BAL and OW indicating more distinct populations, and decreased respiratory tract microbial richness and diversity. Fungal populations were typically dominated by Candida in both sites or by Aspergillus in BAL but not OW. 16S outlier analysis identified lung-enriched taxa indicating bacteria replicating in the lower respiratory tract. In some cases this confirmed respiratory cultures but in others revealed enrichment by anaerobic organisms or mixed outgrowth of upper respiratory flora and provided quantitative data on relative abundances of bacteria found by culture. Conclusions: Respiratory tract microbial communities in lung transplant recipients differ in structure and composition from healthy subjects. Outlier analysis can identify specific bacteria replicating in lung. These findings provide novel approaches to address the relationship between microbial communities and transplant outcome and aid in assessing lung infections.     

A template free protocol for fabrication of a Ni(ii)-loaded magnetically separable nanoreactor scaffold for confined synthesis of unsymmetrical diaryl sulfides in water

In the present report, an environmentally benign magnetically recoverable nickel(ii)-based nanoreactor as a heterogeneous catalyst has been developed via a template free approach. The catalytic performance of the synthesized catalyst is assessed in the confined oxidative coupling of arenethiols with arylhydrazines to form unsymmetrical diaryl sulfides under aerobic conditions. The salient features of our protocol include oxidant- and ligand-free conditions, use of water as a green solvent, room temperature and formation of nitrogen and water as the only by-products. Moreover, a broad range of functional groups are tolerated well and provide the corresponding diaryl sulfides in moderate to good yields. Moreover, the heterogeneous nature of the catalyst permits facile magnetic recovery and reusability for up to seven runs, making the present protocol highly desirable from industrial and environmental standpoints.

An environmentally benign nickel(ii)-based magnetic nanoreactor has been developed for oxidative coupling of arenethiols with arylhydrazines to form unsymmetrical diaryl sulfides in water at room temperature.