Effect of sandblasting on fracture load of titanium ceramic crowns

Purpose of the Study:

It is difficult to achieve a reliable bond between the titanium and veneering porcelain. The aim of this study was to evaluate the bond strength between titanium ceramic crowns.

Materials and Methods:

The surfaces of titanium copings were divided in two groups. Group A sandblasted with 250 um (n = 10) and Group B without sandblasting (n = 10). Low-fusing porcelain was bonded over copings. A universal testing machine was used to determine the fracture load (N) of the crowns. All data were compared using Student''s t-test.

Results:

There was a significant difference in fracture toughness between two groups (P = 0.05). The mean value of fracture strength for Group A was 721.66 N and for Group B was 396.39 N.

Conclusions:

Sandblasting improves the bond strength between titanium, and ceramic, mechanical bonding plays a crucial role in the bonding between titanium and ceramic.Key Words: Bonding, fracture load, sandblasting, titanium     

Goldenhar Syndrome with Tessier’s 7 Cleft: Report of a Case

Goldenhar syndrome, a variant of hemifacial microsomia, is a well-known developmental anomaly of maxillofacial skeleton that is apparent at birth. The first and second branchial arch involvement during early embryonic development results in a wide spectrum of anomalies that may include macrostomia and lateral facial clefts. Though clefts of the orofacial region are among the most common congenital facial defects, the occurrence of lateral facial clefts (Tessier 7 cleft) in conditions such as the Goldenhar syndrome, is very rare (<5%). The lateral facial cleft, which results because of improper development of the perioral muscles of the face, gives an appearance of macrostomia giving rise to potential psychological, aesthetic and feeding problems. This clinical report describes the closure of a Tessier 7 cleft and the use of distraction osteogenesis to treat mandibular asymmetry in an 11-year-old female patient with Goldenhar’s syndrome.     

The Effect of Alloplastic Bone Graft and Absorbable Gelatin Sponge in Prevention of Periodontal Defects on the Distal Aspect of Mandibular Second Molars,After Surgical Removal of Impacted Mandibular Third Molar: A Comparative Prospective Study

Aim

Recent studies claim that haemostatic agents can be used as bone graft substitutes. The aim of this study was to compare the efficacy of alloplastic bone graft with absorbable gelatin sponge in prevention of periodontal defects distal to mandibular second molar after the surgical removal of impacted mandibular third molars.

Materials and methods

A prospective, randomized, single-blind split-mouth study was designed. The study consisted of 25 patients requiring surgical removal of bilateral impacted mandibular 3rd molars. The surgical sites were randomly divided into 2 groups: group I: G-graft (hydroxyapatite + collagen, study group) and group II: Abgel (absorbable gelatin sponge, control group). Patients were recalled on lst and 7th postoperative days and 3rd and 6th postoperative months. Probing depth, alveolar bone levels and soft tissue wound healing were evaluated. Paired t test was used to compare pre and post-operative alveolar bone levels and probing depth (PD). Wilcoxon signed ranks test was used to compare the wound healing.

Results

The soft tissue wound healing, PD and the distance between the cemento–enamel junction on the distal aspect of mandibular second molar (point A) and the alveolar crest on the distal aspect of the same tooth (point B) were significantly higher in group I as compared to group II.

Conclusion

This study reveals an increase in the alveolar bone level, improvement of PD and better wound healing in group I. Group II subjects required longer healing time than the normal. The authors disagree the claim that the haemostatic agents can be used as bone graft substitutes. However, long-term, multicenter, randomized controlled clinical trials are required.     

Temporomandibular Joint Arthrocentesis for Internal Derangement with Disc Displacement Without Reduction

Temporomandibular joint (TMJ) disc derangement is defined as a malpositioning of the articular disc relative to the condyle and eminence. Arthrocentesis of the TMJ is a minimally invasive chair side procedure for the patients with TMJ internal derangement. This case report presents convincing results to keep arthrocentesis as an imperative procedure to relieve such patients of their acute symptoms. TMJ dynamics has also been discussed for an in-depth understanding of the pathology in cases with internal derangement.     

Kapetansky-Juri Technique to Correct the Whistlers Lip in the Multiple Operated Cleft Patient

Purpose

One of the common sequels of a cleft lip repair may be “whistling lip deformity” but other deformities are also seen particularly in failed or multiple resurgery cases. This retrospective study was carried out to evaluate the usefulness of “Kapetansky-Juri” advancement flap technique to correct such deformities.

Methods

Ten patients of bilateral cleft lip with history of minimum five failed cleft lip surgeries and having residual lip deformity were operated using “Kapetansky-Juri” advancement flap technique and were followed up to minimum 36 months.

Results

All patients showed good tissue fullness and complete correction of the deformity. There was no contracture of surrounding skin or vermilion during follow-up period. In eight patients minimal scar formation was seen while two showed midline scar formation.

Conclusion

No tissue loss due to vascular insufficiency was observed. The technique gives good tissue distribution and minimal surface scar formation.     

Fulminant onset of acute leukemia from normal hematopoiesis within 3 months of follow up for multiple myeloma treated with total therapy protocols

Assiduous surveillance for genetic aberrations is necessary in patients on cytotoxic therapies to detect therapy‐related myeloid neoplasms (t‐MN). Current modalities include metaphase cytogenetics and FISH. Since t‐MN may develop abruptly in cytogenetically normal patients, a discussion exploring additional methods such as SNP‐array and targeted‐deep‐sequencing to detect subchromosomal abnormalities is needed.     

An unusual case of phenotype switch between AML FAB subtypes

Phenotypic switch between any leukemia subtypes is of concern to a treating physician and more so, in acute myelocytic leukemia (AML) as the mechanisms for switch and subsequent chemotherapy regimen to be used remain unclear. AML‐non‐M3 from AML‐M3 subtype needs special mention as this has been unheard off.