Management of short clinical crowns by utilizing horizontal groove retentive technique in crown/tooth or both with different luting cements - An analysis on extracted teeth.

PURPOSE: The aim of the present study was to compare and evaluate the retention of dislodged crowns by addition of one horizontal circumferential groove (HCG) to preparation and/or casting and with two luting cements. MATERIALS AND METHODS: A total of 80 recently extracted human maxillary first molar teeth of appropriate sizes were collected and mounted in the resin blocks using surveyor. Standardized full coverage tooth preparations were prepared and impressions were obtained. Dies were prepared for casting and were then subjected to tensile loading using UTM. The data obtained was statistically analyzed. RESULTS: Obtained values were statistically analyzed using ANOVA, STUDENT "t" TEST and BONFERRONI TEST. The results showed that the mean tensile force (TF) was in the range from 49.05 to 264.87 for group A and 255.06 to 588.60 for group B. The highest TF was recorded for subgroup 3B, whereas the lowest for subgroup 1A. CONCLUSION: Within the limitations of the study, it was concluded that by addition of one HCG to tooth preparation or casting and to both showed significant increase in retention, when compared to control groups. The highest retention value was obtained for sample with groove on the internal surface of crown luted with SARC.

Evaluation of esthetics of incisor position in relation to incisive papilla to replicate in the denture prosthesis.

BACKGROUND: The distance between the central incisor to incisive papilla (CI-IP) is constant and regarded as one of the landmarks for the placement of artificial teeth in the prosthesis. Earlier studies were done in relation to anterior border of papilla but after extraction the incisive papilla recedes changing the position of anterior border. MATERIALS AND METHODS: In this study, 100 dentulous subjects were divided into two groups (males and females) with 50 in each group. Maxillary alginate impressions were made and base poured using levelling instrument to standardize all casts and surveyed on the surveyor for uniformity of the casts. The measured distances were analyzed using Student t-test analysis. RESULTS: The ovoid arch was the commonest arch form found in both males and females with slightly more prevalent in females. Analysis was done using Student t-test analysis and found that the mean distance from CI-IP was found to be at 12.85 mm and 12.39 mm in males and females, respectively. CONCLUSION: When square arch form (both male and female) mean CI-IP was compared with the total sample mean CI-IP, the mean CI-IP of square arch form was less than that of total sample with greater significance (P < 0.05). When ovoid arch form (both male and female) mean CI-IP was compared with the square arch form (both male and female) mean CI-IP, the mean CI-IP of ovoid arch form was greater than that of square arch form with greatest significance (P = 0).

Customized nasal prosthesis in continuous positive airway pressure treatment, current trend in treating obstructive sleep apnea for better patient compliance.

Snoring is common disorder in India, which is caused due to obstructive sleep apnea. Nasal continuous positive airway pressure (CPAP) is an effective treatment for this condition. Prefabricated nasal masks lack intimate adaptation and cause air leakage producing discomfort for patient and decrease the compliance for treatment. This article describes a simple method for customizing nasal CPAP mask and fabrication using maxillofacial prosthodontic laboratory techniques currently available.