Retrospective Study of Root Canal Configurations of Mandibular Third Molars Using CBCT- Part-II.

INTRODUCTION: Abnormal root canal morphologies of third molars can be diagnostically and technically challenging during root canal treatment. AIM: The aim of this retrospective study was to investigate the root and canal morphology of mandibular third molars in Central India population by using Cone Beam Computed Tomography (CBCT) analysis. MATERIALS AND METHODS: CBCT images of 171 mandibular third molars were observed and data regarding number of roots, number of canals, Vertucci's classification in each root, prevalence of C shaped canal, gender and topographical relation of morphology in mandibular third molar was statistically evaluated. RESULTS: Majority of mandibular third molars had two roots (84.2%) and three canals (64.3%). Most mesial root had Vertucci Type II (55.6%) and Vertucci Type IV (22.2%), distal root had Type I canals (87.5%). Over all prevalence of C shaped canals in mandibular third molars was 9.4%. CONCLUSION: There was a high prevalence of two rooted mandibular third molars with three canals.

Prevalence of C-shaped canals in mandibular second and third molars in a central India population: A cone beam computed tomography analysis.

INTRODUCTION: To evaluate the prevalence of C-shaped root canals in mandibular molars using cone beam computed tomography (CBCT) in a subpopulation of Central India. MATERIALS AND METHODS: CBCT scans of patients from diagnostic imaging center were selected in accordance with the criteria given by Fan et al. (2004) for C-shaped canals. A total of 238 CBCT scans fulfilled the inclusion criteria and thereby divided into two groups: Group 1: Images showing C-shaped canal configuration in mandibular second molars. Group 2: Images showing C-shaped canal configuration in mandibular third molars. The frequency and distribution of canals and their configuration along with the position of lingual/buccal grooves in the images were evaluated, and the data was analyzed. RESULTS: CBCT evaluation showed that 9.7% of second molars and 8% of third molars had C-shaped canals. A prominent buccal groove was seen in these teeth. The data showed a significant difference (P = 0.038) for the presence of such anatomy on the right side for mandibular third molars. CONCLUSION: The study showed a significant prevalence of C-shaped canal configuration in the subpopulation studied.

Retrospective study of root canal configurations of maxillary third molars in Central India population using cone beam computed tomography Part- I.

OBJECTIVE: The aim of this study was to investigate the root and canal morphology of maxillary third molars in Central India population using cone-beam computed tomography (CBCT) analysis. MATERIALS AND METHODS: CBCT images of 116 maxillary third molars were observed, and data regarding the number of roots, the number of canals, and Vertucci's Classification in each root was statistically evaluated. RESULTS: Majority of Maxillary third molars had three roots (55.2%) and three canals (37.9%). Most MB root (43.8%), DB root (87.5%), and palatal root (100%) of maxillary third molars had Vertucci Type I. Mesiobuccal root of three-rooted maxillary third molars had Vertucci Type I (43.8%) and Type IV (40.6%) configuration. Overall prevalence of C-shaped canals in maxillary third molars was 3.4%. CONCLUSION: There was a high prevalence of three-rooted maxillary molars with three canals.

Comparative evaluation of microtensile bond strength of different solvent based one step and two step adhesive systems to dentin. An in-vitro study.

AIM AND OBJECTIVE: To compare and evaluate the micro tensile bond strength of different solvent based one step and two step adhesive systems to dentin. MATERIALS AND METHODS: Sixty recently extracted human mandibular premolars were subjected for the study and divided into 4 groups of fifteen each. The adhesive materials Single Bond, Prime and Bond XP, Clearfil S3 Bond and G-Bond were applied to flat dentin surfaces according to the manufacturer's instructions. After resin composite build up, teeth were sectioned to obtain beams with an approximate cross sectional area of 2 mm(2) and stressed to failure. Data were analysed statistically by ANOVA and student Neuman Keuls multiple comparison tests. RESULTS: The study demonstrated that Single Bond has better bond strength to dentin compared to the other adhesive systems. CONCLUSION: Ethanol and water based two-step adhesive Single Bond exhibited significantly higher microtensile bond strength values to dentin among all the adhesive systems tested.