Malocclusion affecting the production of sibilant sounds

 # The production of sibilant sounds (e.g., 's', 'z') is most commonly affected by which two concurrent malocclusion features due to uncontrolled air escape and altered tongue positioning?

A. Unilateral Posterior Crossbite and Midline Discrepancy

B. Severe Mandibular Crowding and Deep Overbite

C. Excessive Overjet and Anterior Open Bite

D. Class III Malocclusion and Edge-to-Edge Incisors

The correct answer is: C. Excessive Overjet and Anterior Open Bite

Sibilant sounds like 's' and 'z' rely on precise airflow through a narrow tongue-to-palate groove, and disruptions from excessive overjet (protruding upper incisors) alter tongue positioning, while anterior open bite allows uncontrolled air escape through the anterior gap, often causing lisps or distortions. Studies confirm this combination's strong impact on sibilants, unlike the other options, which less directly affect anterior airflow or tongue placement for these sounds.

Severe, localized pathologic attrition on the palatal surfaces of maxillary incisors and the incisal edges of mandibular incisors is most commonly pathognomonic of which specific malocclusion?

 # Severe, localized pathologic attrition on the palatal surfaces of maxillary incisors and the incisal edges of mandibular incisors is most commonly pathognomonic of which specific malocclusion?

A. Severe Anterior Open Bite

B. Class II Division 2 Malocclusion (Deep Bite)

C. Unilateral Posterior Crossbite with functional shift

D. Class I Malocclusion with severe posterior crowding

The correct answer is: B. Class II Division 2 Malocclusion (Deep Bite)

This wear pattern—severe, localized pathologic attrition on the palatal surfaces of the maxillary incisors and the incisal edges of the mandibular incisors—is pathognomonic for Class II Division 2 malocclusion, which features retroclined maxillary central incisors and a deep overbite. In this condition, the mandibular incisors contact the lingual (palatal) aspects of the maxillary incisors during occlusion, leading to friction and progressive enamel loss at these sites over time. This contrasts with the other options: anterior open bite reduces incisal contact, unilateral posterior crossbite primarily affects lateral segments, and Class I with posterior crowding does not typically produce this anterior-specific lingual wear.

Accommodation Options for Delegates Attending the 16th International Conference of ODOAN, Dharan, Nepal

Our Conference venue is White Elegance Palace, Dharan. 

Stay comfortably close to the venue! Here are our recommended hotels for your convenience:

1. Hotel Brick

• Address: Sainik Chowk, Dharan, Sunsari, Nepal
• Phone: +977 9769703533
• Distance: 1 Kilometer
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

2. Hotel Meriken

• Address: Dharan-15, Ramlaxman Marga, Dharan, Sunsari, Nepal
• Phone: +977 9761003570
• Distance: 2.6 Kilometer
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

3. Hotel Star Purwi

• Address: Chatara Line, Dharan, Sunsari, Nepal
• Phone: +977 9817302498 / +977 9840070025
• Distance: 750 meters
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

Non AC Single @ Rs. 1600

AC Twin Double @ Rs. 2500

AC Deluxe Tripe Sharing @ Rs. 2500

AC Deluxe Master Bedrooms @ Rs. 2200

4. New Dreamland Hotel & Lodge

• Address: Dhankute Road, Dharan, Sunsari, Nepal
• Phone: +977 25 525024, +977 25 575024, +977 25 575300
• Distance: 1 Kilometer
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

5. Hotel Gorkha

• Address: Chatara Line, Dharan, Sunsari, Nepal
• Phone: +977 25 582311 / +977 9801355198
• Distance: 450 meters
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

6. Hotel Gajur Palace

• Address: Bhotepul, Dharan, Sunsari, Nepal
• Phone: +977 9805338898
• Distance: 2.3 Kilometer
• CLICK HERE TO VIEW REVIEWS ON GOOGLE

The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and the Index of Orthodontic Treatment Need (IOTN) are both used to assess treatment need. Which component of the IOTN is most directly correlated with the patient-reported concerns measured by the PIDAQ?

 The Psychosocial Impact of Dental Aesthetics Questionnaire (PIDAQ) and the Index of Orthodontic Treatment Need (IOTN) are both used to assess treatment need. Which component of the IOTN is most directly correlated with the patient-reported concerns measured by the PIDAQ?

A. The Treatment Complexity Index (TCI)

B. The Aesthetic Component (AC)

C. The Dental Health Component (DHC)

D. The Peer Assessment Rating (PAR) Index 

The correct answer is B. The Aesthetic Component (AC)

The PIDAQ assesses patient-reported psychosocial impacts (e.g., psychological, social, and aesthetic self-consciousness) stemming from perceived dental aesthetics, making it a subjective, condition-specific OHRQoL tool. The IOTN's Aesthetic Component (AC) directly evaluates subjective aesthetic impairment via a 10-point visual scale of anterior teeth appearance (clinician-rated but perception-based), aligning closely with PIDAQ's focus on self-perceived concerns. Validation studies consistently use AC for convergent validity of PIDAQ, showing significant correlations (e.g., Spearman's ρ = 0.389, p < 0.001 in Sahoo et al., 2025; p < 0.001 in multiple adaptations like Persian, Swedish, and Indian versions). PIDAQ scores discriminate across AC grades, with higher AC scores (worse aesthetics) linked to elevated psychosocial impacts.

In contrast, the Dental Health Component (DHC) measures objective malocclusion severity for health risks, showing correlations (e.g., r = 0.72, p < 0.01 in Brown & Moerenhout, 2016) but indirectly via aesthetic proxies in severe cases. TCI and PAR are unrelated (TCI from complexity indices; PAR for malocclusion quantification). Thus, AC provides the most direct link to PIDAQ's patient-centered aesthetic concerns.